Measurement of the electroweak penguin process B-->X(s)l+l

• Published in: Physical review letters Vol. 90; no. 2; p. 021801
• Main Authors: Kaneko, J, Abe, K, Abe, T, Adachi, I, Ahn, Byoung Sup, Aihara, H, Akatsu, M, Asano, Y, Aso, T, Aulchenko, V, Aushev, T, Bakich, A M, Ban, Y, Banas, E, Bartel, W, Bay, A, Behera, P K, Bondar, A, Bozek, A, Bracko, M, Brodzicka, J, Browder, T E, Casey, B C K, Chang, P, Chao, Y, Chen, K-F, Cheon, B G, Chistov, R, Choi, Y, Choi, Y K, Danilov, M, Dong, L Y, Eidelman, S, Eiges, V, Enari, Y, Everton, C W, Fang, F, Fujii, H, Fukunaga, C, Gabyshev, N, Garmash, A, Gershon, T, Guo, R, Haba, J, Handa, F, Hara, T, Harada, Y, Hastings, N C, Hayashii, H, Hazumi, M, Heenan, E M, Higuchi, I, Higuchi, T, Hinz, L, Hojo, T, Hoshi, Y, Hou, W-S, Huang, H-C, Igaki, T, Igarashi, Y, Iijima, T, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, H, Iwasaki, Y, Jang, H K, Kang, J H, Kang, J S, Katayama, N, Kawai, H, Kawakami, Y, Kawamura, N, Kawasaki, T, Kichimi, H, Kim, D W, Kim, Heejong, Kim, H J, Kim, H O, Kim, Hyunwoo, Kim, S K, Kinoshita, K, Kobayashi, S, Korpar, S, Krizan, P, Krokovny, P, Kulasiri, R, Kumar, S, Kwon, Y-J, Lange, J S, Leder, G, Lee, S H, Li, J, Limosani, A, Lu, R-S, MacNaughton, J, Majumder, G, Mandl, F
• Format: Journal Article
• Language: English
• Published: United States 17-01-2003
• ISSN: 0031-9007
• DOI: 10.1103/PhysRevLett.90.021801

We report the first measurement of the branching fraction for the inclusive decay B-->X(s)l(+)l(-), where l is either an electron or a muon, and X(s) is a hadronic recoil system that contains an s quark. We analyzed a data sample of 65.4 x 10(6) B meson pairs collected with the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider. We find B(B-->X(s)l(+)l(-))=[6.1 +/-1.4(stat) +1.4-1.1(syst)] x 10(-6) for dilepton masses greater than 0.2 GeV/c(2).