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Feasibility of J/ ψ studies by MPD detector

Feasibility of J/ ψ studies by MPD detector. Alla Maevskaya, Alexei Kurepin INR RAS Moscow NICA Roundtable Workshop 11 September 2009. Charm production at threshold. CBM ( NICA ) will measure charm production at threshold

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Feasibility of J/ ψ studies by MPD detector

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  1. Feasibility of J/ψ studies by MPD detector Alla Maevskaya, Alexei Kurepin INR RAS Moscow NICA Roundtable Workshop 11 September 2009

  2. Charm production at threshold • CBM (NICA) will measure charm production at threshold • → after primordial production, the survival and momentum of the charm quarks depends on the interactions with the dense and hot medium! • → direct probe of the medium! [W. Cassing et al., Nucl. Phys. A 691 (2001) 753] • charmonium in hot and dense matter? • relation to deconfinement? • relation to open charm? HSD simulations Claudia Höhne Quark Matter Conference India, February 2008

  3. Generators [CBM TSR 2005 p371] Signal: 10000 J/ψ generated by HSD √s = 7 AGeV multiplicity 1.910-5 √s = 9 AGeV multiplicity 810-5 Background : 6400 central Au+Au events UrQMD √s = 7 AGeV & 9 AGeV Multiplicity of D0, D+, D- and J/ψ predicted for central Au+Au collisions as function of beam energy by the HSD model Alla Maevskaya INR RAS NICA Roundtable Workshop 11 September 2009

  4. Simulation environment MpdRoot from end of May 2009 Set-up: IT TPC TOF ECAL MC tracks in TPC acceptance with Y<1.2 Mass resolution assumed 1% Alla Maevskaya INR RAS NICA Roundtable Workshop 11 September 2009

  5. J/ψ distributions for √s = 9 AGeV Registeredin TPC HSD momentum transverse momentum rapidity Alla Maevskaya INR RAS NICA Roundtable Workshop 11 September 2009

  6. J/ψ distributions for √s = 7AGeV Registered in TPC HSD momentum transverse momentum rapidity Alla Maevskaya INR RAS NICA Roundtable Workshop 11 September 2009

  7. Background sources 6400 UrQMD Au+Au central events √s =9AGeV J/ψ multiplicity ~8x10-5 Momentum and transverse momentum of J/ψ different background sources: π°Dalitz decay; misidentified pions, protons and kaons Alla Maevskaya INR RAS NICA Roundtable Workshop 11 September 2009

  8. Invariant mass spectra J/ψ + combinatorial background for different pions, kaons and protons suppression factors Suppression S/B in 3σ Beam energy7AGeV 9AGeV protons 10000 0.55 1.5 π & k 1000 protons 10000 2.0 8 π & k 10000 protons 50000 3.7 12 π & k 10000 J/ψ efficiency 55%55% Superevent technique was used for invariant mass of background, so 196 J/ψ were added to corresponding 40960000 (6400x6400) central events √s =9AGeV Alla Maevskaya INR RAS NICA Roundtable Workshop 11 September 2009

  9. Conclusions NICA will produce ~400 ( or up to 1000 if MPD efficiency wil be more than 10%) J/ψ per 10 weeks, so during long enough run period significant amount of particles could be collected and studies. J/ψ could be measured by MPD with existing set-up: TPC, TOF and ECAL together could provide background suppression as needed. Alla Maevskaya INR RAS NICA Roundtable Workshop 11 September 2009

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