James Ritman Univ. Giessen PANDA: Experiments to Study the Properties of Charm in Dense Hadronic Matter Overview of the PANDA Pbar-A Program The Pbar Facility.

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Presentation transcript:

James Ritman Univ. Giessen PANDA: Experiments to Study the Properties of Charm in Dense Hadronic Matter Overview of the PANDA Pbar-A Program The Pbar Facility The PANDA Detector Selected Simulation Results

James Ritman Univ. Giessen Why Are Hadrons So Heavy?

Hadron Masses Protons = (uud) ? 2M u + M d ~ 15 MeV/c 2 M p = 938 MeV/c 2 (P.Kienle) no low mass hadrons (except , K,  ) spontaneously broken chiral symmetry

Spontaneous Breaking of Chiral Symmetry Although the QCD Lagrangian is symmetric, the ground state need not be. (e.g. Fe below T Curie ) Example:

James Ritman Univ. Giessen Quark Condensate The QCD vacuum is not empty Hadron masses are generated by the strong interaction with (also with gluon condensate) The density of the quark condensate will change as a function of temperature and density in nuclei. This should lead to modifications of the hadron’s spectral properties.

Hadrons in the Nuclear Medium Spectral functions W.Peters et al., Nucl. Phys. A632, 109 (1998).S.Klimt et al., Nucl. Phys. A515, 429 (1990). Reduction of

Hadron Production in the Nuclear Medium c d _ d d u c _ d repulsive attractive D-D- D+D+ d d u d d u d d u d d u d d u  Quark atom Mass of particles may change in dense matter

J/  Absorption in Nuclei J/  absorption cross section in nuclear matter p + A  J/  + (A-1)

James Ritman Univ. Giessen Advantages of p-A Reactions Compared to A-A Much lower momentum for heavy produced particles (2 GeV for “free”) (Effects are smaller at high momentum) Open charm mass region (H atom of (single light quark) Well defined nuclear environment (T and  )

Strange Baryons in Nuclear Fields Hypernuclei open a 3 rd dimension (strangeness) in the nuclear chart -- 3 GeV/c K+K Trigger _  secondary target p Double-hypernuclei: very little data Baryon-baryon interactions:  -N only short ranged (no 1  exchange due to isospin)  impossible in scattering reactions  - (dss) p(uud)   (uds)  (uds)

James Ritman Univ. Giessen The Experimental Facility

HESR

James Ritman Univ. Giessen HESR: High Energy Storage Ring Beam Momentum GeV/c High Intensity Mode: Luminosity 2x10 32 cm -2 s -1 (2x10 7 Hz)  p/p(st. cooling)~10 -4 High Resolution Mode: Luminosity 2x10 31 cm -2 s -1  p/p(e- cooling)~10 -5

James Ritman Univ. Giessen

Target A fiber/wire target will be needed for D physics, A pellet target is conceived: atoms/cm 2 for D=20-40  m 1 mm

James Ritman Univ. Giessen Micro Vertexing 7.2 mio. barrel pixels 50 x 300 μm 2 mio. forward pixels 100 x 150 μm

Central Tracking Detectors example event: pp    4K MVD: (Si) 5 layers Straw-Tubes: 15 skewed double-layers Mini-Drift-Chambers

James Ritman Univ. Giessen PID with DIRC GEANT4 simulation for HESR:

James Ritman Univ. Giessen Open Charm As an example of the Pbar P   (3770)  DD Analysis Peak to background of about 6:1 M inv [GeV]

James Ritman Univ. Giessen Electromagnetic Calorimeter Detector materialPbWO 4 Photo sensorsAvalanche Photo Diodes Crystal size  35 x 35 x 150 mm 3 (i.e. 1.5 x 1.5 R M 2 x 17 X 0 ) Energy resolution 1.54 % /  E[GeV] % Time resolution   130 ps (N.B. with PMT!) Total number of crystals7150

James Ritman Univ. Giessen Detection of Rare Neutral Channels PANDA As an example:  c   (full phase space) Comparison with E835 (PLB 566,45)

James Ritman Univ. Giessen Summary High luminosity cooled p-bar from 1-15 GeV/c Wide physics program including pbar-A reactions Panda collaboration forming

James Ritman Univ. Giessen Tracking Resolution J/       K + K -  (J  ) = 35 MeV/c 2  (  ) = 3.8 MeV/c 2 Example reaction: pp  J/  (  s = 4.4 GeV/c 2 ) Single track resolution Invariant mass resolution