Production cross sections of Υ (1S), Υ (2S), and Υ(3S) states decaying into mu+ mu- in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at root sNN=5.02TeV. A comparison is made with corresponding cross sections obtained with pp data 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 pPb than in PbPb collisions, and independent of transverse momentum p^Υ_T and center-of-mass rapidity y^Υ_CM of the individual Υ state in the studied range p^Υ_T <30GeV/c and |y^Υ_CM|< 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 The Author(s)
Nuclear modification of Y states in pPb collisions at sNN=5.02TeV
Musich, M.;Asenov, P.;Bianchini, L.;Ciocci, M. A.;Donato, S.;Messineo, A.;Rizzi, A.;Tonelli, G.;Bossini, E.;Marini, A. C.;
2022-01-01
Abstract
Production cross sections of Υ (1S), Υ (2S), and Υ(3S) states decaying into mu+ mu- in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at root sNN=5.02TeV. A comparison is made with corresponding cross sections obtained with pp data 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 pPb than in PbPb collisions, and independent of transverse momentum p^Υ_T and center-of-mass rapidity y^Υ_CM of the individual Υ state in the studied range p^Υ_T <30GeV/c and |y^Υ_CM|< 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 The Author(s)File | Dimensione | Formato | |
---|---|---|---|
1-s2.0-S0370269322005317-main.pdf
accesso aperto
Tipologia:
Versione finale editoriale
Licenza:
Creative commons
Dimensione
1.23 MB
Formato
Adobe PDF
|
1.23 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.