Evidence for Isospin Violation and Measurement of CP Asymmetries in B→K^{*}(892)γ.
T Horiguchi, A Ishikawa, H Yamamoto, I Adachi, H Aihara, S Al Said, D M Asner, V Aulchenko, T Aushev, R Ayad, V Babu, I Badhrees, A M Bakich, V Bansal, P Behera, V Bhardwaj, B Bhuyan, J Biswal, A Bobrov, G Bonvicini, A Bozek, M Bračko, T E Browder, D Červenkov, V Chekelian, A Chen, B G Cheon, K Chilikin, K Cho, Y Choi, D Cinabro, T Czank, N Dash, S Di Carlo, Z Doležal, Z Drásal, D Dutta, S Eidelman, D Epifanov, H Farhat, J E Fast, T Ferber, B G Fulsom, V Gaur, N Gabyshev, A Garmash, M Gelb, R Gillard, P Goldenzweig, B Golob, Y Guan, E Guido, J Haba, T Hara, K Hayasaka, H Hayashii, M T Hedges, T Higuchi, S Hirose, W-S Hou, T Iijima, K Inami, G Inguglia, R Itoh, Y Iwasaki, W W Jacobs, I Jaegle, H B Jeon, S Jia, Y Jin, D Joffe, K K Joo, T Julius, K H Kang, T Kawasaki, D Y Kim, J B Kim, K T Kim, M J Kim, S H Kim, Y J Kim, K Kinoshita, P Kodyš, S Korpar, D Kotchetkov, P Križan, P Krokovny, T Kuhr, R Kulasiri, R Kumar, T Kumita, A Kuzmin, Y-J Kwon, J S Lange, C H Li, L Li, L Li Gioi, J Libby, D Liventsev, M Lubej, T Luo, M Masuda, T Matsuda, D Matvienko, M Merola, K Miyabayashi, H Miyata, R Mizuk, G B Mohanty, S Mohanty, H K Moon, T Mori, R Mussa, E Nakano, M Nakao, T Nanut, K J Nath, Z Natkaniec, M Nayak, N K Nisar, S Nishida, S Ogawa, S Okuno, H Ono, P Pakhlov, G Pakhlova, B Pal, S Pardi, C-S Park, H Park, S Paul, T K Pedlar, R Pestotnik, L E Piilonen, K Prasanth, C Pulvermacher, J Rauch, A Rostomyan, Y Sakai, S Sandilya, L Santelj, V Savinov, O Schneider, G Schnell, C Schwanda, A J Schwartz, Y Seino, K Senyo, I S Seong, M E Sevior, V Shebalin, C P Shen, T-A Shibata, J-G Shiu, F Simon, A Sokolov, E Solovieva, M Starič, J F Strube, K Sumisawa, T Sumiyoshi, M Takizawa, U Tamponi, K Tanida, F Tenchini, K Trabelsi, M Uchida, T Uglov, Y Unno, S Uno, P Urquijo, Y Ushiroda, Y Usov, C Van Hulse, G Varner, A Vinokurova, V Vorobyev, A Vossen, C H Wang, M-Z Wang, P Wang, Y Watanabe, S Watanuki, T Weber, E Widmann, E Won, Y Yamashita, H Ye, Z P Zhang, V Zhilich, V Zhukova, V Zhulanov, A Zupanc
We report the first evidence for isospin violation in B→K^{*}γ and the first measurement of the difference of CP asymmetries between B^{+}→K^{*+}γ and B^{0}→K^{*0}γ. This analysis is based on the data sample containing 772×10^{6}BB[over ¯] pairs that was collected with the Belle detector at the KEKB energy-asymmetric e^{+}e^{-} collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ_{0+}=[+6.2±1.5(stat)±0.6(syst)±1.2(f_{+-}/f_{00})]%, where the third uncertainty is due to the uncertainty on the fraction of B^{+}B^{-} to B^{0}B[over ¯]^{0} production in ϒ(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is ΔA_{CP}=[+2.4±2.8(stat)±0.5(syst)]%, consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. We also calculate the ratio of branching fractions of B^{0}→K^{*0}γ to B_{s}^{0}→ϕγ.
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