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

Authors
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.
Issue Date
22-2월-2016
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v.93, no.3
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW D
Volume
93
Number
3
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/89487
DOI
10.1103/PhysRevD.93.032008
ISSN
2470-0010
Abstract
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.
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