Journal Article

Study of ϒ production in pPb collisions at sNN=8.16 TeV

Wicht, J., Vorobyev, V., Chefdeville, M., Di Canto, A., Alexander, M., Jones, C. R., Durante, P., Gao, Y., Brossa Gonzalo, A., Yang, Z., Cardinale, R., Meinert, N., Mead, J. V., Barlow, R. J., Schmelling, M., Vázquez Sierra, C., Tourinho Jadallah Aoude, R., Cai, H., Bedeschi, F., Swientek, K., Stefko, P., Millard, E., Pugatch, V., Ketel, T., Ekelhof, R., Bobulska, D., Ferro-Luzzi, M., Lefèvre, R., Golubkov, D., Dalseno, J., Jawahery, A., Lai, A., Schneider, O., Rama, M., Bozzi, C., Carniti, P., Tran, M. T., Fontana, M., Straticiuc, M., Cenci, R., Ene, A., Smith, E., Gibson, V., Mulder, M., Ramos Pernas, M., Jiang, F., Bezshyiko, Ia, Beliy, N., Tuning, N., Kvaratskheliya, T., Morris, A. B., Williams, T., Carboni, G., Didenko, S., McNulty, R., Baldini, W., Ponce, S., Jalocha, J., Karacson, M., Nguyen-Mau, C., Pomery, G. J., Decamp, D., Hancock, T. H., Skidmore, N., Romanovskiy, V., Kolpin, M., Malecki, B., Cadeddu, S., Pappagallo, M., Kecke, M., Nanut, T., Marino, P., Materok, M., Merli, A., Shcheglov, Y., Dey, B., Yu, J., Byczynski, W., Zarebski, K. A., Hatch, M., Mogini, A., Coelho, J. A. B., Yin, H., Quagliani, R., Pikies, M., Nguyen, T. D., Parkes, C., F

2018

Overview

A bstract The production of ϒ ( nS ) mesons ( n = 1, 2, 3) in p Pb and Pb p collisions at a centre-of-mass energy per nucleon pair s N N = 8.16 TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb −1 . The ϒ ( nS ) mesons are reconstructed through their decays into two opposite-sign muons. The measurements comprise the differential production cross-sections of the ϒ (1 S ) and ϒ (2 S ) states, their forward-to-backward ratios and nuclear modification factors. The measurements are performed as a function of the transverse momentum p T and rapidity in the nucleon-nucleon centre-of-mass frame y * of the ϒ ( nS ) states, in the kinematic range p T < 25 GeV/ c and 1.5 < y * < 4.0 (−5.0 < y * < −2.5) for p Pb (Pb p ) collisions. In addition, production cross-sections for ϒ (3 S ) are measured integrated over phase space and the production ratios between all three ϒ ( nS ) states are determined. Suppression for bottomonium in proton-lead collisions is observed, which is particularly visible in the ratios. The results are compared to theoretical models.

• Publisher: Springer Berlin Heidelberg
• Subject: Classical and Quantum Gravitation / Elementary Particles / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Regular Article - Experimental Physics / Relativity Theory / String Theory