direct CP violation, and partial widths in D 0 meson decays to K + K - and + - Lifetime differences

We describe several measurements using the decays D 0 K + K - and + - . We find the ratio of partial widths, (D 0 K + K - )/ (D 0 + - ), to be 2.960.160.15, where the first error is statistical and the second is systematic. We observe no evidence for direct CP violation, obtaining A CP (KK)=(0.02.20.8)% and A CP ()=(1.93.20.8)%. In the limit of no CP violation we measure the mixing parameter y CP =-0.0120.0250.014 by measuring the lifetime difference between D 0 K + K - or + - and the CP neutral state, D 0 K - + . We see no evidence for mixing.

Csorna, S. E., Danko, I., McLean, K. W., Xu, Z., Godang, R., Bonvicini, G., ... Stepaniak, C. J.

Csorna, SE||Danko, I||McLean, KW||Xu, Z||Godang, R||Bonvicini, G||Cinabro, D||Dubrovin, M||McGee, S||Bornheim, A||Lipeles, E||Pappas, SP||Shapiro, A||Sun, WM||Weinstein, AJ||Jaffe, DE||Mahapatra, R||Masek, G||Paar, HP||Asner, DM||Hill, TS||Morrison, RJ||Nelson, HN||Briere, RA||Chen, GP||Ferguson, T||Vogel, H||Alexander, JP||Bebek, C||Berkelman, K||Blanc, F||Boisvert, V||Cassel, DG||Drell, PS||Duboscq, JE||Ecklund, KM||Ehrlich, R||Gibbons, L||Gittelman, B||Gray, SW||Hartill, DL||Heltsley, BK||Hsu, L||Jones, CD||Kandaswamy, J||Kreinick, DL||Lohner, M||Magerkurth, A||Mahlke-Krüger, H||Meyer, TO||Mistry, NB||Nordberg, E||Palmer, M||Patterson, JR||Peterson, D||Pivarski, J||Riley, D||Schwarthoff, H||Thayer, JG||Urner, D||Valant-Spaight, B||Viehhauser, G||Warburton, A||Weinberger, M||Athar, SB||Avery, P||Prescott, C||Stoeck, H||Yelton, J||Brandenburg, G||Ershov, A||Kim, DYJ||Wilson, R||Benslama, K||Eisenstein, BI||Ernst, J||Gladding, GE||Gollin, GD||Hans, RM||Karliner, I||Lowrey, N||Marsh, MA||Plager, C||Sedlack, C

Lifetime differences, direct CP violation, and partial widths in D ⁰ meson decays to K ⁺ K ^- and ⁺ ^- Academic Article