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

Abstract: Production cross sections of ?(1S), ?(2S), and ?(3S) states decaying into ?+?? 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 pp data measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for ?(1S) is found to be RpPb(?(1S)) = 0.806±0.024 (stat)±0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that RpPb(?(1S)) > RpPb(?(2S)) > RpPb(?(3S)). The suppression of all states is much less pronounced in pPb than in PbPb collisions, and independent of transverse momentum p ? T and center-of-mass rapidity y ? CM of the individual ? state in the studied range p ? T < 30 GeV/c and |y ? 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

Authorship: Tumasyan A., Adam W., Ambrogi F., Bergauer T., Dragicevic M., Erö J., Escalante Del Valle A., Flechl M., Frühwirth R., Jeitler M., Krammer N., Krätschmer I., Liko D., Madlener T., Mikulec I., Rad N., Schieck J., Schöfbeck R., Spanring M., Waltenberger W., Wulz C.E., Zarucki M., Drugakov V., Mossolov V., Suarez Gonzalez J., Darwish M.R., De Wolf E.A., Di Croce D., Janssen T., Kello T., Lelek A., Pieters M., Rejeb Sfar H., Van Haeve

Fuente: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2022, 835, 137397

Publisher: Elsevier

Year of publication: 2022

No. of pages: 28

Publication type: Article

DOI: 10.1016/j.physletb.2022.137397

ISSN: 0370-2693,1873-2445

Publication Url: https://doi.org/10.1016/j.physletb.2022.137397

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