The production of ϒ(nS) mesons (n = 1; 2; 3) in pPb and Pbp collisions at a centre-of-mass energy per nucleon pair √sNN = 8.16TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb-1. The ϒ(nS) mesons are reconstructed through their decays into two opposite-sign muons. The measurements comprise the differential production cross-sections of the ϒ(1S) and ϒ(2S) states, their forward-to-backward ratios and nuclear modi fi cation factors. The measurements are performed as a function of the transverse momentum pT and rapidity in the nucleon-nucleon centre-of-mass frame y* of the ϒ(nS) states, in the kinematic range pT < 25 GeV/c and 1.5 < y* < 4.0 (-5.0 < y* < -2.5) for pPb (Pbp) collisions. In addition, production cross-sections for ϒ(3S) are measured integrated over phase space and the production ratios between all three ϒ(nS) states are determined. Suppression for bottomonium in proton-lead collisions is observed, which is particularly visible in the ratios. The results are compared to theoretical models.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2018). Study of ϒ production in pPb collisions at √sNN=8.16 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(11) [10.1007/JHEP11(2018)194].

Study of ϒ production in pPb collisions at √sNN=8.16 TeV

Belloli, N.;Calvi, M.;Carniti, P.;Cassina, L.;Fazzini, D.;Gotti, C.;Martinelli, M.;Matteuzzi, C.;Petruzzo, M.;
2018

Abstract

The production of ϒ(nS) mesons (n = 1; 2; 3) in pPb and Pbp collisions at a centre-of-mass energy per nucleon pair √sNN = 8.16TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb-1. The ϒ(nS) mesons are reconstructed through their decays into two opposite-sign muons. The measurements comprise the differential production cross-sections of the ϒ(1S) and ϒ(2S) states, their forward-to-backward ratios and nuclear modi fi cation factors. The measurements are performed as a function of the transverse momentum pT and rapidity in the nucleon-nucleon centre-of-mass frame y* of the ϒ(nS) states, in the kinematic range pT < 25 GeV/c and 1.5 < y* < 4.0 (-5.0 < y* < -2.5) for pPb (Pbp) collisions. In addition, production cross-sections for ϒ(3S) are measured integrated over phase space and the production ratios between all three ϒ(nS) states are determined. Suppression for bottomonium in proton-lead collisions is observed, which is particularly visible in the ratios. The results are compared to theoretical models.
Articolo in rivista - Articolo scientifico
Heavy Ion Experiments
English
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2018). Study of ϒ production in pPb collisions at √sNN=8.16 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(11) [10.1007/JHEP11(2018)194].
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