First Observation of Radiative B^0 -> \\phi K^0 \\gamma Decays and Measurements of Their Time-Dependent CP Violation
Journal
Physical Review
Journal Volume
D84
Pages
071101
Date Issued
2011-04
Author(s)
Browder, T.E.
Adachi, I.
Asner, D.M.
Aulchenko, V.
Bakich, A.M.
Barberio, E.
Belous, K.
Bhardwaj, V.
Bhuyan, B.
Bondar, A.
Bozek, A.
Bra?ko, M.
Brovchenko, O.
Chen, A.
Chen, P.
Cheon, B.G.
Cho, K.
Choi, Y.
Dalseno, J.
Doleal, Z.
Dr?sal, Z.
Eidelman, S.
Epifanov, D.
Fast, J.E.
Gaur, V.
Gabyshev, N.
Haba, J.
Hayasaka, K.
Hayashii, H.
Horii, Y.
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.
Kiesling, C.
Kim, H.J.
Kim, H.O.
Kim, J.B.
Kim, J.H.
Kim, K.T.
Kim, M.J.
Kim, S.K.
Kim, Y.J.
Kinoshita, K.
Ko, B.R.
Kobayashi, N.
Koblitz, S.
Kody, P.
Korpar, S.
Krian, P.
Kuhr, T.
Kumar, R.
Kumita, T.
Kuzmin, A.
Kwon, Y.-J.
Lange, J.S.
Lee, M.J.
Lee, S.-H.
Li, J.
Li, Y.
Libby, J.
Lim, C.-L.
Liu, Z.Q.
Liventsev, D.
Louvot, R.
Matvienko, D.
McOnie, S.
Miyabayashi, K.
Miyata, H.
Miyazaki, Y.
Mizuk, R.
Mohanty, G.B.
Mori, T.
Nakao, M.
Natkaniec, Z.
Ng, C.
Nishida, S.
Nishimura, K.
Nitoh, O.
Nozaki, T.
Ohshima, T.
Okuno, S.
Olsen, S.L.
Onuki, Y.
Pakhlov, P.
Pakhlova, G.
Park, C.W.
Park, H.K.
Peng, T.
Pestotnik, R.
Petri?, M.
Piilonen, L.E.
Prim, M.
R?hrken, M.
Ryu, S.
Sakai, K.
Sakai, Y.
Sanuki, T.
Schneider, O.
Schwanda, C.
Schwartz, A.J.
Senyo, K.
Seon, O.
Sevior, M.E.
Shapkin, M.
Shebalin, V.
Shibata, T.-A.
Shiu, J.-G.
Shwartz, B.
Simon, F.
Smerkol, P.
Sohn, Y.-S.
Sokolov, A.
Solovieva, E.
Stani?, S.
Stari?, M.
Sumihama, M.
Sumisawa, K.
Sumiyoshi, T.
Suzuki, S.
Tatishvili, G.
Teramoto, Y.
Trabelsi, K.
Uchida, M.
Uglov, T.
Unno, Y.
Uno, S.
Ushiroda, Y.
Vahsen, S.E.
Varner, G.
Vinokurova, A.
Watanabe, M.
Watanabe, Y.
Williams, K.M.
Won, E.
Yabsley, B.D.
Yamashita, Y.
Yuan, C.Z.
Yusa, Y.
Zhang, C.C.
Zhang, Z.P.
Zhilich, V.
Zhou, P.
Zhulanov, V.
Abstract
We report the first observation of the radiative decay B0→· K0γ using a data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal of 37±8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B0→·K0γ)= (2.74±0.60±0.32)×10-6, where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters: S ·KS0γ=+0.74-1.05+0.72(stat)-0.24+0.10(syst) and A ·KS0γ=+0.35±0.58(stat)-0.10+0.23(syst). Furthermore, we measure B(B+→·K+γ)=(2. 48±0.30±0.24)×10-6, ACP=-0. 03±0.11±0.08, and find that the signal is concentrated in the M·K mass region near threshold. © 2011 American Physical Society.
Type
journal article