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Nuclear and Hadron Physics with Antiprotons PANDA _ FAIR

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Nuclear and Hadron Physics with Antiprotons PANDA _ FAIR Powered By Docstoc
					    Nuclear and Hadron
    Physics with Antiprotons

    PANDA @ FAIR
       Olaf N. Hartmann
INFN – Laboratori Nazionali di Frascati
Overview

 • The Facility: FAIR, HESR

 • The Physics Program

 • The Detector

 • The Collaboration

 • Outlook
The Accelerator Facility
                Proton Linac
Existing GSI:
                               Primary proton beam:
                               2(4)·1013/s @ 30GeV
UNILAC              100 Tm
SIS (18 Tm)
ESR

heavy ions                     HESR
up to uranium
≤ 2A GeV                              Production
                                      target

                               Accumulation and
                               cooling
The HESR
High Energy Storage (Synchrotron?) Ring



   Electron and stochastic cooling
   1011 stored antiprotons
   Design luminosity: 2·1032 cm-2s-1 (2·107 Hz)
   High resolution mode: ∆p/p ≈ 10-5
   High luminosity mode: ∆p/p ≈ 10-4



           1.5 to 15 GeV/c antiprotons
HESR Momentum Range




         CERN   FNAL
General Frame
Non-perturbative regime
 of QCD



• Quarks are confined
• Hadron mass >>
  Σ quark masses
• Self-interaction
  among gluons
PANDA Physics Program

• Hadron physics:
  Charmonium Spectroscopy
  Gluonic Excitations: Glueballs, Hybrids
• Nuclear physics:
  Charm in nuclear matter
  Double Λ Hypernuclei

• Open Charm, GPD, CP violation, transversity,
  timelike e.m. form factor of the proton, …
Charmonium Spectroscopy

                                     • Systematic study of the
                                     complete spectrum (high
                                     statistics, high precision)
                                     • hc
                                     • Radiative deexcitations
                                     • States above the DD-
                                     threshold
                                                 Crystal Ball




   PANDA: direct formation of all states
   possible
Glueballs

Mixing with other states
maybe less in charm quark
mass region

Clean signal: exotic quantum
numbers




                               Morningstar, Peardon, PRD 60(99)034509
                               UKQCD, Bali et al., PLB 309(93)378
 Charmed Hybrids
                                            LQCD
• Non-exotic hybrids:
  formation,
  production
• Exotic hybrids:
  production
  (JPC = 0+-, 1-+, 2+-)




                          Juge, Kuti, Morningstar, PRL 90(2003)161601
Hadrons in Matter

• Evidence from
  experiments in the                              π−
  light/strange quark       π                     π+
                                                       25 MeV

  sector: modification of                         K+
                            K
  meson properties in
                                                   100 MeV
  the medium                                      K−
• At PANDA this             D
                                                   D−
  research will be                                     50 MeV
  extended into the                                D+

  charm quark sector        A. Hayashigaki, PLB 487 (2000) 96
D-mesons in Matter

                                   Analogy to K± production in
                                     nuclei:
                                   •    enhanced production
                                       yield
                                   •    different D+ and D-
                                       yields

                                   Strategy:
                                   study D± production as a
                                      function of
 A. Sibirtsev, EPJ A6 (1999) 351   • p momentum
                                   • size of target nucleus
 Mass shift of D-mesons
GeV/c2    Mass
             ψ(33S1)                   Assumption (prejudice) :
   4
                                       cc states have small mass
                                       shift
 3.8       ψ(13D1)            DD
             ψ(23S1)              3,74 Attractive DD mass shift
                           vacuum
                                  3,64 ⇒ increased phase space
 3.6           χc2(13P2)      1ρ0          for DD decay
                                  3,54
               χc1(13P1)      2ρ 0     ⇒ opening of DD decay
 3.4           χc1(13P0)                   branch
                                       ψ(3770), ψ(3686) :
 3.2
                                       •     increased width
             ψ(13S1)
                                       •     decrease of e+e− / µ+µ−
   3     ηc(11S0)
                                           branching ratio
Charmonium Mass Shift


           ηc   J/ψ    Χc0,1,2      Ψ(3686) Ψ(3770)


expected
           -5   -7      -40           -100         -120
∆m/MeV     -8   -10     -60           -130         -140


decay
           γγ   l+l−   J/ψ γ           l+l−        l+l−
channel


                                 S.H. Lee, nucl-th/0310080
Absorption of J/Ψ


Studying the J/ψ
in p annihilation

→ relevance for
high energy
heavy ion collisions
(QGP signature)
Double Λ Hypernuclei
                         Kaons            possibility to study
                             _    trigger
   _                         Ξ            • ΛΛ interaction
   p                                     production of
                    Ξ - capture:          • ΛN interaction
                                          production of
 3 GeV/c                                      hyperon-
                                               hyperon-
                      - p →- ΛΛ + 28 MeV (ΛN → NN)
                    Ξ Ξ                     antihyperon
                                             antihyperon
                                          → does a (uuddss)
                                         close to threshold
                                          close to threshold
  capture of the
   capture of the                         state (H-particle)
      Ξ−−in a
       Ξ in a
    secondary
     secondary      X                     exist?
  target nucleus
   target nucleus
                                       Λ
                                   Λ        γ
                                 +23 MeV

       γ-spectroscopy
        γ-spectroscopy
            using
             using
        Ge-detectors
         Ge-detectors
Ω-Atoms

• Ω hyperon (sss)
  cτ = 2.46 cm, J = 3/2
  quadrupole moment Q ~ 3Jz2 – J (J +1)
  not vanishing
• Idea: study Ω atoms
• Similar to double Λ hypernulei:
  start with
  ΩΩ, form Ω− atom → hyperfine
  splitting
Detector Requirements
 Multi-purpose detector:

 • Identification of charged particles: e±, µ±,π±,K±,p, ...
 • Identification of neutral particles: γ,π0,η, …
 • Wide momentum coverage 100 MeV/c to 8 GeV/c
 • Angular coverage as complete as possible
 • Capable to stand 107 interactions/s
 • Resolution of secondary vertices (D±,D0,KS,Λ,Σ,
 …)
 • Modularity (e.g. Hypernuclear Physics Setup)
 • Efficient trigger
PANDA Detector
 Passive materials
                     Solenoid (2 T)




                       Interaction point
Beam pipe




                                           Dipole (2 Tm)



                     target pipe
PANDA Detector
 Target and
 Tracking detectors                             Forward tracker:
                                                 Drift chambers
                       Central tracker:
• pellet target        • straw tubes
• cluster jet target   • TPC
• wire target




                         Microvertex detector
PANDA Detector
Modified setup for the
   Detectors physics
Hypernuclear for                 Muon detectors
   Particle identification                               Electromagnetic and
                                                         Hadron calorimeter




DIRC




                                                  Cherenkov detector
         Time-of-flight barrel
                                     Electromagnetic
                                     calorimeter
The PANDA Collaboration
• Austria
  SMI Vienna                                           • Poland
                                                         U Cracow, Katowice, TU+SINS Warsaw
• Belaruz
  U Minski                                             • Romania
                                                         IFIN Bucharest
• China
  IHEP Beijing, IMP Lanzhou                            • Russia
                                                         JINR Dubna, BINP Novosibirsk, PNPI
• Finland                                                St. Petersburg
  IoP Helsinki

• France                                               • Spain
                                                         IFIC Valencia
  IPN Orsay

• Germany                                              • Sweden
                                                         U+KTH Stockholm, ISV+TSL Uppsala
  U Bochum, Bonn, TU Dresden, U Erlangen, Frankfurt,
  Gießen, GSI, FZJ, U Mainz, TU München, U Münster,
  Tübingen                                             • Switzerland
                                                         U Basel
• Italy
  U/INFN Catania, Ferrara, Genova, Milano,             • United Kingdom
  Pavia, Piemonte Orientale, Torino +Politecnico,        U Edinburgh, Glasgow
  Trieste, LNF
                                                       • USA
                                                         Northwestern U
     http://www.gsi.de/panda/
Outlook

• The Technical Progress Report for
  PANDA has been positively evaluated by
  the Advisory Committees
• R&D for detector hardware as well as
  simulations are in progress
  → Physics Workshop, Uppsala, June 13-17
• PANDA will be ready to accept the first
  beam in HESR

				
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posted:11/16/2011
language:Italian
pages:23