antiProton Annihilation at DArmstadt - PowerPoint PPT Presentation

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antiProton Annihilation at DArmstadt

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Excited gluons: Exotic hybrid mesons & glueballs. Nucleon spin puzzle: transverse quark ... (strangeness) G nther Rosner. FAIR UK community _at_ DL, 25/01/06. 22 ... – PowerPoint PPT presentation

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Title: antiProton Annihilation at DArmstadt


1
antiProton Annihilation at DArmstadt
  • Physics programme
  • Quark confinement Charmonium spectroscopy
  • Excited gluons Exotic hybrid mesons glueballs
  • Nucleon spin puzzle transverse quark spin
    distribution functions in the nucleon
  • Generalised parton distributions (in the nucleon)
  • Time-like nucleon formfactors
  • Modifications of hadrons in the nuclear medium
  • Double Hypernuclei
  • Antiproton facility HESR PANDA
  • Timelines

2
Facility for Antiproton and Ion Research
SIS 100
SIS 300
SIS 18
  • Broad range of high-intensity secondary beams
  • Radioactive nuclei
  • Antiprotons
  • Cooler and storage rings
  • Parallel operation

PANDA
HESR
Collector ring
3
PANDA physics programme
Charmonium spectroscopy
Exotics charmed hybrids heavy glueballs
Time-like form factors
Medium modificationsof charmed mesons
Drell-Yanprocesses
Hard exclusiveprocesses
CP-violation(D ? - sector)
Hypernuclei
4
Strong interaction physics QCD vs QED
QED
QCD
5
Running strong coupling constant
Particle Physics
Nuclear Physics
6
Lattice QCD ? Confinement
Distance between Quarks fm
G. Bali et al.,hep-lat/0003012
7
Charmonium spectroscopy a high-precision
testing ground for confinement
  • Direct formation of charmonium in pbarp
  • Experimental tasks
  • find ?c (21S0) state
  • confirm hc(11P1) state
  • measure transition rates
  • identify states above DbarD threshold
  • Refine confinement potential(spin dependence?)
  • Challenge for lattice QCD

8
Charmed Hybrids - theory
  • Lattice-QCD
  • S-potential from one-gluon exchange
  • P-potential from excited gluon flux
  • Charmed hybrids expected atmHcc 4.2 - 4.5
    GeV/c2
  • Light charmed hybridscould be narrow, if open
    charm decays are inaccessible or suppressed

V(R)/GeV
Hcc
4
DD
3.5
3
R/r0
2
1
ltr2gt and rBreakup
9
Charmed hybrids - experiment
Quantum number rules for quark-antiquark pair-
JPC 0 0 1 1 2
Allowed combinations
JPC 0 0 1 2
Not-allowed exotic
Combine with S1 for quarks to get
Flux tube model 1st excited state of flux tube
has J1
JPC 0- 0- 1- 1- 2- 2-
exotic
(Exotic mesons are not generated when S0)
10
Charmed Hadrons _at_ PANDA
11
Search for heavy glueballs _at_ PANDA
  • Light glueballs
  • candidate f0(1500), 0 ?110MeV
  • no flavour blind decay
  • mix with neighbouring scalar mesons
  • Heavy glueballs
  • flavour blind decay? charmed final states!
  • only a few charmed mesons around 3-4 MeV/c2 (less
    mixing!)
  • Exotic heavy glueballs (no mixing)
  • m(2-) 4140(50)(200) MeV
  • m(0-) 4740(70)(230) MeV

Morningstar Peardon, PRD60(1999)34509Morningsta
r Peardon, PRD56(1997)4043
12
What is needed experimentally?
  • Gluon-rich environment
  • Proton-antiproton annihilation
  • Precision resonance scan
  • Cooled antiproton beam
  • High luminosity
  • All quantum numbers measured
  • Large acceptance detector
  • High statistics samples
  • Several years of beamtime

13
Nucleon structure The spin puzzle
COMPASSRHIC
Gluon orbitalangular momentum(in principle
accessible through GPDs)
Gluon polarisationpositive (HERMES)negative
(SMC)
HERMESCOMPASSPANDAJLab-upgrade
Quark spin?? ? 0.25
Quark orbitalangular momentum(accessible
through GPDs)
Transversity
HERMES, COMPASSFNAL, PANDA, PAX
14
Parton distributions
Leading twist
directlyaccessible in Drell-Yan
Chirally odd
T-odd
15
Drell-Yan processes
  • Cross section depends on elementary process
  • Measured as a function of polar angle ? and
    azimuthal angle ?
  • Direct access to quark distribution functions(no
    fragmentation function involved)
  • Complementary to Deep Inelastic Scattering (DIS)

16
Drell-Yan processes and parton distributions
  • Unpolarised DY ? Boer-Mulders DF h1- (PANDA _at_
    HESR)
  • Single or double polarisation DY ?transversity
    h1(PAX _at_ HESR)

17
Hard exclusive processesGeneralised Parton
Distributions (GPD)
Crossed channel (time-like) Compton Scattering
  • Hard scalelarge s 10 GeV2 and t s, or
    large pT
  • Soft part can be separated and parameterised by
    Generalised Parton Distribution amplitudes
  • Experimental problemlarge hadronic background
    (reject e.g. ?0?0 kinematically)

18
Time-like proton form factors
Crossed channel
  • Goals
  • To measure time-like FF from threshold up to
    high s q2 in one experiment(reduced systematic
    error)
  • To compare with space-like FFs (pQCD at large s?)
  • PANDA
  • Wide kinematical range
  • Large solid angle coverage
  • Large statistics
  • High-quality measurement of both GE and GM

19
Hadron mass shifts in the nuclear medium
  • HADES CBM
  • Pseudoscalar vector mesons ?, ?, F
  • PANDA
  • Extension to charm sector

20
HypernucleiExtension of the Nuclear Chart
understanding the YN interaction
21
Hypernuclei
3rd dimension of nuclear chart (strangeness)
New high resolution ?-Spectroscopy with
Ge-Detectors
22
Production of double Hypernuclei
?-
?-(dss)p(uud) ? ?(uds)?(uds)
23
High Energy Storage Ring (HESR)
24
Target generator
Muon counters
EM and hadron calorimeters
Solenoid
Dipole
RICH
  • Tracking of charged particles
  • Identification of ?, e, µ, p, K, p, anti-p
  • High rate capability
  • Fast trigger scheme

25
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26
Timelines
  • FAIR contract signed by participating countries
    by 2006
  • PANDA technical design report 2007/8
  • PANDA commissioning 2012/13 in Phase II of FAIR
    construction
  • Data taking 2013
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