J/\psi$ and $\psi(2S)$ production at forward rapidity in $p$+$p$ collisions at $\sqrt{s}=510$ GeV

• Published in: Physical review. D 2020, Vol.101 (5)
• Main Authors: Acharya, U.A., Adare, A., Aidala, C., Ajitanand, N.N., Akiba, Y., Akimoto, R., Alfred, M., Apadula, N., Aramaki, Y., Asano, H., Atomssa, E.T., Awes, T.C., Azmoun, B., Babintsev, V., Bai, M., Bandara, N.S., Bannier, B., Barish, K.N., Bathe, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belmont, R., Berdnikov, A., Berdnikov, Y., Black, D., Bok, J.S., Boyle, K., Brooks, M.L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Canoa Roman, V., Chen, C.-H., Chi, C.Y., Chiu, M., Choi, I.J., Choi, J.B., Chujo, T., Citron, Z., Connors, M., Csanád, M., Csörgő, T., Danley, T.W., Datta, A., Daugherity, M.S., David, G., Deblasio, K., Dehmelt, K., Denisov, A., Deshpande, A., Desmond, E.J., Ding, L., Dion, A., Do, J.H., Drees, A., Drees, K.A., Durham, J.M., Durum, A., Enokizono, A., En'Yo, H., Esha, R., Esumi, S., Fadem, B., Fan, W., Feege, N., Fields, D.E., Finger, M., Fitzgerald, D., Fokin, S.L., Frantz, J.E., Franz, A., Frawley, A.D., Gal, C., Gallus, P., Gamez, E.A., Garg, P., Ge, H., Giordano, F., Glenn, A., Goto, Y., Grau, N., Greene, S.V., Grosse Perdekamp, M., Gu, Yuqiao, Gunji, T., Guragain, H., Hachiya, T., Haggerty, J.S., Hahn, K.I., Hamagaki, H., Han, S.Y., Hanks, J., Hasegawa, S., Haseler, T.O.S., He, X., Hemmick, T.K., Hill, J.C., Hill, K.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 2470-0010; 2470-0029
• DOI: 10.1103/PhysRevD.101.052006

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the differential cross section, mean transverse momentum, mean transverse momentum squared of inclusive J/ψ, and cross section ratio of ψ(2S) to J/ψ at forward rapidity in p+p collisions at s=510  GeV via the dimuon decay channel. Comparison is made to inclusive J/ψ cross sections measured at s=200  GeV and 2.76–13 TeV. The result is also compared to leading-order nonrelativistic QCD calculations coupled to a color-glass-condensate description of the low-x gluons in the proton at low transverse momentum (pT) and to next-to-leading order nonrelativistic QCD calculations for the rest of the pT range. These calculations overestimate the data at low pT. While consistent with the data within uncertainties above ≈3  GeV/c, the calculations are systematically below the data. The total cross section times the branching ratio is BR dσppJ/ψ/dy(1.2