Observation of CP violation in B±→DK± decays

• Published in: Physics letters. B 2012-06, Vol.712 (3), p.203-212
• Main Authors: Affolder, A., Amhis, Y., Artamonov, A., Balagura, V., Barlow, R.J., Barschel, C., Barter, W., Belyaev, I., Benson, S., van Beuzekom, M., Bifani, S., Blake, T., Blanc, F., Blanks, C., Blouw, J., Blusk, S., Borghi, S., Borgia, A., Bowcock, T.J.V., Britton, T., Büchler-Germann, A., Bursche, A., Calvi, M., Campana, P., Carboni, G., Cardinale, R., Cauet, Ch, Ciba, K., Cid Vidal, X., Diniz Batista, P., van Eijk, D., Falabella, A., Färber, C., Fardell, G., Fave, V., Filippov, S., Fitzpatrick, C., Furcas, S., Gandini, P., Gao, Y., Garra Tico, J., Gaspar, C., Graciani Diaz, R., Gui, B., Haen, C., Hicks, E., Imong, J., Jansen, F., Jost, B., Kandybei, S., Keaveney, J., Kozlinskiy, A., Lacarrere, D., Li, L., Liles, M., Liu, B., Lopes, J.H., Mac Raighne, A., Machikhiliyan, I.V., Marconi, U., Märki, R., Martens, A., Martinelli, M., Massafferri, A., Maynard, B., McNulty, R., Mylroie-Smith, J., Nicol, M., Okhrimenko, O., Perego, D.L., Phan, A., Plo Casasus, M., Rangel, M.S., Roa Romero, D.A., Rosello, M., Rouvinet, J., Saborido Silva, J.J., Saitta, B., Santacesaria, R., Satriano, C., Satta, A., Schaack, P., Schmelling, M., Sciubba, A., Shapoval, I., Smith, N.A., Smith, E., Spradlin, P., Stagni, F., Tsaregorodtsev, A., Uwer, U., Vagnoni, V., Voong, D., Whitehead, M., Williams, M., Wyllie, K., Xing, F., Zhang, L., Zhang, Y., Zhong, L.
• Format: Article
• Language: English
• Subjects: CP violation; Exact sciences and technology; Hadronic B decays; High Energy Physics - Experiment; LHC; Nuclear physics; Physics; The physics of elementary particles and fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2012.04.060

An analysis of B±→DK± and B±→Dπ± decays is presented where the D meson is reconstructed in the two-body final states: K±π∓, K+K− and π+π−. Using 1.0 fb−1 of s=7TeVpp collisions, measurements of several observables are made including the first observation of the suppressed mode B±→[π±K∓]DK±. CP violation in B±→DK± decays is observed with 5.8σ significance.