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Tumasyan, A; Fabjan, C; Jeitler, M; Knünz, V; Van Mulders, P; Wang, J; Martins, T; Matos Figueiredo, D; Marinho, F; Tcholakov, V; Hadjiiska, R; Litov, L; Pavlov, B; Chen, H S; Wendland, L; Dejardin, M; Hamel de Monchenault, G; Titov, M; Veelken, C; Hebbeker, T; Krämer, M; Krücker, D; Haller, J; Schröder, M; Nürnberg, A; Rabbertz, K; Troendle, D; Malhotra, S; Mazumdar, K; Arfaei, H; Khakzad, M; Creanza, D; Navarria, F L; Chiorboli, M; Piccolo, D; Menasce, D; Azzi, P; Gasparini, F; Dell'orso, R; Spagnolo, P; Soffi, L; Costa, M; Mariotti, C; Schizzi, A; Toropin, A; Epshteyn, V; Shreyber, I; Klyukhin, V; Battilana, C; Folgueras, S; Chuang, S H; Breuker, H; Christiansen, T; Coarasa Perez, J A; Lenzi, P; Worm, S D; Eller, P; Bakirci, M N; Karapinar, G; Ozdemir, K; Kaya, O; Cockerill, D J A; Jarvis, M; Kenzie, M; Symonds, P; Turner, M; Henderson, C; Demiragli, Z; Landsberg, G; Chauhan, S; Conway, J; Flowers, K; Apresyan, A; Calamba, A; Gibbons, L K; Hopkins, W; Butler, J N; Elvira, V D; Musienko, Y; Kypreos, T; Betts, R R; Lacroix, F; Nachtman, J; Yi, K; Wood, J S; Kolberg, T; Luckey, P D; Paus, C; Wenger, E A; Pearson, T; Winer, B L; Hegeman, J; Lopes Pegna, D; Raval, A; Gershtein, Y; Hollingsworth, M; Yang, Z C; Eusebi, R; Montalvo, R; Akchurin, N
Physical review letters, 02/2013, Letnik: 110, Številka: 8Journal Article
A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. An integrated luminosity of 17.3 fb(-1), collected by the CMS experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, is used. The measured mass in the ZZ channel, where both Z bosons decay to e or μ pairs, is 126.2 ± 0.6(stat) ± 0.2(syst) GeV. The angular distributions of the lepton pairs in this channel are sensitive to the spin-parity of the boson. Under the assumption of spin 0, the present data are consistent with the pure scalar hypothesis, while disfavoring the pure pseudoscalar hypothesis.
