Nuclear modification of Y states in pPb collisions at &lt;strong&gt;√&lt;/strong&gt;s&lt;sub&gt;&lt;sub&gt;NN&lt;/sub&gt;&lt;/sub&gt; = 5.02TeV

Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Flechl, M.; Frühwirth, R.; Jeitler, M.; Caminada, L.; Deiters, K.; Erdmann, W.; Horisberger, R.; Ingram, Q.; Kaestli, H.C.; Kotlinski, D.; Langenegger, U.; Rohe, T.; Trembath-Reichert, S.

doi:10.1016/j.physletb.2022.137397

Nuclear modification of Y states in pPb collisions at √s_{_NN} = 5.02TeV

Tumasyan A, Adam W, Ambrogi F, Bergauer T, Dragicevic M, Erö J, Escalante Del Valle A, Flechl M, Frühwirth R, Jeitler M, Caminada L, Deiters K, Erdmann W, Horisberger R, Ingram Q, Kaestli HC, Kotlinski D, Langenegger U, Rohe T, Trembath-Reichert S, et al.

Citation

Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., Erö, J., … Trembath-Reichert, S. (2022). Nuclear modification of Y states in pPb collisions at √s_{_NN} = 5.02TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 835, 137397 (28 pp.). https://doi.org/10.1016/j.physletb.2022.137397

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:48200

Production cross sections of Y(1S), Y(2S) and Y(3S) states decaying into μ⁺μ⁻ in proton-lead () collisions are reported using data collected by the CMS experiment at s_{_NN} = 5.02 TeV. A comparison is made with corresponding cross sections obtained with data measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for Y (1S) is found to be R_pPb(Υ(1S)) = 0.806 ±0.024 (stat)±0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that R_pPb(Υ(1S)) > R_pPb(Υ(2S)) > R_pPb(Υ(3S)). The suppression of all states is much less pronounced in than in PbPb collisions, and independent of transverse momentum p^Υ_TY and center-of-mass rapidity y^Υ_CM of the individual 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.