Abstract
The production cross-sections of ϒ(1S), ϒ(2S) and ϒ(3S) mesons in proton-proton collisions at sqrt{s}=13 TeV are measured with a data sample corresponding to an integrated luminosity of 277 ± 11 pb−1 recorded by the LHCb experiment in 2015. The ϒ mesons are reconstructed in the decay mode ϒ → μ+μ−. The differential production cross-sections times the dimuon branching fractions are measured as a function of the ϒ transverse momentum, pT, and rapidity, y, over the range 0 < pT< 30 GeV/c and 2.0 < y < 4.5. The ratios of the cross-sections with respect to the LHCb measurement at sqrt{s}=8 TeV are also determined. The measurements are compared with theoretical predictions based on NRQCD.
Highlights
Order NRQCD theory predictions [21], and the ratios as a function of rapidity show a different trend than the predictions [22, 23]
The measurement performed at 13 TeV presented here provides valuable input to study the quarkonium production at a higher centre-of-mass energy, enabling ratios to be determined with respect to data taken at a lower centre-ofmass energy
The data sample used in this measurement corresponds to an integrated luminosity of 277 ± 11 pb−1 of pp collisions at a centre-of-mass energy of 13 TeV collected during 2015
Summary
The LHCb detector [25, 26] is a single-arm forward spectrometer covering the pseudorapidity range 2 < η < 5, designed for the study of particles containing b or c quarks. The online event selection is performed by a trigger system [31] that consists of a hardware stage selecting dimuon candidates with the product of the transverse momenta of the muons greater than (1.3 GeV/c), followed by a two-stage software selection based on the information available after full event reconstruction. Two muons with p > 6 GeV/c, pT > 300 MeV/c are selected to form a Υ candidate. The consistency and high-quality of the tracking and particle identification information between the trigger and offline software. The Υ candidates are further selected offline by requiring two well identified muon candidates with transverse momentum larger than 1 GeV/c, and momentum larger than 10 GeV/c. The Geant toolkit [39] is used to describe the interactions of the generated particles with the detector and its response
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