Measurement of the decay Bs0→Ds-π+ and evidence for Bs0→Ds K± in e+e- annihilation at s 10.87GeV

Louvot, R.; Wicht, J.; Schneider, O.; Adachi, I.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Bakich, A.M.; Balagura, V.; Bay, A.; Bhardwaj, V.; Bitenc, U.; Bondar, A.; Bozek, A.; Bračko, M.; Browder, T.E.; Chen, A.; Cheon, B.G.; Chistov, R.; Cho, I.-S.; Choi, Y.; Dalseno, J.; Danilov, M.; Dash, M.; Drutskoy, A.; Dungel, W.; Eidelman, S.; Gabyshev, N.; Goldenzweig, P.; Golob, B.; Ha, H.; Haba, J.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Hoshi, Y.; Hou, W.-S.; Hyun, H.J.; Iijima, T.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwasaki, M.; Joshi, N.J.; Kah, D.H.; Kang, J.H.; Katayama, N.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, S.K.; Kim, Y.I.; Kim, Y.J.; Kinoshita, K.; Korpar, S.; Krian, P.; Krokovny, P.; Kumar, R.; Kuzmin, A.; Kwon, Y.-J.; Kyeong, S.-H.; Lange, J.S.; Lee, J.S.; Lee, M.J.; Lee, S.E.; Lesiak, T.; Li, J.; Limosani, A.; Lin, S.-W.; Liventsev, D.; Mandl, F.; Matyja, A.; McOnie, S.; Medvedeva, T.; Miyabayashi, K.; Miyake, H.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Mori, T.; Nakano, E.; Nakao, M.; Nishida, S.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okuno, S.; Ozaki, H.; Pakhlova, G.; Park, C.W.; Park, H.K.; Pestotnik, R.; Piilonen, L.E.; Sahoo, H.; Sakai, Y.; Schümann, J.; Schwartz, A.J.; Sekiya, A.

doi:10.1103/PhysRevLett.102.021801

research article

Measurement of the decay Bs0→Ds-π+ and evidence for Bs0→Ds K± in e+e- annihilation at s 10.87GeV

Louvot, R.

•

Wicht, J.

•

Schneider, O.

2009

Physical Review Letters

We have studied Bs0→Ds-π+ and Bs0→Ds K± decays using 23.6fb-1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e+e- collider. This highly pure Bs0→Ds-π+ sample is used to measure the branching fraction, B(Bs0→Ds-π+)=[3.67-0.33+0.35(stat)-0. 42+0.43(syst)±0.49(fs)]×10-3 (fs=NBs()B̄s()/ Nbb̄) and the fractions of Bs0 event types at the Υ(5S) energy, in particular NBsB̄s/NBs()B̄s()=(90.1-4.0+3. 8±0.2)%. We also determine the masses M(Bs0)=(5364.4±1.3±0. 7)MeV/c2 and M(Bs*)=(5416.4±0.4±0.5)MeV/c2. In addition, we observe Bs0→Ds K± decays with a significance of 3.5σ and measure B(Bs0→Ds K±)=[2.4-1.0+1.2(stat)±0.3(syst)±0. 3(fs)]×10-4. © 2009 The American Physical Society.