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  • Measurement of the W boson ...
    Sirunyan, A.M.; Hartl, C.; Jeitler, M.; Mossolov, V.; Beluffi, C.; Chinellato, J.; Aleksandrov, A.; Liu, Z.; Luukka, P.; Couderc, F.; Faure, J.L.; Baffioni, S.; Buttignol, M.; Chabert, E.C.; Fontaine, J.-C.; Courbon, B.; Lomidze, D.; Heister, A.; Schulte, J.F.; Sonnenschein, L.; Stahl, A.; Costanza, F.; Lobanov, A.; Roland, B.; Stefaniuk, N.; Troendle, D.; Vormwald, B.; Husemann, U.; Papadopoulos, I.; Garg, R.B.; Roy, D.; Jha, V.; Parida, B.; Silvestris, L.; Abbiendi, G.; Brigliadori, L.; Siroli, G.P.; Ragazzi, S.; Lacaprara, S.; Androsov, K.; Organtini, G.; Cho, S.; Yang, U.K.; Olszewski, M.; Seixas, J.; Vorobyev, A.; Zhokin, A.; Rusakov, S.V.; Flix, J.; Dabrowski, A.; De Guio, F.; Dordevic, M.; Gill, K.; Pandolfi, F.; Quittnat, M.; Pinna, D.; Khurana, R.; Gurpinar, E.; Bilmis, S.; Ball, F.; Brew, C.; Burton, D.; Elwood, A.; Futyan, D.; Seez, C.; Henderson, C.; Berry, E.; Jesus, O.; Pellett, D.; Ellison, J.; Cittolin, S.; Welke, C.; Heller, R.; Mccoll, N.; Paulini, M.; Alexander, J.; Rinkevicius, A.; Lincoln, D.; Stoynev, S.; Adams, J.R.; Prosper, H.; Bucinskaite, I.; Durgut, S.; Ozok, F.; Stringer, R.; Abercrombie, D.; Busza, W.; Paus, C.; Fangmeier, C.; Orimoto, T.; Mucia, N.; Bylsma, B.; Elmer, P.; Zuranski, A.; Jha, M.K.; Gershtein, Y.; Heideman, J.; Pakhotin, Y.; Undleeb, S.; Duric, S.

    Physics letters. B, 11/2016, Letnik: 762
    Journal Article

    The W boson helicity fractions from top quark decays in tt‾ events are measured using data from proton–proton collisions at a centre-of-mass energy of 8TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8fb−1. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F0=0.681±0.012(stat)±0.023(syst), FL=0.323±0.008(stat)±0.014(syst), and FR=−0.004±0.005(stat)±0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.