Measurement of the Z[gamma] production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplings

• Published in: The journal of high energy physics 2015-04, Vol.2015 (4), p.1
• Main Authors: Friedl, M, Hörmann, N, Liko, D, Van Mulders, P, Vanlaer, P, Costantini, S, Thyssen, F, Basegmez, S, Jez, P, Gregores, E M, Aleksandrov, A, Vutova, M, Cabrera, A, Kortelainen, M J, Faure, J L, Hamel De Monchenault, G, Salerno, R, Vander Donckt, M, Bontenackels, M, Hoehle, F, Costanza, F, Krücker, D, Mittag, G, Ribeiro Cipriano, P M, Blobel, V, Garutti, E, Poehlsen, T, Mozer, M U, Müller, Th, Zsigmond, A J, Molnar, J, Bhattacharya, S, Maggi, G, Tuve, C, Gerosa, R, Pozzobon, N, Bernardini, J, Messineo, A, Squillacioti, P, Venturi, A, Paramatti, R, Migliore, E, Gyun, D, Ali, M A, B, Md, Szleper, M, Ferreira Parracho, P G, Palichik, V, Tlisov, D, Bitioukov, S, Kachanov, V, Escalante Del Valle, A, Duarte Campderros, J, Bachtis, M, Dabrowski, A, De Guio, F, Mohr, N, Hos, I, Yalvac, M, Sorokin, P, Jacob, J, Cockerill, D J, A, Petyt, D, Davies, G, Conway, R, Smith, J, Squires, M, Tripathi, M, Long, O R, Pieri, M, Tu, Y, Nauenberg, U, Eggert, N, Sun, W, Kreis, B, Sharma, S, Furic, I K, Rinkevicius, A, Hagopian, S, Benelli, G, Sanders, S, Hadley, N J, Skuja, A, Cali, I A, Klute, M, Roland, C, Klapoetke, K, Trocino, D, Odell, N, Schmitt, M, Lynch, S, Valls, N, Brownson, E, Hu, Z, Shipsey, I, Betchart, B, Ciesielski, R, Kaplan, S, Sheffield, D, Somalwar, S, Thomassen, P
• Format: Article
• Language: English
• Subjects: High energy physics
• ISSN: 1029-8479
• DOI: 10.1007/JHEP04(2015)164

Abstract The cross section for the production of Zγ in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb^sup -1^. Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. The differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. The observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. Limits on anomalous triple gauge couplings of ZZγ and Zγγ are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson. [Figure not available: see fulltext.]