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J/Psi in di-electron channel

This report presents findings from the CBM collaboration meeting held on March 11, 2005, in Darmstadt. We focus on the J/Psi mesons produced in Au+Au collisions at 25AGeV, analyzing the transverse momentum and rapidity distributions. We discuss sources of background, pion suppression factors, and simulate various conditions, including mass resolution and different Pt cuts. The calculations for J/Psi kinematics were performed using PLUTO and HSD. Moreover, we investigate the signal-to-background ratios and propose future directions for more realistic J/Psi generation studies.

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J/Psi in di-electron channel

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  1. J/Psi in di-electron channel Alla Maevskaya Institute for Nuclear Research RAS, Moscow CBM collaboration meeting 11 March 2005 GSI Darmstadt

  2. Outlook • For Au+Au 25AGeV collisions • J/Ψ momenta and rapidity spectra • Background sources • Simulation in different conditions: • pion suppression factors • applying different Pt cuts • applying different mass resolution • For central and mbias collisions • For different beam energies • Conclusions Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  3. Au+Au 25AGeV: Transverce momenta and rapidity distribution for J/Psi mesons. • all J/ψ • accepted in detector • with Pt >1GeV/c Calculations was done by PLUTO for generation J/ψkinematics and cbmroot version OCT04 for transport. J/ψ multiplicity was obtained according HSD predictions Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  4. Au+Au 25AGeV central:Tranverse momenta distribution for e+e- from different background sources Background electrons from γ, π0, η & misidentified charged pions (suppression 10-4) were obtained from UrQMD generator + cbmroot vOCT04, STS + RICH +TRD in, field "FIELD.v04_pavel.map" open charm was calculated by V.Friese code by Goran; J/ψ momentum distribution - by PLUTO, multiplicity – by HSD Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  5. Au+Au 25AGeV central:invariant mass spectra for 2x1010 events with cut Pt>1GeV and different pion suppression factors : 10-2; 10-3;10-4 ; no pions ψ For pion suppression 10-4 and different Pt cuts Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  6. Au+Au 25AGeV central Invariant mass spectra for different mass resolution scenario Pt > 1GeV/c 90 MeV J/ψ mass resolution 30 MeV 150 MeV Pt > 1.3 GeV/c Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  7. Au+Au 25AGeV mbias Invariant mass spectra for different mass resolution scenario Pt > 1GeV/c 5% -150 MeV Pt > 1.3 GeV Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  8. Au+Au 25AGeV : Signal /Background ratio dependance on mass resolution, Pt cuts and centrality Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  9. Signal/Background and J/Psi efficiency for central Au+Au collisions at 15, 25 and 35 AGeV Alla Maevskaia INR RAS Moscow CBM collaboration meeting 11 March 2005

  10. To be done : “realistic” J/ψ generation using HSD and PYTHIA Investigation of ψ' ??? Centrality dependence of the statistical significance Normalisation of J/ψcross section ??? Using reconstructed tracks for signal and background calculations

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