Measurement of indirect CP asymmetries in D0 → K−K+ and D0 → π−π+ decays using semileptonic B decays

• Published in: The journal of high energy physics Vol. 2015; no. 4
• Main Authors: Adinolfi, M., Ajaltouni, Z., Albrecht, J., Anderlini, L., Andreotti, M., Aslanides, E., Badalov, A., Barlow, R. J., Bowen, E., Britsch, M., Buytaert, J., Calvi, M., Campora Perez, D., Carboni, G., Carson, L., Clemencic, M., Closier, J., Cogan, J., Cogoni, V., Collazuol, G., Counts, I., De Simone, P., Dettori, F., Dijkstra, H., Dziurda, A., Elsasser, Ch, Ferreira Rodrigues, F., Filippov, S., Firlej, M., Fitzpatrick, C., Fol, P., Fontana, M., Gallorini, S., Gao, Y., Garrido, L., Gazzoni, G., Geraci, A., Gomes, A., Harnew, S. T., Henrard, P., Hynds, D., Jing, F., Johnson, D., Jost, B., Jurik, N., Karbach, T. M., Khanji, B., Kreps, M., Krocker, G., Kudryavtsev, V., La Thi, V. N., Lees, J.-P., Liles, M., Lindner, R., Luo, H., Machefert, F., Mazurov, A., McCann, M., McNulty, R., Merk, M., Mountain, R., Muheim, F., Nguyen, A. D., Oldeman, R., Pappalardo, L. L., Pellegrino, A., Pinci, D., Playfer, S., Popov, D., Prisciandaro, J., Puig Navarro, A., Rauschmayr, N., Reid, M. M., Rihl, M., Rives Molina, V., Robbe, P., Rouvinet, J., Ruiz, H., Sarti, A., Schlupp, M., Schune, M.-H., Sciascia, B., Shapkin, M., Silva Coutinho, R., Smith, N. A., Stagni, F., Stahl, S., Steinkamp, O., Sutcliffe, W., Szczekowski, M., Szumlak, T., Tsaregorodtsev, A., Vollhardt, A., Walsh, J., Watson, N. K., Wilson, F. F., Wishahi, J., Yuan, X., Zhang, W. C., Zhong, L.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 09.04.2015
• Subjects: Classical and Quantum Gravitation; Elementary Particles; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Experimental Physics; Relativity Theory; String Theory; Hadron-Hadron Scattering; Lifetime; CP violation; Charm physics
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP04(2015)043

A bstract Time-dependent CP asymmetries in the decay rates of the singly Cabibbo-suppressed decays D 0 → K − K + and D 0 → π − π + are measured in pp collision data corresponding to an integrated luminosity of 3.0 fb −1 collected by the LHCb experiment. The D 0 mesons are produced in semileptonic b -hadron decays, where the charge of the accompanying muon is used to determine the initial state as D 0 or D ¯ 0 . The asymmetries in effective lifetimes between D 0 and D ¯ 0 decays, which are sensitive to indirect CP violation, are determined to be A Γ K − K + = − 0.134 ± 0.0 77 − 0.034 − 0.026 % , A Γ π − π + = − 0.092 ± 0 . 145 − 0.033 − 0.025 % , where the first uncertainties are statistical and the second systematic. This result is in agreement with previous measurements and with the hypothesis of no indirect CP violation in D 0 decays.