Upsilon cross section in p+p collisions at sqrt(s) = 200 GeV

Abstract

We report on a measurement of the Upsilon(1S+2S+3S) -> e+e- cross section at midrapidity in p+p collisions at sqrt(s)=200 GeV. We find the cross section to be 114 +/- 38 (stat.) +23,-24 (syst.) pb. Perturbative QCD calculations at next-to-leading order in the Color Evaporation Model are in agreement with our measurement, while calculations in the Color Singlet Model underestimate it by 2 sigma. Our result is consistent with the trend seen in world data as a function of the center-of-mass energy of the collision and extends the availability of Upsilon data to RHIC energies. The dielectron continuum in the invariant mass range near the Upsilon is also studied to obtain a combined cross section of Drell-Yan plus (b b-bar) -> e+e-.

17 pages, 14 figures, STAR Collaboration

References in corpus (6)

• Color Screening Melts Quarkonium
• QCD corrections to J/psi and Upsilon production at hadron colliders
• Statistical hadronization of heavy quarks in ultra-relativistic nucleus-nucleus collisions
• Can quarkonia survive deconfinement ?
• Heavy flavor in heavy-ion collisions at RHIC and RHIC II
• Heavy-Quarkonium Production in High Energy Proton-Proton Collisions at RHIC

Cited by in corpus (16)

• Heavy quarkonium: progress, puzzles, and opportunities
• Suppression of non-prompt J/psi, prompt J/psi, and Y(1S) in PbPb collisions at sqrt(sNN) = 2.76 TeV
• Suppression of Upsilon excited states in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV
• Bottomonia in the Quark-Gluon Plasma and their Production at RHIC and LHC
• Suppression of Upsilon Production in d+Au and Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Heavy Quarkonium moving in a Quark-Gluon Plasma
• Quarkonium Physics at a Fixed-Target Experiment using the LHC Beams
• High $p_T$ non-photonic electron production in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV
• Upsilon (1S+2S+3S) production in d+Au and p+p collisions at sqrt(s_NN)=200 GeV and cold-nuclear matter effects
• Upsilon production in U+U collisions at 193 GeV with the STAR experiment
• Measurement of sequential ${\rm Y}$ suppression in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 200 GeV with the STAR experiment
• Measuring the Upsilon Nuclear Modification Factor at STAR
• From production to suppression, a critical review of charmonium measurements at RHIC
• Upsilon production in pp and pA collisions: from RHIC to the LHC
• Quarkonium Production at STAR
• Upsilon Productions at STAR