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.

arXiv comment21 pages, 4 captioned figures, 4 tables, authors from page 16, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/903

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