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  • Observation of Z production...
    Adinolfi, M.; Ajaltouni, Z.; Albrecht, J.; Anderlini, L.; Andreotti, M.; Aslanides, E.; Badalov, A.; Barlow, R. J.; Ben-Haim, E.; Blouw, J.; Borghi, S.; Borgia, A.; Brodzicka, J.; Cadeddu, S.; Calvo Gomez, M.; Campana, P.; Casse, G.; Cattaneo, M.; Coco, V.; Cook, A.; Counts, I.; Couturier, B.; Craik, D. C.; De Simone, P.; Deschamps, O.; Dossett, D.; Dujany, G.; Dupertuis, F.; Ekelhof, R.; Elsasser, Ch; Evans, T.; Falabella, A.; Fay, RF; Filippov, S.; Fiore, M.; Firlej, M.; Francisco, O.; Gavardi, L.; Gershon, T.; Ghez, Ph; Gibson, V.; Han, X.; Harnew, S. T.; Harrison, J.; Hicheur, A.; Hulsbergen, W.; Kanso, W.; Komarov, I.; Lai, A.; Lambert, R. W.; Lanciotti, E.; Lanfranchi, G.; Lazzeroni, C.; Le Gac, R.; Li, Y.; Lupton, O.; Machikhiliyan, I. V.; Maciuc, F.; Malde, S.; Martellotti, G.; Martens, A.; Meadows, B.; Muheim, F.; Naik, P.; Needham, M.; Niet, R.; Oblakowska-Mucha, A.; Okhrimenko, O.; Papanestis, A.; Passaleva, G.; Pepe Altarelli, M.; Poluektov, A.; Popov, D.; Rademacker, J. H.; Rakotomiaramanana, B.; Rauschmayr, N.; Reichert, S.; Rives Molina, V.; Robbe, P.; Rouvinet, J.; Sail, P.; Schmelling, M.; Schune, M.-H.; Smith, M.; Spradlin, P.; Storaci, B.; Swientek, S.; T’Jampens, S.; Tobin, M.; Tran, M. T.; Tsaregorodtsev, A.; Uwer, U.; Voß, C.; Websdale, D.; Wicht, J.; Xie, Y.; Yushchenko, O.; Zangoli, M.; Zhang, L.; Zhang, Y.

    The journal of high energy physics, 09/2014, Letnik: 2014, Številka: 9
    Journal Article

    A bstract The first observation of Z boson production in proton-lead collisions at a centre-of-mass energy per proton-nucleon pair of s N N = 5 TeV is presented. The data sample corresponds to an integrated luminosity of 1 . 6 nb −1 collected with the LHCb detector. The Z candidates are reconstructed from pairs of oppositely charged muons with pseudorapidities between 2.0 and 4.5 and transverse momenta above 20 GeV / c. The invariant dimuon mass is restricted to the range 60 − 120 GeV / c. The Z production cross-section is measured to be σ Z → μ + μ − fwd = 13.5 − 4.0 + 5.4 stat . ± 1.2 syst . nb in the direction of the proton beam and σ Z → μ + μ − bwd = 10.7 − 5.1 + 8.4 stat . ± 1.0 syst . nb in the direction of the lead beam, where the first uncertainty is statistical and the second systematic.