Measurement of the lepton forward-backward asymmetry in B -> X(s)l(+)l(-) decays with a sum of exclusive modes

Sato, Y. ; Ishikawa, A. ; Yamamoto, H. ; Abdesselam, A. ; Adachi, I. ; Adamczyk, K. ; Aihara, H. ; Asner, D. M. ; Aulchenko, V. ; Aushev, T. ; Ayad, R. ; Bakich, A. M. ; Bala, A. ; Bhardwaj, V. ; Bhuyan, B. ; Bondar, A. ; Bonvicini, G. ; Bozek, A. ; Bracko, M. ; Browder, T. E. ; Cervenkov, D. ; Chekelian, V. ; Chen, A. ; Cheon, B. G. ; Cho, I. -S. ; Cho, K. ; Chobanova, V. ; Choi, Y. ; Cinabro, D. ; Dalseno, J. ; Danilov, M. ; Dolezal, Z. ; Drasal, Z. ; Drutskoy, A. ; Dutta, D. ; Dutta, K. ; Eidelman, S. ; Farhat, H. ; Fast, J. E. ; Ferber, T. ; Gaur, V. ; Garmash, A. ; Gillard, R. ; Goh, Y. M. ; Golob, B. ; Haba, J. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; He, X. H. ; Hoshi, Y. ; Hou, W. -S. ; Hyun, H. J. ; Iijima, T. ; Itoh, R. ; Iwasaki, Y. ; Iwashita, T. ; Jaegle, I. ; Julius, T. ; Kang, J. H. ; Kato, E. ; Kato, Y. ; Kawai, H. ; Kawasaki, T. ; Kichimi, H. ; Kim, D. Y. ; Kim, H. J. ; Kim, J. B. ; Kim, J. H. ; Kim, M. J. ; Kim, Y. J. ; Kinoshita, K. ; Klucar, J. ; Ko, B. R. ; Kodys, P. ; Korpar, S. ; Krizan, P. ; Krokovny, P. ; Kuhr, T. ; Kumita, T. ; Kuzmin, A. ; Kwon, Y. -J. ; Lee, S. -H. ; Li, Y. ; Libby, J. ; Liu, C. ; Liu, Y. ; Liu, Z. Q. ; Liventsev, D. ; Lukin, P. ; Miyata, H. ; Mizuk, R. ; Mohanty, G. B. ; Moll, A. ; Mussa, R. ; Nakao, M. ; Natkaniec, Z. ; Nayak, M. ; Nedelkovska, E. ; Nisar, N. K. ; Nishida, S. ; Nitoh, O. ; Ogawa, S. ; Pakhlov, P. ; Park, H. ; Park, H. K. ; Pedlar, T. K. ; Peng, T. ; Pestotnik, R. ; Petric, M. ; Piilonen, L. E. ; Ribezl, E. ; Ritter, M. ; Roehrken, M. ; Rostomyan, A. ; Sahoo, H. ; Saito, T. ; Sakai, Y. ; Sandilya, S. ; Santel, D. ; Santelj, L. ; Sanuki, T. ; Savinov, V. ; Schneider, O. ; Schnell, G. ; Schwanda, C. ; Schwartz, A. J. ; Seidl, R. ; Semmler, D. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shen, C. P. ; Shibata, T. -A. ; Shiu, J. -G. ; Shwartz, B. ; Sibidanov, A. ; Simon, F. ; Sohn, Y. -S. ; Sokolov, A. ; Solovieva, E. ; Stanic, S. ; Staric, M. ; Sumiyoshi, T. ; Tamponi, U. ; Tatishvili, G. ; Teramoto, Y. ; Trabelsi, K. ; Uchida, M. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Ushiroda, Y. ; Usov, Y. ; Vahsen, S. E. ; Van Hulse, C. ; Vanhoefer, P. ; Varner, G. ; Varvell, K. E. ; Vorobyev, V. ; Wang, C. H. ; Wang, M. -Z. ; Wang, P. ; Wang, X. L. ; Watanabe, Y. ; Won, E. ; Yamaoka, J. ; Yamashita, Y. ; Yashchenko, S. ; Yook, Y. ; Zhang, Z. P. ; Zhilich, V. ; Zhulanov, V. ; Zupanc, A. ; Belle Collaboration

We report the first measurement of the lepton forward-backward asymmetry A(FB) as a function of the squared four-momentum of the dilepton system, q(2), for the electroweak penguin process B -> X(s)l(+)l(-) with a sum of exclusive final states, where l is an electron or a muon and X-s is a hadronic recoil system with an s quark. The results are based on a data sample containing 772 x 10(6) B (B) over bar pairs recorded at the gamma (4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. A(FB) for the inclusive B -> X(s)l(+)l(-) is extrapolated from the sum of 10 exclusive X-s states whose invariant mass is less than 2 GeV/c(2). For q(2) > 10.2 GeV2/c(2), A(FB) < 0 is excluded at the 2.3 sigma level, where sigma is the standard deviation. For q(2) < 4.3 GeV2/c(2), the result is within 1.8 sigma of the standard model theoretical expectation.


Published in:
Physical Review D, 93, 3, 032008
Year:
2016
Publisher:
College Pk, Amer Physical Soc
ISSN:
2470-0010
Laboratories:




 Record created 2016-04-01, last modified 2018-12-03


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