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Hypernuclei Program at CBM Experiment HYP2015, Sendai, Japan

Explore QCD phase diagram, strange matter, hypernuclei, heavy multi-strange objects, particle production, deconfinement, and in-medium modifications. CBM physics program for FAIR energies.

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Hypernuclei Program at CBM Experiment HYP2015, Sendai, Japan

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  1. Hypernuclei program at the CBM experiment HYP2015, Sendai, Japan Vassiliev Iouri , CBM Collaboration TOF ECAL TRD RICH STS PSD • Outline • CBM physics • Motivation for HYP program • CBM tracking and particles ID • Multi-strange hyperons and • Hypernuclei simulation • Conclusion 1

  2. Physics case: Exploring the QCD phase diagram The equation-of-state at high B • collective flow of hadrons and HYPERnuclei • particle production at threshold energies (open charm) LHC RHIC Deconfinement phase transition at high B • excitation function and flow of strangeness (K, , , , ) and HYPERnuclei • excitation function and flow of charm • (J/ψ, ψ', D0, Ds, D, c) • charmoniumsuppression, forJ/ψ and ψ' SPS-CERN CBM QCD critical endpoint • excitation function of event-by-event fluctuations (K/π,  π,  π) Onset of chiral symmetry restoration at high B • in-medium modifications of hadrons (,,e+e-(μ+μ-)) Projects to explore the QCD phase diagram at large μB: RHIC energy-scan, NA61@SPS, MPD@NICAbulk observables CBM@FAIR/SIS-300bulk andrare observables, high statistic! 2

  3. Does strange matter exist in the form of heavy multi-strange objects? Motivation: How far can we extend the chart of nuclei towards the third (strange) dimension by producing single and double hypernuclei?  Hypernuclei ? CBM Au+Au -3 T. Bressani (2009) • new physics items: • search forH particle • neutron star composition • are there S=-2 deeply bound K(bar) states? • challenges: • (abundant) production of ΛΛ-hypernuclei is very difficult(CBM!) • identification of produced hypersystems is problematic (CBM!) • complex topology (is good for CBM!)

  4. CBM physics program III (P.Senger) Motivation: No data at FAIR energies Strange matter Hypernuclei, strange dibaryons and massive strange objects Production of hypernuclei via coalescence of hyperons and light nuclei CBM A. Andronic et al., Phys. Lett. B697 (2011) 203 H. Stöcker et al., Nucl. Phys. A 827 (2009) 624c

  5. Motivation: Hypernuclei, dibaryon and antinuclei production in high energy heavy ion collisions: Thermal production vs. Coalescence J. Steinheimer, K. Gudima, A. Botvina, I. Mishustin, M. Bleicher, H. Stöcker Phys. Lett. B714, 85, (2012) Lines: UrQMD + thermal hydrodynamics, symbols: DCM + coalescence

  6. I.Vassiliev, CBM Why CBM? FAIR will provide heavy-ion beam energies from 2 - 11(14) A GeV for Q = 0.4 A (0.5 A) nuclei with the SIS100 synchrotron, and 11 - 35 (45) A GeV with the SIS300 synchrotron. up to 107 Au+Au reactions/sec (J/ψ)  determination of (displaced) vertices with high resolution ( 50 m)  identification of leptons and hadrons  fast and radiation hard detectors  self-triggered readout electronics  high speed data acquisition and online event selection • powerful computing farm 4-d tracking* • software triggers

  7. CBM tracking: central Au+Au @ 25AGeV UrQMD 8 DS-strip Stations Low material budget (0.3-1 X0) High acceptance ~700  160 p 53 K 32  KS 0.44 - 0.018 - reconstruction CA track finder ~700  174 p 42 K 30  4KS 2.4 - 0.005 - low p tracks ! SIMDized tracking + KFParticle 648 reconstructed tracks Ref. prim. eff = 96% All set eff = 87% dp/p = 1.2% central: 82 (TF) + 16 (PF) ms/core mbias : 10 (TF) + 2 (PF) ms/core up to 80 cores/CPU

  8. CBM First Level Event Selection (FLES) The FLES package is vectorized, parallelized, portable and scalable up to 3200 cores Example: Full track reconstruction including KF particle analysis of multi-strange (anti) hyperons for min. bias Au+Au collisions at 25 A GeV. 100 nodes with 32 cores each Single node with up to 80 cores 220 k events/s ! FAIR-Russia HPC cluster at ITEP Moscow 8

  9. KF Particle Finder with ToF particle ID: Au+Au @ 10AGeV SIS100 165  170 p 26 K 15  20KS 0.3 - central: 40 (TF) + 8 (PF) ms/core mbias : 5 (TF) + 1 (PF) ms/core, up to 80 cores/CPU

  10. KF Particle Finder for the CBM Experiment (development)

  11. KF Particle Finder with ToF track ID: Au+Au @ 10AGeV SIS100 165  170 p 26 K 15  20KS 0.3 - pv

  12. UrQMD Au+Au 10 AGeV 5M central events eff =2.3% 12

  13. QGP signatures at FAIR energies: Multi-strange antibaryons E.Bratkovskaya fias.uni-frankfurt.de/~brat/PHSD/index1.html V. Vovchenko QGP 5M events/point GSI Farm 5M events/point GSI Farm Most of the + produced by QGP @ FAIR energy!?

  14. UrQMD Au+Au 10 AGeV 5M central events Extended KFParticle Finder 3H 5 second of data taking! STAR 2010 • eff = 19.2% • = 1.7 MeV • S/B ~ 1.5 BR from H. Kamada et al., Phys. Rev., Ser. C 57, 1595 (1998) M from J. Steinheimer et al., Phys. Lett. B714, 85, (2012) 14

  15. UrQMD Au+Au 10 AGeV 5M central events Extended KFParticle Finder (,N)bound 5 second of data taking! • eff = 28.9% • = 1.6 MeV • BR ~ 0.2 M from J. Steinheimer et al., Phys. Lett. B714, 85, (2012) UrQMD output do not contain deuterons ~ 5.6 d/event expected (no secondary d’s)! 15

  16. UrQMD Au+Au 10 AGeV 5M central events Extended KFParticle Finder 4He ~ 1 min. of data taking! STS MVD • eff = 14.7% • = 1.6 MeV • S/B ~ 50 • BR ~ 0.2 3 prong detached vertex is good signature of 4He decay M from J. Steinheimer et al., Phys. Lett. B714, 85, (2012) 16

  17. I.Vassiliev, CBM New horizons: ± reconstruction n • Σ+ and Σ− have only channels with at least one neutral daughter. • A lifetime is sufficient to be registered by the tracking system: cτ = 2.4 cm for Σ+ and cτ = 4.4 cm for Σ−. • Can not to be identified by the PID detectors. • Identification is possible by the decay topology: Σ- π- 2. Reconstruct a neutral daughter from the mother and the charged daughter 3. Reconstruct Σ mass spectrum from the charged and obtained neutral daughters 1. Find tracks of Σ and its daughter in STS and MVD

  18. Strange and Hyper matter in the Lab s s u d s u Λ ? Λ Does strange matter exist in the form of heavy multi-strange objects?

  19. Summary: • CBM detector is an excellent device to measure not only bulk observables, but strangeness, Hypernucleiand other rare probes with high statistic. Plans: 6He and neutral fragment decay channels. 19

  20. I.Vassiliev, CBM Thank you very much! Join CBM! どうもありがとうございました

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