Measurement of J / ψ and ψ ( 2 S ) Prompt Double-Differential Cross Sections in p p Collisions at s = 7 TeV

• Published in: Physical review letters 2015-05, Vol.114 (19), Article 191802
• Main Authors: Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., Kiesenhofer, W., Knünz, V., Krammer, M., Krätschmer, I., Liko, D., Mikulec, I., Rabady, D., Rahbaran, B., Rohringer, H., Schöfbeck, R., Strauss, J., Treberer-Treberspurg, W., Waltenberger, W., Wulz, C.-E., Mossolov, V., Shumeiko, N., Suarez Gonzalez, J., Alderweireldt, S., Bansal, S., Cornelis, T., De Wolf, E. A., Janssen, X., Knutsson, A., Lauwers, J., Luyckx, S., Ochesanu, S., Rougny, R., Van De Klundert, M., Van Haevermaet, H., Van Mechelen, P., Van Remortel, N., Van Spilbeeck, A., Blekman, F., Blyweert, S., D’Hondt, J., Daci, N., Heracleous, N., Keaveney, J., Lowette, S., Maes, M., Olbrechts, A., Python, Q., Strom, D., Tavernier, S., Van Doninck, W., Van Mulders, P., Van Onsem, G. P., Villella, I., Caillol, C., Clerbaux, B., De Lentdecker, G., Dobur, D., Favart, L., Gay, A. P. R., Grebenyuk, A., Léonard, A., Mohammadi, A., Perniè, L., Randle-conde, A., Reis, T., Seva, T., Thomas, L., Vander Velde, C., Vanlaer, P., Wang, J., Zenoni, F., Adler, V., Beernaert, K., Benucci, L., Cimmino, A., Costantini, S., Crucy, S., Fagot, A., Garcia, G., Mccartin, J., Ocampo Rios, A. A., Poyraz, D., Ryckbosch, D., Salva Diblen, S., Sigamani, M., Strobbe, N., Thyssen, F., Tytgat, M., Yazgan, E., Zaganidis, N., Basegmez, S.
• Format: Article
• Language: English
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.114.191802

The double-differential cross sections of promptly produced J/ψ and ψ(2S) mesons are measured in pp collisions at √s = 7 TeV, as a function of transverse momentum pT and absolute rapidity |y|. The analysis uses J/ψ and ψ(2S) dimuon samples collected by the CMS experiment, corresponding to integrated luminosities of 4.55 and 4.90 fb–1, respectively. The results are based on a two-dimensional analysis of the dimuon invariant mass and decay length, and extend to pT = 120 and 100 GeV for the J/ψ and ψ(2S), respectively, when integrated over the interval |y| < 1.2. The ratio of the ψ(2S) to J/ψ cross sections is also reported for |y| < 1.2, over the range 10 < pT < 100 GeV. These are the highest pT values for which the cross sections and ratio have been measured.