Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-

Horii, Y.; Trabelsi, K.; Yamamoto, H.; Adachi, I.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Balagura, V.; Barberio, E.; Belous, K.; Bhuyan, B.; Bischofberger, M.; Bozek, A.; Bracko, M.; Browder, T. E.; Chang, M.-C.; Chang, P.; Chen, A.; Chen, P.; Cheon, B. G.; Chiang, C.-C.; Cho, I.-S.; Cho, K.; Choi, Y.; Dolezal, Z.; Eidelman, S.; Feindt, M.; Gaur, V.; Gabyshev, N.; Garmash, A.; Golob, B.; Ha, H.; Haba, J.; Hayasaka, K.; Hoshi, Y.; Hou, W.-S.; Hsiung, Y. B.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwabuchi, M.; Iwasaki, Y.; Iwashita, T.; Joshi, N. J.; Julius, T.; Kang, J. H.; Kawasaki, T.; Kichimi, H.; Kiesling, C.; Kim, H. J.; Kim, H. O.; Kim, M. J.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Kobayashi, N.; Korpar, S.; Krizan, P.; Kuhr, T.; Kumar, R.; Kwon, Y.-J.; Lee, M. J.; Lee, S.-H.; Li, J.; Liu, C.; Liventsev, D.; Louvot, R.; Matyja, A.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mohanty, G. B.; Moll, A.; Mori, T.; Muramatsu, N.; Nakano, E.; Nakazawa, H.; Natkaniec, Z.; Neubauer, S.; Nishida, S.; Nitoh, O.; Ohshima, T.; Okuno, S.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H. K.; Pestotnik, R.; Petric, M.; Piilonen, L. E.; Poluektov, A.; Prim, M.; Prothmann, K.; Roehrken, M.; Ryu, S.; et al.

doi:10.1103/PhysRevLett.106.231803

research article

Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-

Horii, Y.

•

Trabelsi, K.

•

Yamamoto, H.

2011

Physical Review Letters

The suppressed decay chain B- -> DK-, D -> K+pi(-), where D indicates a (D) over bar (0) or D-0 state, provides important information on the CP-violating angle phi(3). We measure the ratio R-DK of the decay rates to the favored mode B- -> DK-, D -> K+pi(-) to be R-DK = [1.63(-0.41)(+0.44)(stat)(-0.13)(+0.07)(syst)] x 10(-2), which indicates the first evidence of the signal with a significance of 4.1 sigma. We also measure the asymmetry A(DK) between the charge-conjugate decays to be A(DK) = -0.39(-0.28)(+0.26)(stat)(-0.03)(+0.04)(syst). The results are based on the full 772 x 10(6) B (B) over bar pair data sample collected at the Gamma(4S) resonance with the Belle detector.