Measurement of Wγ and Zγ production in proton-proton collisions at $ \sqrt {s} = 7 $ TeV with the ATLAS detector

• Published in: The journal of high energy physics 2011-09, Vol.2011 (9)
• Main Authors: Alexa, C., Aoun, S., Becks, K. H., Benjamin, D. P., Bensinger, J. R., Boldea, V., Bressler, S., Capua, M., Caramarcu, C., Castaneda-Miranda, E., Cauz, D., Cavalli-Sforza, M., Chan, K., Chekulaev, S. V., Cheng, S., Chizhov, M. V., Consonni, M., Cooper-Smith, N. J., Cortiana, G., Da Rocha Gesualdi Mello, A., Dallapiccola, C., Dawson, J. W., Dehchar, M., Edwards, N. C., Ehrenfeld, W., Fabre, C., Farbin, A., Fischer, P., Foussat, A., García, C., Gee, C. N. P., Goy, C., Griesmayer, E., Gusakov, Y., Han, H., Hansson, P., Harrison, K., Havranek, M., Hazen, E., Hertenberger, R., Howarth, J., Huang, G. S., Iwanski, W., Johansen, L. G., Jorge, P. M., Kashif, L., Kass, R. D., Kazanin, V. A., Kollar, D., Kozhin, A. S., Kreisel, A., La Rotonda, L., Lankford, A. J., Lee, L., Leyton, M., Lilley, J. N., Liu, J. B., Lobodzinska, E., Lockwitz, S., Lund, E., Lutz, G., Ma, L. L., Manabe, A., Marchese, F., Martens, F. K., Martin, B., Mendoza Navas, L., Mikuž, M., Morvaj, L., Nicolaidou, R., O’Neil, D. C., Pauly, T., Pravahan, R., Resende, B., Richards, A., Roda Dos Santos, D., Royon, C. R., Sauvage, G., Savva, P., Sbrizzi, A., Schumacher, J. W., Shao, Q. T., Short, D., Strandberg, S., Soh, D. A., Sugaya, Y., Sykora, I., Taffard, A., Tovey, D. R., Tsiskaridze, V., Tskhadadze, E. G., Varnes, E. W., Vazeille, F., Vermeulen, J. C., Vinogradov, V. B., Volpi, G., Vranjes Milosavljevic, M., Warsinsky, M., Ženiš, T., Zhu, H.
• Format: Article
• Language: English
• ISSN: 1029-8479; 1029-8479

We present studies of W and Z bosons with associated high energy photons produced in pp collisions at √s=7 TeV. The analysis uses 35 pb⁻¹ of data collected by the ATLAS experiment in 2010. The event selection requires W and Z bosons decaying into high p T leptons (electrons or muons) and a photon with E T > 15 GeV separated from the lepton(s) by a distance ΔR(l, γ) > 0.7 in η-Φ space. A total of 95 (97) pp → e ± νγ + X(pp → μ± νγ + X) and 25 (23) pp → e⁺ e⁻ γ + X(pp → μ⁺μ⁻ γ + X) event candidates are selected. The kinematic distributions of the leptons and photons and the production cross sections are measured. The data are found to agree with Standard Model predictions that include next-to-leading-order O(αα s ) contributions.