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					                 The Belle collaboration




Marko Bračko: News from Belle   Bled workshop 2010, Bled, Slovenia   9
                    Asymmetric-energy e+e– colliders
                                                                2
                                  E CMS ~m 4S  c =10.58 GeV
                      KEKB-2              9.0 GeV e– (HER)
  2.11x10 cm s-1(WR!) 34
                                          3.1 GeV e+ (LER)

8.5 GeV e– (HER)                                     PEP-II
3.5 GeV e+ (LER)
                                         1.21x10 cm-2s-134


   Ratei = Lumi. x σi




Marko Bračko: News from Belle    Bled workshop 2010, Bled, Slovenia   10
                    Asymmetric-energy e+e– colliders
                                                                           2
                                             E CMS ~m 4S  c =10.58 GeV




                                                           :
                                                        0)
                                               y o w :0
                      KEKB-2                         9.0 GeV e– (HER)
  2.11x10 cm s-1(WR!)




                                             or n 9
                      34




                                           st re at
                                                     3.1 GeV e+ (LER)




                                         hi a 0
                                        e es / 3
                                      th ri /06
                                                                PEP-II




                                                ...
8.5 GeV e– (HER)
                                                    1.21x10 cm-2s-134




                                    of cto 10
3.5 GeV e+ (LER)

                                  rt -fa 20
                                pa B s (
   Ratei = Lumi. x σi
                                 ot ew
                                B tn
                                   h
                             t    es
                          La




Marko Bračko: News from Belle               Bled workshop 2010, Bled, Slovenia   11
                 Charmonium(-like) states




Marko Bračko: News from Belle   Bled workshop 2010, Bled, Slovenia   9
                    Standard Charmonium States                                                                   c c
                                                                                             n radial quantum number
                                                                          n(2S+1)LJ
                                                                                             S total quark-antiquark spin
                                                                                   cc        L relative orbital ang. mom.
                                                                                             (L = 0, 1, 2 ... S,P,D states)
                                                                                             J=S+L
            c"           (3S)
                               c0'  c1'             c2'                                   P = (–1)L+1 parity
                                                             2      3                      C = (–1)L+S charge conjugation
                     hc'                                                                    MD+MD*=3871.8 MeV/c2
                                "             c2
                                                     open-charm threshold                   2MD
                                 '
            c'                                       c2                                   Below the DD threshold:
                      hc                      c1
                                       c0                                                   States are narrow
                                                                                             All states observed
                                                     black: measurements                             well measured
                           J/
                                                     blue: predictions                               recently observed
                     c



Marko Bračko: News from Belle                                     Bled workshop 2010, Bled, Slovenia                          22
                    Standard Charmonium States                                                                c c
                                                                                          n radial quantum number
                                                                       n(2S+1)LJ
                                                                                          S total quark-antiquark spin
                           5    )                                               cc        L relative orbital ang. mom.
                        41
                  (4                                                                     (L = 0, 1, 2 ... S,P,D states)
                           )
                       60                                                                 J=S+L
            c"  ( 4 1(3S)
                            )
                        4 0  c0'  c1'     ' c2'                                        P = (–1)L+1 parity
                  (40                   c2       2             3                      C = (–1)L+S charge conjugation
                     hc'
                               0)
                              7"
                                                                                         MD+MD*=3871.8 MeV/c2
                      (37
                                                  c2
                                                       open-charm threshold             2MD
                                    '
            c'                                          c2                             Above the DD threshold:
                        hc                       c1
                                          c0                                             States expected to be wide
                                                                                          Only five states measured
                                                        black: measurements                  and identified
                             J/
                                                        blue: predictions                  Many candidates available
                     c



Marko Bračko: News from Belle                                  Bled workshop 2010, Bled, Slovenia                          23
                  Exotic Charmonium-like States
Multiquark states
                                                π   c         Exotic states:
●   Molecular states                        c           u
                                                     Are not forbidden in SM;
      Loosely bound pair of charm mesons u
                                                     Have exotic JPC
      (q,g/pion exchange at short/long distances)
● Tetraquarks
                                                         (0+-, 1-+, 2+-,... forbidden for qq);
                                               u c   exotic decay modes
    Tightly bound diquark-diantiquark states c u
                                                         (not possible for qq);
                                                     strange properties (widths,...);
Charmonium hybrid states                         c
                                                   c
                                                     Multiquark states could also have
    States with excited gluonic degrees of freedom g     non-zero charge [cucd],
                                                         strangeness [cdcs]
Hadro-Charmonium                                         or both [cucs]
    Compact charmonium states bound inside light hadronic matter


Threshold-effects
      Virtual states at the threshold
      Charmonium states with shifted masses due to nearby D(*)D(*) thresholds

Mixture of the above or something even more exotic?
Marko Bračko: News from Belle              Bled workshop 2010, Bled, Slovenia                24
                … and many candidates (X, Y, Z)




     S. L. Olsen @ PANIC 2008, Eilat, Israel, 9-14 Nov, 2008 (arXiv:0901.2371v1[hep-ex])
Marko Bračko: News from Belle             Bled workshop 2010, Bled, Slovenia               25
                … and many candidates (X, Y, Z)




                         Only some of these states will
                                be mentioned.




     S. L. Olsen @ PANIC 2008, Eilat, Israel, 9-14 Nov, 2008 (arXiv:0901.2371v1[hep-ex])
Marko Bračko: News from Belle             Bled workshop 2010, Bled, Slovenia               26
                     cc[-like] production at B-factories
Colour-suppressed B decays:                          Two-photon production:
  e.g. B→Xcc K(*)                                      e+e-→e+e-**→e+e-Xcc
              V *b
                c
                                                             e+                               e+
       b                        c
                                c
                                    X cc                                      *
 B               W                                                                      Xcc
                        V cs
                                s K
                                       *                                    *
     u ,d                       u ,d
                                                              e-                              e-
     0- + , 1- - , 1+ +                                    0- + , 0+ + , 2+ +
Double cc production:                                e+e- radiative return (ISR):
  e.g. e+e- → J/ Xcc                                  e.g. e+e-→ ISR Xcc→ ISR
                                                                       ISR
      e-                        c J/                         e   -
                                c                                                                  
                      *                                                           *
                                                                                        Xcc            
                                c
      e+                        c Xcc                                                              
                                                              e+
            states with C=+                                    1- - only
Marko Bračko: News from Belle                 Bled workshop 2010, Bled, Slovenia                           21
                   The “good old” X(3872): discovery
●Observed first by Belle in 2003:                                                            Belle : 152M BB
                     X(3872)                                ’=(2S)                         PRL 91, 262001 (2003)
B → K  J/ψ
 ±    ±  +    -


                                ℓ+ ℓ-
                                                              (36 ± 7) events
    M = (3871.9 ± 0.5) MeV/c      2
                                                                  (~10)
    Г < 2.3 MeV @ 90% C.L.
                                                                           X(3872)
    BR(B →XK )xBR(X→J/ψ π π )
         -     -                      +   -

                 = (1.3 ± 0.3)x10-5
                                                       M( +  - ℓ+ ℓ-)- M(ℓ+ ℓ-)
●   Confirmed soon by:
                         pp→X(3872) + anything
                                                                        PRD71,071103R(2005) PRD73,011101R(2006)
       PRL 93,072001 (2004)                   PRL 93,162002 (2004)




                                                                                          B decays
Marko Bračko: News from Belle                        Bled workshop 2010, Bled, Slovenia                              13
                                       Trying to understand X(3872)
PRL103, 152001 (2009)




                                                                                    arXiv:0809.1224
                            2.4 fb-1                      B→X(3872)K

                                                          657M BB
                                                                                                      The most precise x(3872) mass
                                                                                                             measurements

                                 M(J/ψπ+π-)
                                                                M(J/ψπ+π-)                                        PRD81, 031103 (2010)
  Mode Mass [ MeV ]                                 Close to D0D*0 threshold: B → D 0 D *0 K                               D*→Dγ
 X  3872   J / ψ ππ Belle 3871 . 46±0 .37±0 . 07
                                                    MX – M(D0D*0) <= 1MeV/c2
 X  3872   J/ ψ ππ CDF 3871. 61±0 .16±0 .19
 M D +M D 3871. 8±0 . 4 0   ∗0

                                                      2
       X  3872  D0 D ∗0 Belle 3872 . 9 0 .. 6 0..5
                                          −0 4 −0
       X  3872  D0 D ∗0 BaBar 3875 .1 0. 7 ±0 .5
                                         −0. 5                                                                             D*→D0π0

                                                                                                                              657M BB
X(3872) mass suggests D0D*0 bound state interpretation
  Molecular (below threshold) or
      virtual (above threshold)?
  Line-shape crucial to distuinguish                                                                                 M(D0D*0)
                                      BR( X → D D )
                                              0 *0
                                                       ≈ 10
Bound state scenario is supported by: BR( X → J ψ π π)
Marko Bračko: News from Belle                                       Bled workshop 2010, Bled, Slovenia                                   12
                       Trying to understand X(3872)
●   CDF angular analysis favours 1++ or 2-+                                          PRL98, 132002 (2007)




                                                                                     0++
                                                                                     1++
●   From M(π π ): clustering on high end
               +   -
                                                                                     1--
      X(3872) → J/ψ ρ (S or P wave) (J = 1 or 2)
                                                                                     2-+
                                    hep-ex/0505038




                                PRL96,102002(2006)




Marko Bračko: News from Belle                   Bled workshop 2010, Bled, Slovenia                          22
                     Trying to understand X(3872)
●   Belle evidence of X(3872)→J/ψπ+π-π0

                         (
                   BR X → J /ψ π+π −π 0             )
                                        = 1.0 ± 0.4 ± 0.3
                             (
                    BR X → J ψ π π
                                 + −
                                                )
 Comparable rate J/ψω and J/ψρ (large isospin breaking - not likely for a usual cc state)

                   arXiv:0505037




                                                             ω(782)-like


                                   M(π+π-π0)
                                                                   favoured JPC = 1++ or 2-+
●   Babar confirmation of X(3872)→J/ψω arXiv:1005.5190
     Decay in P-wave favoured→ JP=2- preferred
●   Is X(3872) a missing ηc2(2D) charmonium?


Marko Bračko: News from Belle                  Bled workshop 2010, Bled, Slovenia              12
                                X(3872): interpretation
    No standard charmonium assignment ...

Other possible (popular) interpretations:                     c u
    [ cu ][ cu ] or [ cd ][ cd ] tetraquark:             Xu =  u c
 - Requires different X mass in B+ and B0 decays.
 - Charged X[ cu ][ cd ] is expected.                               c d
   { Maiani et al., PRD 71, 014028 (2005) ;                    Xd =  d c
     Ebert et al. }

    D*0D0 molecule:
  - MX ~ m(D0) + m(D*0)
  - Isospin breaking expected
  - Favours DDπ over J/ψππ
  - JPC = 1++ (D0D*0 in S-wave)
  - Production in B0
     suppressed wrt. B+
      { Braaten et al.,
         hep-ph/0710.5482 }



Marko Bračko: News from Belle              Bled workshop 2010, Bled, Slovenia   17
                 X(3872): Searches for partners?
       Are there X(3872) production differences in BR's, depending on B charge?
       Are the produced X's different?

                   c u                   c d
              Xu =  u c             Xd =  d c

                   X(3872)→J/ψπ+π–                           diquark-antidiquark models
  PRD77,111101,2008                    ArXiv: 0810.1224
                                                             Xu and Xd from B0 and B+ decays
                                  B+→XK+
                   B →XK                                             ∆ MX= 8±3 MeV
                      +      +


                                    12.8σ                       {Maiani et al PRD71, 014028}
                8.6σ
                                                             ∆ MX = (2.7 ± 1.6 ± 0.4 ) MeV/c2
                                                             ∆ MX = (0.18±0.89±0.26 ) MeV/c2
                                                                           ΔM~0 : Not really supported
                                                                           by the 4-q hypothesis
  B0→XK0s                 2.3σ   B0→XK0s
                                              6.5σ           Br(B0→XK0) / Br(B+→XK+) =
                                                                   0.41 ± 0.24 ± 0.05
                                                                   0.82 ± 0.22 ± 0.05
                                                                            R~1: Not really supported by
                                                                            the molecular interpretation
Marko Bračko: News from Belle                  Bled workshop 2010, Bled, Slovenia                          18
                                     X(3872): D0D0π0 decay mode
                          B+→ +D D π 0/ B0→ 0D D π
                             K 0 0         K 0 0         0
                                                                                                      PRD77,011102,2008
PRL 97, 162002 (2006)




                              ( 6. 4σ )
                                                                                                  B+& B0 →D0D*0K
Belle : 447M BB




                                                                                            4.9σ

                                                                                                               347fb-1
                        B →K D0D*0
                                     D*→Dγ

                                                             New Belle vs New BaBar only ~2σ difference
                                                   ate
                                            U  pd
                                      ArXiv: 0810.0358
                          D*→D0π0
                                            605 fb-1




                                                                                                                   PDG
  Flatte vs BW similar result: 8.8σ
2 states X(3875) & X(3872)? Tetraquark interpretation {Maiani et al.,
hep-ph/0707.3354}: Xu → D D π 0 (X(3875)) ; Xd→ J/ψπ + π − (X(3872))
                             0 0

Marko Bračko: News from Belle                                    Bled workshop 2010, Bled, Slovenia                       19
             e+e-→J/ψcc cross section @ ~10.6 GeV
●   Model-independent measurements of e+e-→J/ψcc cross section
                       e+e-→J/ψ X                            PRD 79, 071101 (2009)
                                                             PRD 79, 071101 (2009)
                                                                   673 fb-1
                                                                    673 fb-1
                 e+e-→J/ψHcX

                      e+e-→J/ψ Xcc

                     e+e-→J/ψ cc


                 e+e-→J/ψ Xnon-cc



Conclusions (new constraints for theoretical models):
● e+e-→J/ψcc is the dominant mechanism for J/ψ production in e+e- annihilations
● e+e-→J/ψcc is dominated by cc fragmentation into open charm


                                ( only (16±3)% from double charmonium )
● σ(e e →J/ψ cc) / σ(e e →J/ψ X       ) ~ O(1)
      + -             + -
                               non-cc
Many Y states with Initial State Radiation
                 Study of 1- - states with ISR
●   Initial state radiation (ISR) gives access to JPC = 1- - states
                                                                                      ISR
                                                                      e-
●   Information on 1- - charmonia
             above the open-charm threshold                                          *
                                                                                             Xcc1
                                                                                                    --

●   Two main characteristics of
    ISR physics at B-factories:
                                                                      e+
    - Continuous ISR spectrum gives access to the wide √s range
    - High luminosity “compensates” for the emission of hard photons
     Sensitivity comparable to direct energy scan (e.g. CLEO-c, BES III)
                                                                           PRL 95 ,142001(2005)

                                                       Y(4260)                        ψ (2S)

●
    Y(4260) → J/ψπ+π- observed via ISR
         by BaBar (confirmed first by CLEO)
                                                                           8σ
                                                                                      233 fb-1
       BaBar's approach used also
        by Belle to search for these 1-- states
                  Study of 1- - states in e+e-→ ISRJ/ψπ+π-
          Using BaBar's approach
●   Study of e+e-→ ISR J/ψπ+π- also by Belle
●   Reconstruction: π+π- & J/ψ(→e+e-,μ+μ-)
    (no extra tracks allowed;  ISR not detected )             Y(4260)
                                                           New?     PRL 99, 182004 (2007)
●   Missing(recoil) mass identifies ISR:                  Y(4008)
                                                                     PRL 99, 182004 (2007)
                                                                          548 fb-1
                                                                           548 fb-1
    M rec=   E cms − E J / ψ    − p J / ψ  
                           *            2   * 2
                                +   -             +   -


●   Fit to M(J/ψπ+π-) with two coherent BW curves
●   Y(4260) is confirmed also by Belle
●   New Y(4008) resonance? { Might be: re-scattering from DD*;
                                        coupled-channel effect?}
                  Study of 1- - states in e+e-→ ISRJ/ψπ+π-
          Using BaBar's approach
●   Study of e+e-→ ISR J/ψπ+π- also by Belle
●   Reconstruction: π+π- & J/ψ(→e+e-,μ+μ-)
    (no extra tracks allowed;  ISR not detected )             Y(4260)
                                                           New?     PRL 99, 182004 (2007)
●   Missing(recoil) mass identifies ISR:                  Y(4008)
                                                                     PRL 99, 182004 (2007)
                                                                          548 fb-1
                                                                           548 fb-1
    M rec=   E cms − E J / ψ    − p J / ψ  
                           *            2   * 2
                                +   -             +   -


●   Fit to M(J/ψπ+π-) with two coherent BW curves
●   Y(4260) is confirmed also by Belle
●   New Y(4008) resonance? Not seen by BaBar ...
                                                                     Update
                                                                                preliminary
                                                                      Y(4260)

                                                                            (344±39)
                                                          Y(4008)?           events
                                                                                    454 fb-1
                  Study of 1- - states in e+e-→ ISRψ'π+π-
          Similar approach also for:                             PRL 99, 142002 (2007)
                                                                 PRL 99, 142002 (2007)
                                                                       673 fb-1
                                                                        673 fb-1
●   Study of e+e-→ ISR ψ(2S)π+π-
●   Reconstruction: π+π- & ψ(2S)(→π+π-J/ψ(→e+e-,μ+μ-))      New? New?
    (no extra tracks allowed;  ISR not detected )          Y(4360)
                                                                    Y(4660)
●   Missing(recoil) mass identifies ISR:
    M rec=   E cms − E ψ 2S     − pψ 2S   
                           *             2   * 2
                                 +   -             +    -


●   Fit to M(ψ(2S)π+π-) with two coherent BW curves
●   Belle's Y(4360) resonance:
    close to BaBar's Y(4325), but narrower
●   New Y(4660) resonance by Belle?
                  Study of 1- - states in e+e-→ ISRψ'π+π-
          Similar approach also for:                             PRL 99, 142002 (2007)
                                                                 PRL 99, 142002 (2007)
                                                                       673 fb-1
                                                                        673 fb-1
●   Study of e+e-→ ISR ψ(2S)π+π-
●   Reconstruction: π+π- & ψ(2S)(→π+π-J/ψ(→e+e-,μ+μ-))      New? New?
    (no extra tracks allowed;  ISR not detected )          Y(4360)
                                                                    Y(4660)
●   Missing(recoil) mass identifies ISR:
    M rec=   E cms − E ψ 2S     − pψ 2S   
                           *             2   * 2
                                 +   -             +    -


●   Fit to M(ψ(2S)π+π-) with two coherent BW curves
●   Belle's Y(4360) resonance:
    close to BaBar's Y(4325), but narrower
●   New Y(4660) resonance by Belle? (Seen also by BaBar?)PRL 98, 212001 (2007)
                                                              Y(4325)→ψ (2S)π π


                                                                    Y(4660) ?
                                                                              298 fb-1
                 Study of e+e-→ ISR Λc+ Λc- : X(4630)?
Reconstruction: Λc+(→pKS0, pK-π+, Λπ+ )& ISR detected; p (from Λc-) PRL 101, 172001 (2008)
                                                                     PRL 101, 172001 (2008)
                                                                           695 fb-1
                                                                            695 fb-1
                 e+e–→Λc+Λc– γISR
                                             Interpretations for the enhancement :
                X(4630)
                         w?                    ●
                                                 Dibaryonic peak near the threshold
                 8.2σ Ne                             seen e.g. in B→pΛcπ ...
                                                                 PRL 97, 242001 (2006)
                                                                               ─
                                                               6.2σ      B–→Λc+p π–




                                                 ●   ... but there is no peaking structure in
     ●
         Could be also: X(4630) = Y(4660)   ?            a similar decay: PRD 99,142002(2007)
                                                                            PRL 76, 092006 (2007)
              (compatible mass, width)


                                                                                         ee→ΛΛ via ISR




 ●   Can not exclude 53S1 charmonium :
         in some models M (53S1) ~4670MeV
             Exclusive D(*)D(*) cross sect. with ISR
                                                         PRD 77, 011103
                                                         (2008)
                                                                673 fb-1
●   e+e-→ DD , DD*, D*D* cross sections                                                       DD
    measured with ISR
                                                    ?
●   DD*, D*D*: using partial
    reconstruction;  ISR detected                                                      D+D*




                                                             ψ (4160

                                                                       Y(4360
                                                                                        -
    DD: fully reconstructed;  ISR used if




                                                                       )
                                                             )
                                                          ψ (4040
    detected                                                           PRL98, 092001 (2007)
     Recoil mass is again used




                                                      Y(4008



                                                      Y(4260
●                                                                        548 fb-1




                                                          )
                                                                                    D*+D*
     to identify ISR events




                                                      )



                                                      )
                                                                                    -

●   Method is well established




                                                                          ψ (4415


                                                                                    Y(4660)
                                             PRL 100, 062001 (2008)
                                                     673 fb-1




                                                                          )
●    Results: Difficult interpretation           D0D-
    in terms of resonances                       π+
    (there are many maxima/minima,               PRL 101, 172001 (2008)
                                                         695 fb-1
    model dependent coupled-channels
                                                 Λc+Λc–
    and threshold effects…)
                 1- - Y states: What are they?
        Difficult interpretation
     Charmonium options:                                          +  - J/ψ
●    Y states above DD threshold                Y(4260)
    but don’t match well the                               PRL 99, 182004 (2007)
                                                           PRL 99, 182004 (2007)
    peaks                             Y(4008)
    in D(*)D(*) cross-sections
●    Large widths for ψππ
     transition: not likely for
     conventional cc                                  Y(4660)
●    No cc assignments available            Y(4360)
                                                                  + - ψ ’
     in this mass region
    (there are too many 1-- states)                        PRL 99, 142002 (2007)
                                                           PRL 99, 142002 (2007)


    Other options:
●   Charm-meson threshold
    effects                                                PRD 77, 011105 (2008)
                                                           PRD 77, 011105 (2008)
●   DD1 or D*D0 molecules                                        Κ + Κ − J/ψ
●   cqcq tetraquarks
●   ccg hybrids predicted@4.2-
    5GeV DD1 mode should
    dominate
●   Coupled-channel effects
Recent news: Y(4140) search
                          PRELIMINARY
                        (reported at LP09)
            Search for Y(4140), observed by CDF
Observed as a J/resonance in exclusively reconstructed
B → J/K decays by CDF (PRL102, 242002 (2009))
   B+ → J/K+                                      M = 4143.0 ± 2.9 stat ± 1.2 syst MeV
   75 ± 10                      14 ± 5 (3.8σ)
                                                    Γ = 11.7 +8..3 stat ± 3.7 syst MeV
                                                             −5 0


              2.7 fb
                   -1                               BR(B+→Y(4140)K+;Y→J/)
                                                    = (9.0 ± 3.4 ± 2.9) x 10-6
                        M(J/) - M(J/)[GeV/c2]   D*sD*s molecule; [cscs] tetraquark?
    M(J/K)[GeV/c2]
            Search for Y(4140), observed by CDF
Observed as a J/resonance in exclusively reconstructed
B → J/K decays by CDF (PRL102, 242002 (2009))
   B+ → J/K+                                      M = 4143.0 ± 2.9 stat ± 1.2 syst MeV
   75 ± 10                      14 ± 5 (3.8σ)
                                                    Γ = 11.7 +8..3 stat ± 3.7 syst MeV
                                                             −5 0


              2.7 fb
                   -1                               BR(B+→Y(4140)K+;Y→J/)
                                                    = (9.0 ± 3.4 ± 2.9) x 10-6
                        M(J/) - M(J/)[GeV/c2]   D*sD*s molecule; [cscs] tetraquark?
    M(J/K)[GeV/c2]

Belle: B → J/K decays with 772x106 pairs                                 PRELIMINARY
  B+ → J/K+                                                            (reported at LP09)
  325 ± 21                    7.5+4.9-4.4(1.9σ) Preliminary
                                                             BR(B+→Y(4140)K+;Y→J/)
                                                               < 6 x 10-6 @ 90% C.L.
                                                                     Y(4140) not confirmed
                                                                       (but with low J/
                                      M(J/)[GeV/c2]                 effic. @ the threshold)
            Search for Y(4140) continued
                                                                            PRL 104, 112004 (2010)
                                                                            PRL 104, 112004 (2010)

Belle: Search for Y(4140) → J/ in two-photon production with 825 fb-1

● un-tagged events (e+,e- undetected)                    e+                          e+
● pt < 0.05 GeV/c                                                                           J/
                                                                       *
● pt is required to be balanced for the final state                              Y
                                                                       *                     
                                                          e-                          e-
     New?
    Y(4350)
                  8.8+4..2 ( 3.9σ )
                     −3 2                       M = 4350.6 +4..6 ± 0.7 MeV
                                                           −5 1
                           Preliminary                         +17.9
                                                Γ = 13.3       − 9.1   ± 4.1MeV
    Y(4140)?                 825 fb   -1

                                                 BR(Y(4350)→J/)
                                                      (6.4+3.1-2.3± 1.1) eV; for JP=0+
                 M(J/)[GeV/c2]               ={(1.5     +0.7
                                                              -0.5
                                                                  ± 0.3) eV; for JP=2+
● No Y(4140) signal (but efficiency drops at low J/ mass)
●
  New Y(4350)? (excited P-wave charmonium? Ds*Ds0* molecule?)
XY counterparts in bb and ss system?
          ss system: Y(2175) confirmed by Belle
                                                       PRD 80, 031101(R) (2009)
                                                       PRD 80, 031101(R) (2009)
Observed in Φ π+π- system in a dominant                        673 fb-1
                                                               673 fb-1
  Y(2175) → Φ f0(980) decay mode by BaBar (PRD 74, 091103 (2006)),
                                                          (2006)
                          confirmed by BES (PRL 100, 102003 (2008))
                                                            (2008)
Belle: e+e- → Φ π+π- and e+e- → Φ f0(980) cross section measurements with ISR




Two incoherent BW terms                              One BW term interfering
● Results are consistent with BaBar/BES;             with a non-resonant term
   Y(2175) width is larger, but with larger errors     (included in
● Φ(1680) and Y(2175) widths are both ~200 MeV
                                                     systematics)

      An excited 1-- ss state or an Ys ?
          bb system: Huge Γ((5S) →ππ(1S))




                                                                           !
                                                                           s
                                                                        vt
                                                                      0e
                                                                    ±2
                                                                     5
                                                                  32
  Belle, PRD 75, 071103 (2007)             Belle, PRL 100, 102003 (2008)




Can a 1- - bb state have such a rate, or a new state overlaps with (5S)?
           bb system: Huge Γ((5S) →ππ(1S))

Belle performed an energy scan: 7 fb-1 of data between (5S) and (6S)

                                                               Preliminary




          (5S)/(10860)




                       Different from      The mean is ~25 MeV higher
                                           ●


                     (5S) expectations: ● The width is ~1/2 of Г(10860)


Do we see a bottomonium analogue of 1- - cc states? (W. S. Hou, PRD, 017504)
                  Summary and conclusions




Tomi Živko: Hadronic spectroscopy at Belle   Bled workshop 2009, Bled, Slovenia   56
                          Summary and conclusions
Charmonium(-like) states :
         Following the exciting X(3872) discovery …
         … more information on its properties from radiative decays
          ... New exotic state observed by Belle in Bψ(2S)π±K decays:
                   Z(4430)+ (charged charmonium-like state)
         ... also Z1+ and Z2+ in B0 → K- +  c1 decays
         New charmonium[-like] spectroscopy established at 4-5GeV?
         Good candidates for molecular states; multiquarks; hybrids; ...
                              X(3872); Z(4430)+, Z1+ and Z2+; Y's; ...

         Q: Same type of XYZ spectroscopy in b(s)-quark sector?

                      As the data taking/processing just finished,
                final results are now eagerly awaited from Belle ...

                          ... stay tuned for more news!
Tomi Živko: Hadronic spectroscopy at Belle    Bled workshop 2009, Bled, Slovenia   58
Supplementary material
X(3872) → D0D*0
              Z(3930): conventional cc (' c2 )
                                                                 Belle : 395 fb-1
 e+                 e+                                           PRL 96, 082003 (2006)

         *               D                    acceptance    θ*: D, beam axis in γγ frame
                Z                               corrected
         *               D
                                        J=2 expectation
  e-                  e-
 ● un-tagged events (e+,e-               2/nof=1.9/9
undetected)
● D0→K- π+ , K- π+ π0, K- π+ π+ π-       J=0 expectation
   D+→K- π+ π+                            2/nof=23.4/9
                GeV/c
● pt(DD) < 0.0564 ± 18 events
                                                                 D si de band
               M = (3929±5±2) MeV/c2
               Γ = (29±10±2) MeV
                                                                       
                                       Γ γγ Z 3930 Br  Z3930 D D =
                         5. 3σ         0.18±0.05stat .±0.03 syst . keV
      D si de
      band                                 Z ≡ χ c2’ S.Godfrey,N.Isgur,PRD32,189 (1985)
                                           23P2 cc C.R.Münz,Nucl.Phys.A609,364 (1996)
          ( D
         M D )[GeV/ c2]
         More info: Z+(4430) Dalitz analysis
Different fit models
and the significance of Z(4430)+:




         Significance of Z(4430)+ in different fit models
                   is always larger than 5.4σ
           Z1+ & Z2+ in B0 → K- + c1 decays: fit
                                                                              •     data
                                                                            - - - background
   Fit results: M2(χc1π+) projections in 4 M2(K-π+ ) bands                   –̶̶ –̶ fit function
                                                                             ..... fit function without Z
                            Low M2(K-π+ )    Mid_L M2(K-π+ )   Mid_H M2(K-π+ )          High M2(K-π+ )
Null hypothesis:
    all known K*’s;
poor fit :
    C.L. ≤ 3*10-10

Add Z→χc1π+:
   signif. 10.7σ
   (√(-2lnL/L0) ),
   C.L. = 0.5%
MZ=(4150+31-16) MeV/c2
ΓZ=(352+99-43) MeV

Two Z→χc1π+:
signif. wrt 1 Z:
   5.7σ,
   C.L. = 42%
Z1+ & Z2+ : fit fractions




      There is small net interference effect
e+e-→ ISRψ'π+π- : BaBar & Belle combined fit

				
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