Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B →xsγ decays
We report measurements of isospin asymmetry Δ0- and difference of direct CP asymmetries ΔACP between charged and neutral B→Xsγ decays. This analysis is based on the data sample containing 772×106BB̄ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e- collider. Using a sum-of-exclusive technique with invariant Xs mass up to 2.8 GeV/c2, we obtain Δ0-=[-0.48±1.49(stat)±0.97(syst)±1.15(f+-/f00)]% and ΔACP=[+3.69±2.65(stat)±0.76(syst)]%, where the last uncertainty for Δ0- is due to the uncertainty on the production ratio of B+B- to B0B̄0 in Ï (4S) decays. The measured value of Δ0- is consistent with zero, allowing us to constrain the resolved photon contribution in the B→Xsγ, and improve the branching fraction prediction. The result for ΔACP is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B→Xsγ decays. All the measurements are the most precise to date.
Watanuki, S; Ishikawa, A; Adachi, I; Aihara, H; Al Said, S; Asner, DM; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bakich, AM; Bansal, V; Behera, P; Beleño, C; Berger, M; Bhardwaj, V; Bhuyan, B; Bilka, T; Biswal, J; Bobrov, A; Bonvicini, G; Bozek, A; Bračko, M; Browder, TE; Cao, L; Červenkov, D; Chang, P; Cheon, BG; Chilikin, K; Cho, K; Choi, Y; Choudhury, S; Cinabro, D; Cunliffe, S; Di Carlo, S; Dingfelder, J; Dong, TV; Eidelman, S; Epifanov, D; Fast, JE; Ferber, T; Frey, A; Fulsom, BG; Gaur, V; Gabyshev, N; Garmash, A; Gelb, M; Giri, A; Goldenzweig, P; Guan, Y; Guido, E; Haba, J; Hayasaka, K; Hayashii, H; Hou, WS; Iijima, T; Inami, K; Inguglia, G; Itoh, R; Iwasaki, M; Iwasaki, Y; Jacobs, WW; Jaegle, I; Jeon, HB; Jia, S; Jin, Y; Joo, KK; Julius, T; Karyan, G; Kawasaki, T; Kiesling, C; Kim, DY; Kim, JB; Kim, SH; Kinoshita, K; Kodyš, P; Korpar, S; Kotchetkov, D; KriŽan, P; Kroeger, R; Krokovny, P; Kuhr, T; Kumar, R; Kuzmin, A; Kwon, YJ; Lee, IS; Lee, SC; Li, LK; Li, YB; Li Gioi, L; Libby, J; Liventsev, D; Lubej, M; Luo, T; Masuda, M; Matsuda, T; Merola, M; Miyabayashi, K; Miyata, H; Mizuk, R
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