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CERN Heavy Ion Forum
Quarkonia production at RHIC and LHC
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Europe/Zurich
13/2-005 (CERN)
Description
1. J/psi production in p+p, d+A and A+A collisions at sqrt(s_NN) = 200 GeV by the PHENIX experiment at RHIC
by Hugo Pereira Da Costa (CEA, Saclay)
The formation of a quark gluon plasma in ultra relativistic heavy ion collisions is expected to affect the production of heavy quarkonia via competing mechanisms such as color screening or quark coalescence. The PHENIX collaboration at RHIC has measured the J/psi production at both forward and mid-rapidity for reference systems consisting of at least one light nucleus (p+p and d+Au) and for symmetric heavy systems (Cu+Cu and Au+Au). After a brief description of the PHENIX apparatus and analysis technique, the J/psi production yields measured with the reference systems are presented as a function of the J/psi transverse momentum and rapidity. They are extrapolated to the heavy systems using different approaches, and compared to the preliminary results obtained with these systems. A few comparisons to theoretical models are also discussed.
2. Perspectives for heavy flavour physics in the ALICE detector
by Gines Martinez (Subatech, Nantes)
Heavy flavor production in nucleus nucleus collisions at LHC energies will probe the quark gluon plasma. ALICE combines electronic, muonic and hadronic channels for studying heavy flavour production at high and low transverse momentum in Pb+Pb collisions at 5.5 TeV. Physics analysis foreseen by the ALICE detector wil be presented.
3. Heavy quarkonia in ATLAS
by Laurent Rosselet (CERN)
The ATLAS experiment is designed for the study of proton-proton collisions at the LHC. We report on an evaluation of the ATLAS capabilities to study heavy quarkonia in Pb-Pb collisions. Most of the detector subsystems retain their nearly full capability even in the presence of high-multiplicity soft background from nucleus-nucleus collisions. These studies show that upsilon and J/psi suppression, which provides crucial information about the formation of a deconfined state, is accessible to ATLAS.
4. Quarkonia production in heavy-ion collisions with CMS at LHC
by Bolek Wyslouch, MIT
The observation of anomalous J/ψ suppression at the CERN-SPS has focussed attention on quarkonia production as an important signature of quark-gluon plasma formation. Nuclear collisions with √sNN= 5.5 TeV at the LHC will allow CMS to extend the study of the J/ψ suppression pattern to higher energies. Furthermore, studies of the ϒ family may provide a cleaner picture of the suppression mechanism. We report the capabilities of the CMS detector to study quarkonia production through the dimuon decay channel. The CMS muon acceptance is broad in the central region, |η|<2.4, and, thanks to the powerful tracking system and 4T magnetic field, the dimuon mass resolution is about 54 (90) MeV at the ϒ mass as measured in the barrel (barrel+endcap). The most recent estimates of the quarkonia and heavy flavour cross sections are used in the simulations. Dimuon mass spectra, signal/background ratios, and the expected statistics are presented for the J/ψ and the ϒ family.
5. Quarkonia production via statistical recombination: analysis of RHIC data and predictions for LHC
by Peter Braun-Munzinger (GSI)
In this talk the statistical recombination model will be used to analyze charmonium data from RHIC. Emphasis is placed on rapidity and pt distributions, as well as on the dependence of the production yield on centrality and system size. Using a pQCD inspired extrapolation of the open charm cross section to LHC energy predictions will be made concerning charmonia production in PbPb collisions at sqrt(s_nn)= 5.5 TeV.
Organiser(s): Yiota Foka and Nicolas Borghini
More information: http://home.cern.ch/a/alicedoc/www/chic/
by Hugo Pereira Da Costa (CEA, Saclay)
The formation of a quark gluon plasma in ultra relativistic heavy ion collisions is expected to affect the production of heavy quarkonia via competing mechanisms such as color screening or quark coalescence. The PHENIX collaboration at RHIC has measured the J/psi production at both forward and mid-rapidity for reference systems consisting of at least one light nucleus (p+p and d+Au) and for symmetric heavy systems (Cu+Cu and Au+Au). After a brief description of the PHENIX apparatus and analysis technique, the J/psi production yields measured with the reference systems are presented as a function of the J/psi transverse momentum and rapidity. They are extrapolated to the heavy systems using different approaches, and compared to the preliminary results obtained with these systems. A few comparisons to theoretical models are also discussed.
2. Perspectives for heavy flavour physics in the ALICE detector
by Gines Martinez (Subatech, Nantes)
Heavy flavor production in nucleus nucleus collisions at LHC energies will probe the quark gluon plasma. ALICE combines electronic, muonic and hadronic channels for studying heavy flavour production at high and low transverse momentum in Pb+Pb collisions at 5.5 TeV. Physics analysis foreseen by the ALICE detector wil be presented.
3. Heavy quarkonia in ATLAS
by Laurent Rosselet (CERN)
The ATLAS experiment is designed for the study of proton-proton collisions at the LHC. We report on an evaluation of the ATLAS capabilities to study heavy quarkonia in Pb-Pb collisions. Most of the detector subsystems retain their nearly full capability even in the presence of high-multiplicity soft background from nucleus-nucleus collisions. These studies show that upsilon and J/psi suppression, which provides crucial information about the formation of a deconfined state, is accessible to ATLAS.
4. Quarkonia production in heavy-ion collisions with CMS at LHC
by Bolek Wyslouch, MIT
The observation of anomalous J/ψ suppression at the CERN-SPS has focussed attention on quarkonia production as an important signature of quark-gluon plasma formation. Nuclear collisions with √sNN= 5.5 TeV at the LHC will allow CMS to extend the study of the J/ψ suppression pattern to higher energies. Furthermore, studies of the ϒ family may provide a cleaner picture of the suppression mechanism. We report the capabilities of the CMS detector to study quarkonia production through the dimuon decay channel. The CMS muon acceptance is broad in the central region, |η|<2.4, and, thanks to the powerful tracking system and 4T magnetic field, the dimuon mass resolution is about 54 (90) MeV at the ϒ mass as measured in the barrel (barrel+endcap). The most recent estimates of the quarkonia and heavy flavour cross sections are used in the simulations. Dimuon mass spectra, signal/background ratios, and the expected statistics are presented for the J/ψ and the ϒ family.
5. Quarkonia production via statistical recombination: analysis of RHIC data and predictions for LHC
by Peter Braun-Munzinger (GSI)
In this talk the statistical recombination model will be used to analyze charmonium data from RHIC. Emphasis is placed on rapidity and pt distributions, as well as on the dependence of the production yield on centrality and system size. Using a pQCD inspired extrapolation of the open charm cross section to LHC energy predictions will be made concerning charmonia production in PbPb collisions at sqrt(s_nn)= 5.5 TeV.
Organiser(s): Yiota Foka and Nicolas Borghini
More information: http://home.cern.ch/a/alicedoc/www/chic/