Journal Article

Measurement of J/ψ production cross-sections in pp collisions at s = 5 TeV

Olivares, M. E., Vorobyev, V., Chefdeville, M., Alexander, M., Jones, C. R., Durante, P., Malczewski, J. J., Gao, Y., Eschle, J., Brossa Gonzalo, A., Yang, Z., Petric, M., Cardinale, R., Meinert, N., Mead, J. V., Barlow, R. J., Schmelling, M., Vázquez Sierra, C., Zhou, T., Cai, H., Bedeschi, F., Swientek, K., Yang, Y., Millard, E., Pugatch, V., Ketel, T., Bobulska, D., Ferro-Luzzi, M., Lefèvre, R., Zhang, S., Solovev, A., Golubkov, D., Passalacqua, B., Terentev, A., Lampis, A., Dalseno, J., Jawahery, A., Lai, A., Schneider, O., Rama, M., Bozzi, C., Carniti, P., Tran, M. T., Fontana, M., Straticiuc, M., Ene, A., Tanner, A. R., Smith, E., Zhou, X., Gibson, V., Mulder, M., Ramos Pernas, M., Jiang, F., Hollitt, S. E., Bezshyiko, Ia, Ribatti, R., Bertella, C., Tuning, N., Zharkova, A., Cobbledick, J. L., Kvaratskheliya, T., Morris, A. B., Carboni, G., Downes, A. G., Zenaiev, O., Puill, V., Didenko, S., Calero Diaz, L., McNulty, R., Baldini, W., Ponce, S., Karacson, M., Nguyen-Mau, C., Marshall, A. M., Bian, L., Decamp, D., Hancock, T. H., Brea Rodriguez, A., Skidmore, N., Chulikov, V., Romanovskiy, V., Malecki, B., Cadeddu, S., Pappagallo, M., Nanut, T., Ma

2021

Overview

A bstract The production cross-sections of J/ψ mesons in proton-proton collisions at a centre-of-mass energy of s = 5 TeV are measured using a data sample corresponding to an integrated luminosity of 9 . 13 ± 0 . 18 pb − 1 , collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, p T , and rapidity, y , and separately for J/ψ mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised J/ψ mesons, the production cross-sections integrated over the kinematic range 0 < p T < 20 GeV/ c and 2 . 0 < y < 4 . 5 are σ prompt J / ψ = 8.154 ± 0.010 ± 0.283 μb , σ nonprompt J / ψ = 0.820 ± 0.003 ± 0.034 μb , where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at s = 8 TeV and 13 TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for J/ψ mesons at a centre-of-mass energy per nucleon pair of s NN = 5 TeV. The results are compared with theoretical predictions.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Candidates / Classical and Quantum Gravitation / Collaboration / Cross-sections / Elementary Particles / Experiments / High energy physics / Large Hadron Collider / Luminosity / Mesons / Particle collisions / Physics / Physics and Astronomy / Protons / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Quarks / Regular Article - Experimental Physics / Relativity Theory / Sensors / Software / String Theory / Transverse momentum