Abstract
Quarkonia constitute a sensitive probe of the hot and dense matter created in heavy-ion collisions at high energy. Bottomonium states are particularly interesting because they cannot be produced from the decay of long lived hadrons and their production from statistical hadronization or kinetic regeneration is expected to be marginal. They represent therefore a unique tool to probe the deconfined phase produced in heavy-ion collisions. We present Υ measurements obtained with the ALICE muon spectrometer in pp collisions at √ s = 7 TeV, in p–Pb collisions at √s NN = 5.02 TeV and in Pb–Pb collisions at √s NN = 2.76 TeV. Results are obtained in the rapidity range 2.5 lab < 4 and down to zero transverse momentum. They are compared to other LHC data and to model predictions.
Highlights
At LHC energies, heavy-quarks Q are produced in initial hard processes, mainly via gluon fusion g g → Q Q
This effect is expected to be negligible for bottomonium states, contrarily to charmonium states, because of the much lower production rate of b quarks compared to c quarks [5]
The ALICE detector [10] is equipped with a muon spectrometer designed to study heavy-flavour and quarkonium production at forward rapidity in themuon channel
Summary
At LHC energies, heavy-quarks Q are produced in initial hard processes, mainly via gluon fusion g g → Q Q. Since the various quarkonium states have different binding energy, their suppression depends on the temperature of the medium [2] This makes quarkonium production in heavy-ion collisions a QGP-thermometer. The large production of heavy-quark pairs in high-energy heavy-ion collisions can lead to a statistical regeneration of quarkonia [3, 4] This effect is expected to be negligible for bottomonium states, contrarily to charmonium states, because of the much lower production rate of b quarks compared to c quarks [5]. This is achieved by studying quarkonium production in proton-nucleus (p–A) collisions
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