Evidence for direct CP violation in the measurement of the Cabbibo-Kobayashi-Maskawa angle γ with B∓ → D()K()∓ decays

• Published in: Physical review letters Vol. 105; no. 12; p. 121801
• Main Authors: del Amo Sanchez, P, Lees, J P, Poireau, V, Prencipe, E, Tisserand, V, Garra Tico, J, Grauges, E, Martinelli, M, Palano, A, Pappagallo, M, Eigen, G, Stugu, B, Sun, L, Battaglia, M, Brown, D N, Hooberman, B, Kerth, L T, Kolomensky, Yu G, Lynch, G, Osipenkov, I L, Tanabe, T, Hawkes, C M, Watson, A T, Koch, H, Schroeder, T, Asgeirsson, D J, Hearty, C, Mattison, T S, McKenna, J A, Khan, A, Randle-Conde, A, Blinov, V E, Buzykaev, A R, Druzhinin, V P, Golubev, V B, Onuchin, A P, Serednyakov, S I, Skovpen, Yu I, Solodov, E P, Todyshev, K Yu, Yushkov, A N, Bondioli, M, Curry, S, Kirkby, D, Lankford, A J, Mandelkern, M, Martin, E C, Stoker, D P, Atmacan, H, Gary, J W, Liu, F, Long, O, Vitug, G M, Campagnari, C, Hong, T M, Kovalskyi, D, Richman, J D, Eisner, A M, Heusch, C A, Kroseberg, J, Lockman, W S, Martinez, A J, Schalk, T, Schumm, B A, Seiden, A, Winstrom, L O, Cheng, C H, Doll, D A, Echenard, B, Hitlin, D G, Ongmongkolkul, P, Porter, F C, Rakitin, A Y, Andreassen, R, Dubrovin, M S, Mancinelli, G, Meadows, B T, Sokoloff, M D, Bloom, P C, Ford, W T, Gaz, A, Hirschauer, J F, Nagel, M, Nauenberg, U, Smith, J G, Wagner, S R, Ayad, R, Toki, W H, Karbach, T M, Merkel, J, Petzold, A, Spaan, B, Wacker, K, Kobel, M J, Schubert, K R, Schwierz, R, Bernard, D, Verderi, M, Clark, P J, Playfer, S
• Format: Journal Article
• Language: English
• Published: United States American Physical Society 17-09-2010
• Subjects: Experiments; Física de partícules; Particle physics
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.105.121801

We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle γ through a Dalitz plot analysis of neutral D-meson decays to K(S)(0) π+ π- and K(S)(0) K+ K- produced in the processes B∓ → DK∓, B∓ D* K∓ with D* → Dπ(0), Dγ, and B∓ → DK*∓ with K*∓ → K(S)(0) π∓, using 468 million BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy e+ e- collider at SLAC. We measure γ = (68 ± 14 ± 4 ± 3)° (modulo 180°), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with γ = 0 (no direct CP violation) with a significance of 3.5 standard deviations.