Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B -> X-s gamma decays

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. ; Beleno, C. ; Berger, M. ; Bhardwaj, V ; Bhuyan, B. ; Bilka, T. ; Biswal, J. ; Bobrov, A. ; Bonvicini, G. ; Bozek, A. ; Bracko, M. ; Browder, T. E. ; Cao, L. ; Cervenkov, 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. ; Kodys, P. ; Korpar, S. ; Kotchetkov, D. ; Krizan, 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. ; Libby, J. ; Liventsev, D. ; Lubej, M. ; Luo, T. ; Masuda, M. ; Matsuda, T. ; Merola, M. ; Miyabayashi, K. ; Miyata, H. ; Mizuk, R. ; Mohanty, G. B. ; Mori, T. ; Nakao, M. ; Nanut, T. ; Nath, K. J. ; Niiyama, M. ; Nishida, S. ; Nishimura, K. ; Ogawa, K. ; Ogawa, S. ; Okuno, S. ; Ono, H. ; Ostrowicz, W. ; Pakhlov, P. ; Pakhlova, G. ; Pal, B. ; Park, H. ; Paul, S. ; Pedlar, T. K. ; Pestotnik, R. ; Piilonen, L. E. ; Prencipe, E. ; Ritter, M. ; Rostomyan, A. ; Russo, G. ; Sakai, Y. ; Sandilya, S. ; Santelj, L. ; Savinov, V ; Schneider, O. ; Schnell, G. ; Schueler, J. ; Schwanda, C. ; Schwartz, A. J. ; Seino, Y. ; Senyo, K. ; Seon, O. ; Shebalin, V ; Shibata, T-A ; Shiu, J-G ; Shwartz, B. ; Sokolov, A. ; Solovieva, E. ; Stanic, S. ; Staric, M. ; Sumiyoshi, T. ; Sutcliffe, W. ; Takizawa, M. ; Tanida, K. ; Taniguchi, N. ; Tenchini, F. ; Uchida, M. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Vahsen, S. E. ; Van Hulse, C. ; Van Tonder, R. ; Varner, G. ; Varvell, K. E. ; Vossen, A. ; Wang, B. ; Wang, C. H. ; Wang, M-Z ; Wang, P. ; Watanabe, M. ; Widmann, E. ; Won, E. ; Ye, H. ; Yin, J. H. ; Yusa, Y. ; Zakharov, S. ; Zhang, Z. P. ; Zhilich, V ; Zhukova, V ; Zhulanov, V ; Zupanc, A.

We report measurements of isospin asymmetry Delta(0-) and difference of direct CP asymmetries Delta A(CP) between charged and neutral B -> X-s gamma decays. This analysis is based on the data sample containing 772 x 10(6)B (B) over bar pairs that was collected with the Belle detector at the KEKB energy-asymmetric ethornecollider. Using a sum-of-exclusive technique with invariant X-s mass up to 2.8 GeV= c2, we obtain Delta(0-) = [0.48 +/- 1.49(stat) +/- 0.97(syst) +/- 1.15(f(+-)/f(00))]% and Delta A(CP) = [+3.69 +/- 2.65(stat) +/- 0.76(syst)]%, where the last uncertainty for.0-is due to the uncertainty on the production ratio of B+B- to B-0(B) over bar (0) in.o4Sthorn decays. The measured value of Delta(0-) is consistent with zero, allowing us to constrain the resolved photon contribution in the B -> X-s gamma, and improve the branching fraction prediction. The result for Delta A(CP) is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B -> X-s gamma decays. All the measurements are the most precise to date.


Published in:
Physical Review D, 99, 3, 032012
Year:
Feb 20 2019
ISSN:
2470-0010
2470-0029
Keywords:
Laboratories:




 Record created 2019-06-18, last modified 2019-12-05

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