Suppression of ${\rm Y}$(1S) at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

Abstract

We report on the measurement of the inclusive ${\rm Y}$(1S) production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV carried out at forward rapidity ($2.5<y<4$) and down to zero transverse momentum using its ${\mu }^{+}{\mu }^{-}$ decay channel with the ALICE detector at the Large Hadron Collider. A strong suppression of the inclusive ${\rm Y}$(1S) yield is observed with respect to pp collisions scaled by the number of independent nucleon-nucleon collisions. The nuclear modification factor, for events in the 0-90$\%$ centrality range, amounts to $0.30\pm 0.05(\mathrm{stat})\pm 0.04(\mathrm{syst})$. The observed ${\rm Y}$(1S) suppression increases with the centrality of the collision and is more pronounced than in corresponding mid-rapidity measurements. Our results are compared with model calculations, which are found to underestimate the measured suppression and fail to reproduce its rapidity dependence.

21 pages, 4 captioned figures, 4 tables, authors from page 16, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/903

References in corpus (5)

• J/psi Production vs Centrality, Transverse Momentum, and Rapidity in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Observation of sequential Upsilon suppression in PbPb collisions
• Color Screening Melts Quarkonium
• J/psi production at high transverse momentum in p+p and Cu+Cu collisions at \sNN=200GeV
• Measurement of the polarization of the ${\rm Y}(1S)$ and ${\rm Y}(2S)$ states in $p\bar{p}$ collisions at $\sqrt{s}=$1.96 TeV

Cited by in corpus (6)

• Production of inclusive ${\rm Y}$(1S) and ${\rm Y}$(2S) in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV
• Bottomium suppression in PbPb collisions at LHC energies
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: hard probes
• NRQCD based S- and P-wave bottomonium spectra at finite temperature from $48^3\times 12$ lattices with $N_f=2+1$ light HISQ flavors
• Quarkonia suppression in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV
• Lattice NRQCD study on in-medium bottomonium spectra using a novel Bayesian reconstruction approach