Abstract
Quarkonia are mesons formed of either a charm and anti-charm quark pair (J/ψ, ψ(2S)) or a beauty and anti-beauty quark pair (ϒ(1S), (2S) and (3S)). We report on forward rapidity (2:5 < y < 4) J/ψ and ψ(2S) production measured in pp collisions at √s = 13 TeV, using data collected at the LHC in 2015. The results will be compared with similar measurements performed at √s = 2.76, 5.02, 7 and 8 TeV. They will be further compared to NRQCD and FONLL calculations, which describe prompt and non-prompt charmonium production respectively. Results of the J/ψ nuclear modification factor as a function of collision centrality in p–Pb collisions at [see formula in PDF] = 8.16 TeV, at forward and backward rapidities, will also be presented. These measurements will be compared with Run-1 (2009 – 2013) results as well as theoretical calculations and will be interpreted in terms of cold nuclear matter effects.
Highlights
Measuring quarkonia in pp collisions may help to understand their production mechanisms and probe the parton distribution functions (PDF), in particular the gluon’s PDF down to low x
The ALICE quarkonium measurements presented in this document are inclusive which implies that no separation is made between prompt and non-prompt particles
The detector subsystems relevant to the present analysis are the muon spectrometer, the Silicon Pixel Detector (SPD) corresponding to the two innermost layers of the Inner Tracking System (ITS), the ZDC detectors, the V0 scintillator hodoscopes and the T0 Cherenkov detectors
Summary
Measuring quarkonia in pp collisions may help to understand their production mechanisms and probe the parton distribution functions (PDF), in particular the gluon’s PDF down to low x. These measurements provide a reference to p–Pb and Pb–Pb measurements which in turn are used to quantify the properties of the quark-gluon plasma. When we measure quarkonia we have contributions from decays from higher mass resonances and decays from b hadrons. The decay contributions are typically referred to as non prompt J/ψ and ψ(2S). The ALICE quarkonium measurements presented in this document are inclusive which implies that no separation is made between prompt and non-prompt particles
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