Nuclear modification of Y states in pPb collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msqrt><mml:mrow><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:msub><mml:mrow/><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo linebreak="goodbreak" linebreakstyle="after">=</mml:mo><mml:mn>5.02</mml:mn><mml:mspace width="0.2em"/><mml:mtext>TeV</mml:mtext></mml:math>
A. Tumasyan, W. Adam, F. Ambrogi, T. Bergauer, M. Dragicevic, János Erö, A. Escalante Del Valle, M. Flechl, R. Frühwirth, M. Jeitler, Natascha Krammer, I. Krätschmer, D. Liko, T. Madlener, I. Mikulec, N. Rad, J. Schieck, R. Schöfbeck, Markus Spanring, W. Waltenberger, C.-E. Wulz, M. Zarucki, Vladimir Drugakov, V. Mossolov, J. Suarez Gonzalez, M. R. Darwish, E. A. De Wolf, D. Di Croce, X. Janssen, Tomáš Kello, A. Lelek, M. Pieters, Haifa Rejeb Sfar, Hans van Haevermaet, P. Van Mechelen, S. Van Putte, N. Van Remortel, F. Blekman, E. S. Bols, S. S. Chhibra, J. D’Hondt, Jarne de Clercq, D. Lontkovskyi, S. Lowette, I. Marchesini, S. Moortgat, Q. Python, S. Tavernier, Walter Van Doninck, P. Van Mulders, Diego Beghin, B. Bilin, B. Clerbaux, G. De Lentdecker, H. Delannoy, B. Dorney, L. Favart, A. Grebenyuk, A. K. Kalsi, L. Moureaux, A. Popov, Nicolas Postiau, E. Starling, Laurent Thomas, C. Vander Velde, P. Vanlaer, D. Vannerom, T. Cornelis, D. Dobur, I. Khvastunov, M. Niedziela, C. Roskas, K. Skovpen, M. Tytgat, Willem Verbeke, B. Vermassen, Martina Vit, G. Bruno, C. Caputo, P. David, C. Delaere, M. Delcourt, A. Giammanco, Vincent Lemaître, Jessica Prisciandaro, A. Saggio, P. Vischia, J. Zobec, G. A. Alves, G. Correia Silva, C. Hensel, A. Moraes, E. Belchior Batista Das Chagas, W. Carvalho, J. Chinellato, E. Coelho, E. M. Da Costa, G. G. Da Silveira, D. De Jesus Damião, Carley De Oliveira Martins
Abstract
Production cross sections of , , and states decaying into in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at 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 is found to be . Similar results for the excited states indicate a sequential suppression pattern, such that . The suppression of all states is much less pronounced in pPb than in PbPb collisions, and independent of transverse momentum and center-of-mass rapidity of the individual state in the studied range and . 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.