Journal Article

Central exclusive production of J/ψ and ψ(2S) mesons in pp collisions at s=13 TeV

Wicht, J., Vorobyev, V., Chefdeville, M., Di Canto, A., Alexander, M., Jones, C. R., Durante, P., Gao, Y., Yang, Z., Cardinale, R., Gianì, S., 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., Merli, A., Shcheglov, Y., Dey, B., Yu, J., Byczynski, W., Zarebski, K. A., Hatch, M., Mogini, A., Yin, H., Quagliani, R., Pikies, M., Nguyen, T. D., Parkes, C., Ferrari, F., Malinin, A., Oblakowska-Much

2018

Overview

A bstract Measurements are reported of the central exclusive production of J/ψ and ψ (2 S ) mesons in pp collisions at a centre-of-mass energy of 13 TeV. Backgrounds are significantly reduced compared to previous measurements made at lower energies through the use of new forward shower counters. The products of the cross-sections and the branching fractions for the decays to dimuons, where both muons are within the pseudorapidity range 2 . 0 < η < 4 . 5, are measured to be σ J / ψ → μ + μ − = 435 ± 18 ± 11 ± 17 p b σ ψ 2 S → μ + μ − = 11.1 ± 1.1 ± 0.3 ± 0.4 p b . The first uncertainties are statistical, the second are systematic, and the third are due to the luminosity determination. The cross-sections are also measured differentially for meson rapidities between 2.0 and 4.5. Good agreement is observed with theoretical predictions. Photoproduction cross-sections are derived and compared to previous experiments, and a deviation from a pure power-law extrapolation of lower energy data is observed.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Classical and Quantum Gravitation / Collisions / Cross-sections / Elementary Particles / High energy physics / Luminosity / Mesons / Muons / Photoproduction / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Regular Article - Experimental Physics / Relativity Theory / String Theory