Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B →xsγ decays


Journal Article

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . 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.

Full Text

Duke Authors

Cited Authors

  • 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

Published Date

  • February 1, 2019

Published In

Volume / Issue

  • 99 / 3

Electronic International Standard Serial Number (EISSN)

  • 2470-0029

International Standard Serial Number (ISSN)

  • 2470-0010

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.99.032012

Citation Source

  • Scopus