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PANDA: Experiments to Study the Properties of Charm in Dense Hadronic Matter

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. Why Are Hadrons So Heavy?. Hadron Masses. 2M u + M d ~ 15 MeV/c 2 M p = 938 MeV/c 2.

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PANDA: Experiments to Study the Properties of Charm in Dense Hadronic Matter

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  1. 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

  2. Why Are Hadrons So Heavy? James Ritman Univ. Giessen

  3. Hadron Masses 2Mu + Md ~ 15 MeV/c2 Mp = 938 MeV/c2 Protons = (uud) ? no low mass hadrons (except p, K, h) spontaneously broken chiral symmetry (P.Kienle)

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

  5. The QCD vacuum is not empty Hadron masses are generated by the strong interaction with <qq> (also with gluon condensate) Quark 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. James Ritman Univ. Giessen

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

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

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

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

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

  11. The Experimental Facility James Ritman Univ. Giessen

  12. HESR

  13. HESR: High Energy Storage Ring Beam Momentum 1.5 - 15 GeV/c High Intensity Mode: Luminosity 2x1032 cm-2s-1 (2x107Hz) dp/p (st. cooling) ~10-4 High Resolution Mode: Luminosity 2x1031 cm-2s-1 dp/p (e- cooling) ~10-5 James Ritman Univ. Giessen

  14. James Ritman Univ. Giessen

  15. Target • A fiber/wire target will be needed for D physics, • A pellet target is conceived: • 1016 atoms/cm2 for D=20-40mm 1 mm James Ritman Univ. Giessen

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

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

  18. PID with DIRC (DIRC@BaBar) GEANT4 simulation for HESR: James Ritman Univ. Giessen

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

  20. Electromagnetic Calorimeter James Ritman Univ. Giessen

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

  22. 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

  23. Example reaction: pp  J/y + F (s = 4.4 GeV/c2) Tracking Resolution Single track resolution Invariant mass resolution J/y  m+m- F K+K- s(J/y) = 35 MeV/c2 s(F) = 3.8 MeV/c2 James Ritman Univ. Giessen

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