Evidence for Isospin Violation and Measurement of CP Asymmetries in B -> K*(892)gamma

Horiguchi, T. ; Ishikawa, A. ; Yamamoto, H. ; Adachi, I. ; Aihara, H. ; Al Said, S. ; Asner, D. M. ; Aulchenko, V. ; Aushev, T. ; Ayad, R. ; Babu, V. ; Badhrees, I. ; Bakich, A. M. ; Bansal, V. ; Behera, P. ; Bhardwaj, V. ; Bhuyan, B. ; Biswal, J. ; Bobrov, A. ; Bonvicini, G. ; Bozek, A. ; Bracko, M. ; Browder, T. E. ; Cervenkov, D. ; Chekelian, V. ; Chen, A. ; Cheon, B. G. ; Chilikin, K. ; Cho, K. ; Choi, Y. ; Cinabro, D. ; Czank, T. ; Dash, N. ; Di Carlo, S. ; Dolezal, Z. ; Drasal, Z. ; Dutta, D. ; Eidelman, S. ; Epifanov, D. ; Farhat, H. ; Fast, J. E. ; Ferber, T. ; Fulsom, B. G. ; Gaur, V. ; Gabyshev, N. ; Garmash, A. ; Gelb, M. ; Gillard, R. ; Goldenzweig, P. ; Golob, B. ; Guan, Y. ; Guido, E. ; Haba, J. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; Hedges, M. T. ; Higuchi, T. ; Hirose, S. ; Hou, W. -S. ; Iijima, T. ; Inami, K. ; Inguglia, G. ; Itoh, R. ; Iwasaki, Y. ; Jacobs, W. W. ; Jaegle, I. ; Jeon, H. B. ; Jia, S. ; Jin, Y. ; Joffe, D. ; Joo, K. K. ; Julius, T. ; Kang, K. H. ; Kawasaki, T. ; Kim, D. Y. ; Kim, J. B. ; Kim, K. T. ; Kim, M. J. ; Kim, S. H. ; Kim, Y. J. ; Kinoshita, K. ; Kodys, P. ; Korpar, S. ; Kotchetkov, D. ; Krizan, P. ; Krokovny, P. ; Kuhr, T. ; Kulasiri, R. ; Kumar, R. ; Kumita, T. ; Kuzmin, A. ; Kwon, Y. -J. ; Lange, J. S. ; Li, C. H. ; Li, L. ; Gioi, L. Li ; Libby, J. ; Liventsev, D. ; Lubej, M. ; Luo, T. ; Masuda, M. ; Matsuda, T. ; Matvienko, D. ; Merola, M. ; Miyabayashi, K. ; Miyata, H. ; Mizuk, R. ; Mohanty, G. B. ; Mohanty, S. ; Moon, H. K. ; Mori, T. ; Mussa, R. ; Nakano, E. ; Nakao, M. ; Nanut, T. ; Nath, K. J. ; Natkaniec, Z. ; Nayak, M. ; Nisar, N. K. ; Nishida, S. ; Ogawa, S. ; Okuno, S. ; Ono, H. ; Pakhlov, P. ; Pakhlova, G. ; Pal, B. ; Pardi, S. ; Park, C. -S. ; Park, H. ; Paul, S. ; Pedlar, T. K. ; Pestotnik, R. ; Piilonen, L. E. ; Prasanth, K. ; Pulvermacher, C. ; Rauch, J. ; Rostomyan, A. ; Sakai, Y. ; Sandilya, S. ; Santelj, L. ; Savinov, V. ; Schneider, O. ; Schnell, G. ; Schwanda, C. ; Schwartz, A. J. ; Seino, Y. ; Senyo, K. ; Seong, I. S. ; Sevior, M. E. ; Shebalin, V. ; Shen, C. P. ; Shibata, T. -A. ; Shiu, J. -G. ; Simon, F. ; Sokolov, A. ; Solovieva, E. ; Staric, M. ; Strube, J. F. ; Sumisawa, K. ; Sumiyoshi, T. ; Takizawa, M. ; Tamponi, U. ; Tanida, K. ; Tenchini, F. ; Trabelsi, K. ; Uchida, M. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Ushiroda, Y. ; Usov, Y. ; Van Hulse, C. ; Varner, G. ; Vinokurova, A. ; Vorobyev, V. ; Vossen, A. ; Wang, C. H. ; Wang, M. -Z. ; Wang, P. ; Watanabe, Y. ; Watanuki, S. ; Weber, T. ; Widmann, E. ; Won, E. ; Yamashita, Y. ; Ye, H. ; Zhang, Z. P. ; Zhilich, V. ; Zhukova, V. ; Zhulanov, V. ; Zupanc, A.

We report the first evidence for isospin violation in B -> K*gamma and the first measurement of the difference of CP asymmetries between B+->.K*(+)gamma and B-0 -> K-*0 gamma. This analysis is based on the data sample containing 772 x 10(6)BB 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 3.1 sigma, Delta(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 (BB0)-B-0 production in gamma(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is Delta A(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 gamma to B-s(0) -> phi gamma.


Published in:
Physical Review Letters, 119, 19, 191802
Year:
2017
Publisher:
College Pk, Amer Physical Soc
ISSN:
0031-9007
Laboratories:




 Record created 2017-12-04, last modified 2018-12-03


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