First measurement of time-dependent CP violation in Bs -> K+K- decays

• Published in: arXiv.org 2013-11
• Main Authors: collaboration, LHCb, Alves, A A, Archilli, F, Artamonov, A, Balagura, V, Bifani, S, Bocci, V, Bondar, A, Bozzi, C, Brook, N H, Casse, G, Cattaneo, M, Chen, P, Chrzaszcz, M, Ciba, K, Coca, C, Cogan, J, Collins, P, Cook, A, Craik, D C, Cunliffe, S, D'Ambrosio, C, De Capua, S, De Miranda, J M, Deschamps, O, Egorychev, V, Eitschberger, U, Farinelli, C, Farry, S, Ferguson, D, Fitzpatrick, C, Fontanelli, F, Frei, C, A Gallas Torreira, Gaspar, C, Gersabeck, E, Gorbounov, P, R Graciani Diaz, Graugés, E, Griffith, P, Gui, B, Harrison, J, J He, Hess, M, Hill, D, Huse, T, Kreplin, K, Krocker, G, Kvaratskheliya, T, Lanciotti, E, Lanfranchi, G, J -P Lees, Lesiak, T, Liu, B, Liu, G, Malde, S, Martynov, A, Matev, R, Mordà, A, Morello, M J, Nguyen, T D, Nguyen-Mau, C, Nikodem, T, Owen, P, Palutan, M, A Pazos Alvarez, Pérez-Calero Yzquierdo, A, Pietrzyk, B, Polok, G, Pritchard, A, Pugatch, V, Rauschmayr, N, Raven, G, Roa Romero, D A, Ruf, T, Saborido Silva, J J, Santacesaria, R, Santovetti, E, Savrina, D, Schindler, H, Schmidt, B, Sciascia, B, Shapkin, M, Shcheglov, Y, Spaan, B, Stoica, S, Straticiuc, M, Straumann, U, Syropoulos, V, Teklishyn, M, J van Tilburg, Tolk, S, Vallier, A, Velthuis, J J, Volyanskyy, D, Wandernoth, S, Wiedner, D, Wishahi, J, Xing, Z, Zhang, L
• Format: Article
• Language: English
• Subjects: CP violation; Decay; Luminosity; Time dependence
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1308.1428

Direct and mixing-induced CP-violating asymmetries in Bs -> K+K- decays are measured for the first time using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0 fb^{-1}, collected with the LHCb detector at a centre-of-mass energy of 7 TeV. The results are C_{KK} = 0.14 \pm 0.11 \pm 0.03 and S_{KK} = 0.30 \pm 0.12 \pm 0.04, where the first uncertainties are statistical and the second systematic. The corresponding quantities are also determined for B0 -> pi+pi- decays to be C_{pipi} = -0.38 \pm 0.15 \pm 0.02 and S_{pipi} = -0.71 \pm 0.13 \pm 0.02, in good agreement with existing measurements.