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Feasibility of hyperons study with ECAL

Feasibility of hyperons study with ECAL. Sergey Kiselev, ITEP Moscow, for the ECAL group Introduction Motivation Input info and assumptions Spectra Acceptance Multiplicity Signal Signal + Background Conclusions and next steps. Introduction. Hyperons with “neutral” decay modes:

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Feasibility of hyperons study with ECAL

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  1. Feasibility of hyperons study with ECAL • Sergey Kiselev, ITEP Moscow, for the ECAL group • Introduction • Motivation • Input info and assumptions • Spectra • Acceptance • Multiplicity • Signal • Signal + Background • Conclusions and next steps Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  2. Introduction • Hyperons with “neutral” decay modes: • Σ-(dds)  n- Br=99.8% c=4.4 cm • Σ+(uus)  p o Br=51.6% c=2.4 cm Σ+(uus)  n+ Br=48.3% • Σo (uds) Λ Br=100% c=2.2 10-9 cm • o(uss)  Λo Br=99.5% c=8.71 cm • p, -, +, Λ p -can be identified by TOF. • , n, o   can be identified by ECAL. • Measurements with the CBM (Compressed Baryonic Matter) detector will be analyzed. Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  3. Introduction - the CBM detector Tracking: STS, TRD Vertexing: STS Hadron ID : TOF Electron ID: RICH, TRD, ECAL , neutral m, n: ECAL Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  4. Motivation - 1 • The pronouncedkink structure in the K+/+ ratio has caused speculations on a possible deconfinement phase transitionaround 30 AGeV • Which part of Λ is from the channel Σo Λ? • How do Σ+ΣoΣ-excitation functions look like? Excitation function of strangeness production in central Au+Au and Pb+Pb collisions. Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  5. Motivation - 2 • Hyperon-hyperon interactions: • to verify various ideas on baryon-baryon interactions such as the flavor SU(3) symmetry • to clarify the properties of dense nuclear matter like neutron stars, in which abundant hyperons are expected to exist • Experimental method – momentum correlations between strange baryons. baryon octet matrix Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  6. Input info and assumptions • CbmRoot package (04.10.2004), Geant3 • 105 UrQMD Au+Au central events at 25 AGeV • TOF: • p, -: ideal tracking and PID, momentum resolution 1%, impact parameter cut b>0.1 cm, cross last 4 STS tracking stations (Zvtx < 40 cm) • ideal Λ p -reconstruction; • ECAL: • : ideal PID, energy resolution 3%/√E, 6%/√E, 9%/√E • n: ideal PID, momentum from ECAL time v=L/t, dp/p = (1+(p/m)2)dL/L, time resolution 0.2, 0.4, 0.6, 0.8 ns dp/p = (1+(p/m)2)dt/t • ideal o   reconstruction Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  7. Σ- n-: spectra Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  8. Σ- n-: acceptance Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  9. Σ- n-: multiplicity Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  10. Σ- n-: signal Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  11. Σ- n-: signal+background Σ- n-: signal + background Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  12. Σ+ po: spectra Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  13. Σ+ po: acceptance Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  14. Σ+ po: multiplicity Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  15. Σ+ po: signal Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  16. Σ+ po: signal + background Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  17. Σo Λ: spectra Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  18. Σo Λ: acceptance Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  19. Σo Λ: multiplicity and cuts Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  20. Σo Λ: signal Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  21. Σo Λ: signal + background Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

  22. Conclusions and next steps • Conclusions: • S/B=0.1 – 0.3 %, needed statistics >107 • Σ-, Σ+, Σo can be reconstructed with ECAL by the event-mixing technique • S/B(Σ+ p o) > S/B(Σ+ n +) • Next steps: • o Λo • More realistic simulations: tracking, PID, reconstruction Workshop of European Research Group on Ultrarelativistic Heavy Ion Physics. Dubna-ITEP S.Kiselev

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