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Report on HFAG
Y.Sakai (KEK) for HFAG
CKM WS 2003 at Durham 1
(General)
• Inherit activities of LEP HF Working group
• Role
provide Averages for
Conferences (up-to-date, including preliminary, often)
PDG (published results)
with “Consistent manner” (mentioned later)
• History
- discussions at 1st CKM workshop (Feb-2002, CERN)
- discussions at FPCP (May-2002, Philadelphia) new HFAG
(for ICHEP02, averages were provided with existing WGs)
- Nov-2002: new HFAG started restructuring
for Winter conference updates
CKM WS 2003 at Durham 2
(General 2)
• First averages from new HFAG for 2003 winter conferences
• Averages for PDG2003 (end March)
B lifetimes, Dmd, semi-leptonic Br, sin2b…, rare-decay Br/Acp
Web page: please surf
http://www.slac.stanford.edu/xorg/hfag/
[ http://belle.kek.jp/mirror/hfag/ (KEK mirror) ]
Hope they serve as basis of discussions of WS
CKM WS 2003 at Durham 3
Organization
Chairs: Daivid Kikby (BaBar) and Yoshi Sakai (Belle)
HFAG members: contacts from
BaBar,Belle,LEP,CLEO,CDF,D0,PDG
Subgroups leader
- B-lifetimes/Oscillations: O.Schneider (Belle)
- Semi-leptonic (Vcb,Vub): U.Langenegger (BaBar)
- Rare-decay Br/Asymmetry: P.Chang (Belle)
- UT-angles: A.Hoecker (BaBar)
New !
CKM WS 2003 at Durham 4
Philosophy
use common input 'physics parameters'
ex) Dmd B0 lifetime (updated averages)
re-scale each result
take into account correlated systematic errors in av.
'physics parameter' uncertainty sign of systematic error
use common method to extract 'physics parameter'
ex) semi-leptonic Br Vcb
follow PDG method for established averages (Br etc.)
determine the Best Averages
CKM WS 2003 at Durham 5
Tools
• COMBOS (COMBine B OScillation results)
- originally developed for oscillation average
- c2 fit taking into account statistical uncertainties,
correlated/uncorrelated sys. errors
- extended to other averages ex) Vcb
try to use for other averages (UT-angles)
[also, other utilities/programs are used]
CKM WS 2003 at Durham 6
B lifetime/Oscillation
O.Schneider (Belle)
B lifetime, Oscillation, DG groups: merged
B meson/baryon lifetimes: (L.Ciaccio CDF)
B hadron fractions:
(O.Schneider)
Oscillation frequency: Dmd , Dms
DG : DGs , DGd (F.Parodi, C.Weser)
Inputs to other subgroups
Procedures: well established (except DGd )
COMBOS based (specific prog. for b-fracton, DGs)
DGd : new measurements available (DELPHI, BaBar)
|q/p|, CPTV parameters to be included
CKM WS 2003 at Durham 7
B lifetime
B Hadron Liftimes
b hadron species average lifetime t/t B 0
B0 1.539 0.014 ps
B+ 1.656 0.014 ps 1.073 0.014
Bs 1.461 0.057 ps 0.949 0.038
Bc 0.46 +0.18 ps
-0.16
Lb 1.229 0.080 ps
Xb-, Xb0 mixture 1.39 +0.34
-0.28 ps
b-baryon mixture 1.208 0.051 ps 0.785 0.034
b-hadron mixture 1.573 0.007 ps
CKM WS 2003 at Durham 8
Dmd
Dmd 0.502 0.006 ps-1
CKM WS 2003 at Durham 9
Dms and DGs
DGs/Gs
<0.54 (95%CL)
>14.4 ps-1
(95%CL)
CKM WS 2003 at Durham 10
Smileptonic
Vcb and Vub working groups: merged U.Langenegger(BaBar)
• Determine the best average values: V.Luth (BaBar)
T.Iijima (Belle)
semileptonic B decay branching ratios M.Shapiro (CDF)
F(1)|Vcb|, |Vcb|, and |Vub| (Incl/Exclusive) M.Artuso (CLEO)
P.Roudeau (DELPHI)
• Use a consistent approach (currently): E.Barberio (OPAL)
- Consistent approaches in all the experiments
based on the latest theoretical etc. developments
- Checking consistency of results between the expts,
- Evaluating the systematics common to all the expts,
- Comparing the results of the different methods
• Trying to understand their theoretical errors
How to control/minimize them
[in discussion with theorists] This Workshop !
CKM WS 2003 at Durham 11
Smileptonic(2)
Br: Inclusive BX l n, Exclusive B0D*- l n
Vcb : Exclusive B0 D*- l n
Common inputs, systematics are identified
newly f+/f0 included
use COMBOS
Vcb : Inclusive
use GSL [average of LEP and U(4S)]
-
L, L1 : CLEO (bsg spectrum, hadronic mass moment)
Vcb = 40.7(1 0.010exp 0.012L’s 0.021/m3)x10-3
CKM WS 2003 at Durham 12
Br
Br: Inclusive BX l n Exclusive B0D*- l n
CKM WS 2003 at Durham 13
Vcb: exclusive
Vcb : Exclusive B0 D*- l n
CKM WS 2003 at Durham 14
Vub
Vub
No average is given
(to be discussed at
this Workshop)
CKM WS 2003 at Durham 15
Rare Decay
Method P.Chang (Belle)
J.Smith (BaBar)
1. Preliminary results reported in any conference J.Alexander (CLEO)
with written documentation are accepted.
2. Average is performed using the PDG method.
3. The most stringent limit will be used for upper limits.
4. All central values will be used for the averages
for decay channels observed by at least one experiment.
1. radiative and leptonic B decays:
Now
2. hadronic B decays: (no decays with cham)
available:
3. baryonic B decays:
4. Acp:
(to be linked from HFAG web page)
http://hep1.phys.ntu.edu.tw/~pchang/rare_hfag.html
CKM WS 2003 at Durham 16
B+ charmless
Compilation
of
B+ Mesonic
Branching
Fractions
Pre-Winter03
CKM WS 2003 at Durham 17
B0 charmless
Compilation
of
B0 Mesonic
Branching
Fractions
Pre-Winter03
CKM WS 2003 at Durham 18
B+- DCPV
Charmless Hadronic CP Asymmetries Pre-Winter03
B
B0
CKM WS 2003 at Durham 19
UT-angle
A.Hoeker (BaBar)
World averages for measurements related to M.Shapiro (CDF)
angles of the Unitarity Triangle (~Time-dep. CPV) H.Evans (D0)
g related measurements in future J.Smith (BaBar)
O.Long (BaBar)
Effective UT angles (e.g., aeff in B0 p+p-): Y.Sakai (Belle)
- no attempts are made at this early stage
to derive angles if this requires input from QCD.
Interpretation of the results will be given at a future stage
close collaboration with theorists has to be established
This Workshop
- 0
Now available: (cc)K , fKs, h’Ks, K+K-Ks, J/yp0, D*+D*-, D*+D-
p+p-, r+p-
CKM WS 2003 at Durham 20
sin2b
sin2b(f1)
• Re-scaled to
common inputs
(updated Dmd, tB)
• correlated sys.
errors
• use COMBS
CKM WS 2003 at Durham 21
J/y p0: S, A
B0 J/yp0
(= -A)
CKM WS 2003 at Durham 22
p;p-: Spp, App
B0 p+p- (2D averages with correlation)
(= -A)
CKM WS 2003 at Durham 23
p+p-: d vs |P/T|
givn (r,h)
measured Spp,Cpp
constraint on
|P/T|, arg(T/P)had
A(B0 p+p-)
= Rueig T + RcP
(top-loop eliminated
using unitarity)
CKM WS 2003 at Durham 24
Dependencies
b fractions Br(bcln),Vcb
B lifetime
Dms Dmd Br(buln),Vub
DGs
PDG: Br(D etc.)
Time-dep CPV
UT-angles Rare-decay Br/CPV
CKM WS 2003 at Durham 25
Summary
New HFAG is now providing World Averages
• Hope they serve as basis of discussions
• Have useful feedback/interactions with
experiment/theorists at this Workshop
Please visit to take a look
Web page: http://www.slac.stanford.edu/xorg/hfag/
http://belle.kek.jp/mirror/hfag/ (KEK mirror)
Welcome to use plots etc. for your convenience
CKM WS 2003 at Durham 26
current member list
• Jim Alexander (Cornell, CLEO)
• Marina Artuso (Syracuse, CLEO)
• Marco Battaglia (CERN, LEP)
• Elisabetta Barberio (CERN, LEP)
• Tom Browder (U.Hawaii, BELLE)
• Paoti Chang (NTU, BELLE)
• Hal Evans (Columbia, D0)
• Lawrence Gibbons (Cornell, CLEO)
• Andreas Hoecker (LAL-Orsay, BABAR)
• Toru Iijima (Nagoya, BELLE)
• David Kirkby (UC Irvine, BABAR)
• Urs Langenegger (SLAC, BABAR)
• Yoshi Sakai (KEK, BELLE)
• Olivier Schneider (U.Lausanne, BELLE)
• Marjorie Shapiro (LBL, CDF)
• Jim Smith (Colorado, BABAR)
• Achille Stocchi (LAL-Orsay, LEP)
• Weiming Yao (LBNL, PDG)
CKM WS 2003 at Durham 27
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