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  • Study of W boson production...
    Albrecht, J.; d’Argent, P.; Aslanides, E.; Badalov, A.; Beaucourt, L.; Bedeschi, F.; Ben-Haim, E.; Blouw, J.; Bondar, N.; Bonivento, W.; Bozzi, C.; Carboni, G.; Carniti, P.; Cook, A.; Coombes, M.; Cowan, G. A.; Crocombe, A.; Currie, R.; David, P. N. Y.; De Bruyn, K.; De Miranda, J. M.; De Paula, L.; De Simone, P.; Dean, C.-T.; Derkach, D.; Evans, H. M.; Farry, S.; Fiorini, M.; Firlej, M.; Fontana, M.; Garrido, L.; Gershon, T.; Göbel, C.; Golubkov, D.; Gomes, A.; Gui, B.; Hoballah, M.; Hulsbergen, W.; Idzik, M.; Jawahery, A.; Jing, F.; Klimaszewski, K.; Kruse, F.; Lambert, D.; Lazzeroni, C.; Lees, J.-P.; Lefèvre, R.; Leverington, B.; Lionetto, F.; Liu, X.; Maciuc, F.; Maev, O.; Malinin, A.; Märki, R.; Martin, M.; Maurin, B.; Monteil, S.; Morawski, P.; Moron, J.; Nandi, A.; Nguyen-Mau, C.; Ninci, D.; Palutan, M.; Pepe Altarelli, M.; Petridis, K.; Pilař, T.; Polci, F.; Price, J. D.; Prisciandaro, J.; Pugatch, V.; Rives Molina, V.; Robbe, P.; Ruf, T.; Sanchez Mayordomo, C.; Satriano, C.; Saunders, D. M.; Schlupp, M.; Schneider, O.; Schune, M.-H.; Shevchenko, V.; Sirendi, M.; Skillicorn, I.; Smith, J.; Swientek, S.; Szczypka, P.; Tomassetti, L.; Ukleja, A.; Vazquez Gomez, R.; Veltri, M.; Veneziano, G.; Viaud, B.; Vollhardt, A.; Vorobyev, V.; Voß, C.; Waldi, R.; Weiden, A.; Zavertyaev, M.; Zhang, L.; Zhang, Y.; Zhong, L.

    Physical review. D, Particles, fields, gravitation, and cosmology, 09/2015, Letnik: 92, Številka: 5
    Journal Article

    The associated production of a W boson with a jet originating from either a light parton or heavy-flavor quark is studied in the forward region using proton-proton collisions. The analysis uses data corresponding to integrated luminosities of 1.0 and 2.0fb−1 collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, respectively. The W bosons are reconstructed using the W→μν decay and muons with a transverse momentum, pT, larger than 20 GeV in the pseudorapidity range 2.0<η<4.5. The partons are reconstructed as jets with pT>20 GeV and 2.2<η<4.2. The sum of the muon and jet momenta must satisfy pT>20 GeV. The fraction of W+jet events that originate from beauty and charm quarks is measured, along with the charge asymmetries of the W+b and W+c production cross-sections. The ratio of the W+jet to Z+jet production cross-sections is also measured using the Z→μμ decay. All results are in agreement with Standard Model predictions.