Production cross sections of Υ(1S), Υ(2S), and Υ(3S)states decaying into μ+μ−in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at √sNN=5.02 TeV. A comparison is made with corresponding cross sections obtained with ppdata measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for Υ(1S)is found to be RpPb(Υ(1S)) =0.806 ±0.024 (stat)±0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that RpPb(Υ(1S)) >RpPb(Υ(2S)) >RpPb(Υ(3S)). The suppression of all states is much less pronounced in pPbthan in PbPbcollisions, and independent of transverse momentum pΥTand center-of-mass rapidity yΥCMof the individual Υstate in the studied range pΥT<30GeV/cand |yΥCM| <1.93. Models that incorporate final-state effects of bottomonia in pPb collisions are in better agreement with the data than those which only assume initial-state modifications.

Nuclear modification of Y states in pPb collisions at sNN=5.02TeV

Miniello, G.;
2022

Abstract

Production cross sections of Υ(1S), Υ(2S), and Υ(3S)states decaying into μ+μ−in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at √sNN=5.02 TeV. A comparison is made with corresponding cross sections obtained with ppdata measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for Υ(1S)is found to be RpPb(Υ(1S)) =0.806 ±0.024 (stat)±0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that RpPb(Υ(1S)) >RpPb(Υ(2S)) >RpPb(Υ(3S)). The suppression of all states is much less pronounced in pPbthan in PbPbcollisions, and independent of transverse momentum pΥTand center-of-mass rapidity yΥCMof the individual Υstate in the studied range pΥT<30GeV/cand |yΥCM| <1.93. Models that incorporate final-state effects of bottomonia in pPb collisions are in better agreement with the data than those which only assume initial-state modifications.
2022
Istituto di Tecnologie Biomediche - ITB
Particle Physics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/537930
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