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

Date Issued
01-02-2019
Author(s)
Watanuki, S.
Ishikawa, A.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D. M.
Aushev, T.
Ayad, R.
Babu, V.
Badhrees, I.
Bakich, A. M.
Bansal, V.
Behera, P.
Beleño, C.
Berger, M.
Bhardwaj, V.
Bhuyan, B.
Bilka, T.
Biswal, J.
Bobrov, A.
Bonvicini, G.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
Cao, L.
ÄŒervenkov, D.
Chang, P.
Cheon, B. G.
Chilikin, K.
Cho, K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
Di Carlo, S.
Dingfelder, J.
Dong, T. V.
Eidelman, S.
Epifanov, D.
Fast, J. E.
Ferber, T.
Frey, A.
Fulsom, B. G.
Gaur, V.
Gabyshev, N.
Garmash, A.
Gelb, M.
Giri, A.
Goldenzweig, P.
Guan, Y.
Guido, E.
Haba, J.
Hayasaka, K.
Hayashii, H.
Hou, W. S.
Iijima, T.
Inami, K.
Inguglia, G.
Itoh, R.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jaegle, I.
Jeon, H. B.
Jia, S.
Jin, Y.
Joo, K. K.
Julius, T.
Karyan, G.
Kawasaki, T.
Kiesling, C.
Kim, D. Y.
Kim, J. B.
Kim, S. H.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Kotchetkov, D.
KriŽan, P.
Kroeger, R.
Krokovny, P.
Kuhr, T.
Kumar, R.
Kuzmin, A.
Kwon, Y. J.
Lee, I. S.
Lee, S. C.
Li, L. K.
Li, Y. B.
Li Gioi, L.
Indian Institute of Technology, Madras
Liventsev, D.
Lubej, M.
Luo, T.
Masuda, M.
Matsuda, T.
Merola, M.
Miyabayashi, K.
Miyata, H.
Mizuk, R.
DOI
Abstract
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.
Volume
99