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CBM Physics at SIS100 Results of SBM SIS100 Meeting in Darmstadt 27.04.2009

CBM Physics at SIS100 Results of SBM SIS100 Meeting in Darmstadt 27.04.2009. P.Senger (GSI) ,Yuri Zaitsev (ITEP). Physics of Compressed Baryonic Matter 1-st CBM-Russia-JINR Collaboration Matter May 19-22, 2009, Dubna, Russia.

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CBM Physics at SIS100 Results of SBM SIS100 Meeting in Darmstadt 27.04.2009

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  1. CBM Physics at SIS100Results of SBM SIS100 Meeting in Darmstadt 27.04.2009 P.Senger (GSI) ,Yuri Zaitsev (ITEP) Physics of Compressed Baryonic Matter 1-st CBM-Russia-JINR Collaboration Matter May 19-22, 2009, Dubna, Russia

  2. Workshop on Nuclear Matter Physics at SIS100GSI Lecture hallMonday April 27, 2009 • 9:00 - 9:20 Introduction P.Senger • 9:20 - 10:00 Electromagnetic and strong probes of compressed E.Bratkovskaya baryonic matter at SIS100 energies • 10:00 - 10:40 An Integrated Hydro-Boltzmann approach for heave M.Bleicher ion reactions at FAIR energies • 11:00 - 11:40 MEMO production at FAIR J.Steinheimer • 11:40 - 12:20 Conical Emission in Asymmetric Nucleus-Nucleus P.Rau Collisions at FAIR • 12:20 - 12:50 Particle yields from the thermal model A.Andronic • 14:00 - 14:20 Dense nuclear matter – an experimentalists view J.Stroth • 14:20 - 14:40 CBM physics at SIS100 N.Herrmann • 14:40 - 15:00 Hadron measurements with HADES P.Tlusty • 15:00 - 15:20 Hadron (incl. hyperon) measurements with CBM D.Kresan • 15:20 - 15:40 Di-electron measurements with HADES J.Pietraszko • 15:40 - 16:00 Experimental search for the nuclear analog of the Y.Murin Prandtl-Glauert singularity effect at SIS100 • 16:20 - 16:40 Open charm production in 30 GeV p + A with CBM I.Vassiliev • 16:40 - 17:00 Charmonium production in 25 GeV p+ A with CBM A.Kiseleva • 17:00 - 18:30 Discussion

  3. Our ultimate goals: • Search for the critical point The phase diagram of QCD • Study of the phase transition from hadronic to partonic matter – Quark-Gluon-Plasma SIS 100 • Study of the in-medium properties of hadrons at high baryon density and temperature

  4. Our ultimate goals: • Search for the critical point The phase diagram of QCD • Study of the phase transition from hadronic to partonic matter – Quark-Gluon-Plasma SIS 100 • Study of the in-medium properties of hadrons at high baryon density and temperature

  5. s s u d s u Nuclear Matter Physics at SIS100 P. Senger Λ ? Outline  Results from AGS  Multi-strange hyperons and the nuclear matter EOS  Hadrons in dense nuclear matter: Dilepton spectroscopy  Heavy flavor physics: production and propagation of charm  Search for (short-lived) strange matter Λ

  6. Heavy-ion collisions at SIS100: Transport model predictions UrQMD: L.V. Bravina et al., Phys. Rev. C60 (1999) 044905 E. Bratkovskaya, W. Cassing Au+Au collisions up to 11 AGeV: exploring properties of dense hadronic (resonance) matter in the vicinity of the phase transition

  7. Chemical freeze-out: a different view J. Randrup, J. Cleymans, Phys. Rev. C 74, 047901 (2006)

  8. Results from AGS (1988-1999) Exhaustive measurements of global observables such as basic hadronic spectra, kaon and lambda production, collective flow and HBT. No measurements of rare probes such as hadronic resonances, multistrange hyperons (except one point at 6 AGeV), lepton pairs and charmed particles. No fluctuation studies.

  9. Detector setups at FAIR • CBM at SIS100/300: • Electrons, muons, charm, hadrons, photons, exotica • Nuclear collisions from 4 - 45 A GeV • HADES at SIS100: • Electrons. hadrons, (photons) • Nuclear collisions from 1 - 10 A GeV

  10. The equation-of-state of (symmetric) nuclear matter Equation of state: P = dE/dVT=const V = A/ρ dV/ dρ = - A/ρ2 P = ρ2 d(E/A)/dρT=const C. Fuchs, Prog. Part. Nucl. Phys. 56 (2006) 1 T=0: E/A = 1/r  U (r)dr Effective NN-potential: U(r)=ar+brg • E/A(ro) = -16 MeV • d(E/A)(ro)/dr = 0 • Compressibility: k = 9r2 d2(E/A)/ dr2 k = 200 MeV: "soft" EOS k = 380 MeV: "stiff" EOS

  11. ? (sub)threshold production of K+ mesons

  12. Probing the nuclear equation-of-state: proton collective flow P. Danielewicz, R. Lacey, W.G. Lynch, Science 298 (2002) 1592 K = 170 – 210 MeV K = 170 – 380 MeV Within microscopic transport models the collective flow is sensitive to:  The nuclear matter equation of state  In-medium nucleon-nucleon cross sections  Momentum dependent interactions Transverse in-plane flow: Elliptic flow: F = d(px/A)/d(y/ycm) dN/dF  (1 + 2v1cosF + 2v2 cos2F)

  13. Exploring the "nuclear" EOS at 3ρ0 < ρ < 7ρ0 with (sub)threshold production of multistrange hyperons Measure the excitation function of (multi-strange) hyperon production in heavy-ion collisions from 2 - 15 AGeV: Direct production: NN  Λ0Λ0 NN (Ethr = 7.1 GeV) NN +- NN (Ethr = 9.0 GeV) NN +- NN (Ethr = 12.7 GeV) Production via multiple collisions: Hyperons (s quarks): 1. NN K+Λ0N,NN  K+K-NN, 2. Λ0K-- 0, 3.-K--- Antihyperons (anti-s quarks): 1. Λ0 K++0 , 2. +K+++. AGS SPS

  14. Identification of hyperons in heavy-ion collisions with the CBM Silicon Tracker via decay topology (no PID) -- (uds) (dss) (sss) central Au+Au collisions at 6 AGeV:

  15. no dilepton data between 2 and 40 A GeV no dilepton data from heavy systems below 40 A GeV Information needed in addition to dileptons from A+A: π, K, p, Λ, ... to constrain the fireball evolution ρ→ππ, φ→KK to measure the freeze-out contributions  p+A collisions to determine the contribution of primordial ρ's Looking into the fireball using penetrating probes: Dilepton measurements in heavy-ion collisions CERES 2000: 159 AGeV Pb+Au beam intensity: 106 ions / spill 1 spill = 4 s beam and 15 s pause targets: 13 x 25 μm Au (~1 % interaction) trigger: 8% most central Event rate = 470 / spill (~ 25 Hz = 15 Mio events/week) 5-week-long run in Oct.–Nov. 2003 ~ 4 × 1012 ions delivered in total

  16. Dileptons from central Au+Au collisions at 8A GeV HADES Monte Carlo simulation: Dielectron invariant mass spectrum CBM Full event reconstruction: Dimuon invariant mass spectrum (Only ω meson as signal) with TOF

  17. Heavy flavor physics I: Charm production at threshold energies Input to hadronic transport models (HSD): Parameterization of measured cross sections O. Linnyk et al., Nucl. Phys. A786 (2007) 183 Input to Statistical Hadronization Model A. Andronic et al., Phys. Lett. B659 (2008) 149 p-beam SIS100 Measure: p+A → D+X, p+A → J/ψ+X, p+A → χc1,2+ X,p+ A → ψ'+X

  18. Heavy flavor physics II: Charmonium propagation in nuclear matter J/ψ suppression at FAIR energies dominated by nuclear absorption (Xingbo Zhao and Ralf Rapp) new NA60 data: 158 GeV p+A E. Scomparin, QM2009 absJ/ (158 GeV) = 7.6 ± 0.7 ± 0.6 mb absJ/ (400 GeV) = 4.3 ± 0.8 ± 0.6 mb Measure: p + C (....... Au) → J/ψ + X

  19. Heavy flavor physics IV: In-medium properties of D-mesons Xingbo Zhao and Ralf Rapp D meson mass modification affects the ψ'/(J/ψ) ratio New absorption mechanism in nuclear medium if D meson mass reduced: ψ'→ D+D- Not possible in vacuum: ψ'(3686 MeV) < D+D-(3738 MeV) Measure: p + C (....... Au) → J/ψ, ψ'

  20. Production of χc charmonium states(by M.Prokudin) • 2 main sources • combinatorics • e+e- pair from χc mixed with wrong reconstructed photon p + C 30 GeV

  21. CBM: Charm production in 30 GeV p+C collisions(I.Vasiliev, A.Kiseleva) p+C → D +X D → Kππ p+C → J/ψ +X J/ψ → μ+μ- STS with 10 microstrip stations St.1-2: strip pitch 25 μm, strip length 10 mm St.3-8: strip pitch 60 μm, strip length 20-60 mm 6 J/ψ recorded in 1010 events (b=0) (3·104 J/ψ per week)

  22. Being prepared for exotica: experimental reconstruction of a multistrange di-baryon p p- L2 p (X0L)b L1 p- Signal: strange dibaryon (0)b   (cτ=3cm) M= 10-6, BR = 5% Background: Au+Au @ 25 AGeV 32  per central event 11  reconstructable

  23. Summary: nuclear matter physics at SIS100 • Physics case: •  Nuclear matter equation-of-state • at baryon densities up to 6 ρ0 •  Properties of resonance matter • in the vicinity of the phase transition •  In-medium properties of vector mesons •  Charm production mechanisms • at threshold beam energies •  Charm propagation in nuclear matter •  In-medium properties of D mesons •  Multi-strange objects • Observables: •  hadrons (incl. collective flow) •  Multi-strange hyperons •  Dilepton pairs •  D-mesons and charmonium in p+p and p+A collisions More observables to be discussed on this meetting

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