Exclusive J ψ and ψ(2S) production in pp collisions at TeV

• Published in: Journal of physics. G, Nuclear and particle physics Vol. 40; no. 4
• Main Authors: Aaij, R, Archilli, F, Baesso, C, Baldini, W, Belyaev, I, Bettler, M-O, Bird, T, Blanc, F, Bowcock, T J V, Britsch, M, Burducea, I, Bursche, A, Carboni, G, Carranza-Mejia, H, Casse, G, Charpentier, P, Clarke, P E L, Clemencic, M, Collins, P, Cunliffe, S, Decamp, D, Deplano, C, Dogaru, M, Dordei, F, Dziurda, A, Rifai, I El, Elsasser, C, Elsby, D, Ferguson, D, Fitzpatrick, C, Frank, M, Gandini, P, Garosi, P, Graugés, E, Gushchin, E, Hall, S, Heijne, V, van Herwijnen, E, Hill, D, Hopchev, P, Hulsbergen, W, Hynds, D, Jacobsson, R, Jaeger, A, Jansen, F, Kruse, F, Kudryavtsev, V, Kvaratskheliya, T, Lacarrere, D, Lazzeroni, C, van Leerdam, J, Lefrançois, J, Liu, B, Asamar, E Lopez, Luisier, J, Machefert, F, Mangiafave, N, Sánchez, A Martín, Santos, D Martinez, Massafferri, A, Matteuzzi, C, Meissner, M, Monteil, S, Naik, P, Neufeld, N, Nguyen, A D, Nguyen-Mau, C, Nisar, S, Patel, M, Pellegrino, A, Penso, G, Pila, T, Prisciandaro, J, Rademacker, J H, Rinnert, K, Roiser, S, Schaack, P, Schiller, M, Schleich, S, Schune, M-H, Sciubba, A, Sepp, I, Shapkin, M, Soomro, F, Souza, D, Stahl, S, T'Jampens, S, Tobin, M, Tonelli, D, Valenti, G, Gomez, R Vazquez, Regueiro, P Vazquez, Veltri, M, Viaud, B, Vollhardt, A, Voß, C, Wiedner, D, Wotton, S A, Zhang, L, Zhelezov, A
• Format: Journal Article
• Language: English
• Published: IOP Publishing 27.02.2013
• Subjects: forward physics; particle and resonance production; QCD
• ISSN: 0954-3899; 1361-6471
• DOI: 10.1088/0954-3899/40/4/045001

Exclusive J ψ and ψ(2S) vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between 2.0 and 4.5 are measured to be where the first uncertainties are statistical and the second are systematic. The measurements are found to be in good agreement with results from previous experiments and theoretical predictions. The J ψ photoproduction cross-section has been measured as a function of the photon-proton centre-of-mass energy. The results are consistent with measurements obtained at HERA and confirm a similar power law behaviour for the photoproduction cross-section.