Observation of chi_c and chi_b nuclear suppression via dilepton polarization measurements

Abstract

We demonstrate that it is possible to use the polarization of vector quarkonia, measured from dilepton event samples, as an instrument to study the suppression of chi_c and chi_b in heavy-ion collisions, where a direct determination of signal yields involving the identification of low-energy photons is essentially impossible. A change of the observed J/psi and Upsilon(1S) polarizations from proton-proton to central nucleus-nucleus collisions would directly reflect differences in the nuclear dissociation patterns of S and P states and may provide a strong indication for quarkonium sequential suppression in the quark-gluon plasma.

7 pages, 4 figures

References in corpus (8)

• J/psi Production vs Centrality, Transverse Momentum, and Rapidity in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Upsilon production at the Tevatron and the LHC
• QCD corrections to J/psi polarization of hadronproduction at Tevatron and LHC
• J/psi Production in sqrt (s_NN)= 200 GeV Cu+Cu Collisions
• J/psi production at high transverse momentum in p+p and Cu+Cu collisions at \sNN=200GeV
• Production of the Charmonium States chic_1 and chic_2 in Proton Nucleus Interactions at sqrt{s} = 41.6 GeV
• Model-independent constraints on the shape parameters of dilepton angular distributions
• Determination of chi_c and chi_b polarizations from dilepton angular distributions in radiative decays

Cited by in corpus (10)

• Heavy-flavour and quarkonium production in the LHC era: from proton-proton to heavy-ion collisions
• Suppression of non-prompt J/psi, prompt J/psi, and Y(1S) in PbPb collisions at sqrt(sNN) = 2.76 TeV
• Event activity dependence of Y(nS) production in sqrt(s[NN]) = 5.02 TeV pPb and sqrt(s) = 2.76 TeV pp collisions
• Measurement of the ratio of prompt ${\chi }_c$ to $J/\psi$ production in $pp$ collisions at $\sqrt{s}=7$ TeV
• Search for a new bottomonium state decaying to Upsilon(1S) pi+ pi- in pp collisions at sqrt(s) = 8 TeV
• Spin correlations in polarizations of P-wave charmonia ${\chi }_{cJ}$ and impact on $J/\psi$ polarization
• Prospects for quarkonium studies at the high-luminosity LHC
• Heavy-ion Physics at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC): Feasibility Studies for Quarkonium and Drell-Yan Production
• Questions and prospects in quarkonium polarization measurements from proton-proton to nucleus-nucleus collisions
• INFN What Next: Ultra-relativistic Heavy-Ion Collisions