Production of inclusive ϒ(1S) and ϒ(2S) in p–Pb collisions at [formula omitted

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doi:10.1016/j.physletb.2014.11.041

Abstract

We report on the production of inclusive ϒ(1S) and ϒ(2S) in p–Pb collisions at sNN=5.02 TeV at the LHC. The measurement is performed with the ALICE detector at backward (−4.46<ycms<−2.96) and forward (2.03<ycms<3.53) rapidity down to zero transverse momentum. The production cross sections of the ϒ(1S) and ϒ(2S) are presented, as well as the nuclear modification factor and the ratio of the forward to backward yields of ϒ(1S). A suppression of the inclusive ϒ(1S) yield in p–Pb collisions with respect to the yield from pp collisions scaled by the number of binary nucleon–nucleon collisions is observed at forward rapidity but not at backward rapidity. The results are compared to theoretical model calculations including nuclear shadowing or partonic energy loss effects.

Highlights

Quarkonia are bound states of a heavy quark and its anti-quark
The recent measurement by the ALICE Collaboration in Pb–Pb collisions of a stronger Υ (1S) suppression at forward rapidity [38] than at midrapidity has stressed the importance of understanding CNM effects on Υ production
The RpPb shows a suppression of the inclusive Υ (1S) production yields at forward rapidity in p–Pb compared to pp collisions

Summary

Introduction

Quarkonia are bound states of a heavy quark and its anti-quark. The J/ψ family is comprised of charm and anti-charm quarks and the Υ family of bottom and anti-bottom quarks. Due to the larger mass of the bottomonium states compared to the charmonium ones, the measurement of Υ production in proton–nucleus collisions allows a study of cold nuclear matter effects in a different kinematic regime, complementing the J/ψ studies [36,37]. The recent measurement by the ALICE Collaboration in Pb–Pb collisions of a stronger Υ (1S) suppression at forward rapidity [38] than at midrapidity has stressed the importance of understanding CNM effects on Υ production (since in the colour screening scenario such a behaviour is not expected as the energy density should be larger or equal at mid-rapidity than at forward rapidity). The ratio of the forward to backward yields is discussed

Experimental apparatus and data sample

Data analysis

Results

Findings

Conclusion