Central exclusive production of \(J/\psi\) and \(\psi(2S)\) mesons in \(pp\) collisions at \(\sqrt{s}=13~\)TeV

• Published in: arXiv.org
• Main Authors: collaboration, LHCb, Alves, A A, Andreotti, M, Arzymatov, K, Barsuk, S, Beddow, J, Bel, L J, Belloli, N, Belyaev, I, Berninghoff, D, Bozzi, C, Calladine, R, Capriotti, L, Chatzikonstantinidis, G, Chen, C, X Cid Vidal, Couturier, B, M Cruz Torres, De Capua, S, Dujany, G, Durante, P, Durham, J M, Dziurda, A, Dzyuba, A, Evans, T, Fiorini, M, J Fu, Gabriel, E, Gerick, D, Giubega, L, Gligorov, V V, Golutvin, A, Graziani, G, Göbel, C, Hancock, T H, Harnew, S T, J He, Hill, D, Ivshin, K, Khurewathanakul, C, Langenbruch, C, Likhomanenko, T, Lopes, J H, M Lucio Martinez, Maltsev, T, Manca, G, Marchand, J F, Matev, R, Meaux, C, Millard, E, Minzoni, L, Morello, G, Mulder, M, Nanut, T, Nasteva, I, Neuner, M, Nikitin, N, Ossowska, A, Pastore, A, Patrignani, C, Pearce, A, Perret, P, Petrov, A, Polukhina, N, Poslavskii, S, Qian, W, M Ramos Pernas, Richards, S, Saitta, B, Guimaraes, V Salustino, Santimaria, M, Sarpis, G, Sarti, A, Schwemmer, R, Sciascia, B, Semennikov, A, Sepulveda, E S, Serrano, J, Sestini, L, Shears, T, R Silva Coutinho, Silva de Oliveira, L, Stefko, P, Stone, S, Stracka, S, Stramaglia, M E, Szumlak, T, T'Jampens, S, Tayduganov, A, Tonelli, D, Traill, M, Ukleja, A, Valat, S, Venkateswaran, A, Viemann, H, Vilasis-Cardona, X, Wang, M, Wang, Y, Wilkinson, M, Williams, T
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 30.10.2018
• Subjects: Collisions; Cross-sections; Luminosity; Mesons; Muons; Photoproduction
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1806.04079

Measurements are reported of the central exclusive production of \jpsi and \psitwos 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 \(2.0<\eta<4.5\), are measured to be $$ \begin{array}{rcl} \sigma_{J/\psi\rightarrow\mu^+\mu^-}&=&435 \pm 18 \pm 17 \pm 16 {\rm \ pb},\\ \sigma_{\psi(2S)\rightarrow\mu^+\mu^-}&=&11.1 \pm 1.1 \pm 0.3 \pm 0.4 {\rm \ pb}.\\ \end{array} $$ 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.