Measurement of the differential branching fraction and forward-backward asymmetry for b→K(*)l+l-

J. T. Wei; P. Chang; I. Adachi; H. Aihara; V. Aulchenko; T. Aushev; A. M. Bakich; V. Balagura; E. Barberio; A. Bondar; A. Bozek; M. Bračko; T. E. Browder; Y. W. Chang; Y. Chao; A. Chen; K. F. Chen; B. G. Cheon; C. C. Chiang; I. S. Cho; Y. Choi; J. Dalseno; A. Drutskoy; W. Dungel; S. Eidelman; N. Gabyshev; P. Goldenzweig; B. Golob; H. Ha; B. Y. Han; K. Hayasaka; H. Hayashii; M. Hazumi; Y. Horii; Y. Hoshi; W. S. Hou; H. J. Hyun; T. Iijima; K. Inami; R. Itoh; M. Iwasaki; Y. Iwasaki; D. H. Kah; H. Kaji; J. H. Kang; P. Kapusta; N. Katayama; T. Kawasaki; H. Kichimi; H. J. Kim; H. O. Kim; S. K. Kim; Y. I. Kim; Y. J. Kim; K. Kinoshita; B. R. Ko; S. Korpar; P. Križan; P. Krokovny; A. Kuzmin; Y. J. Kwon; S. H. Kyeong; J. S. Lange; M. J. Lee; S. E. Lee; T. Lesiak; J. Li; A. Limosani; C. Liu; D. Liventsev; R. Louvot; F. Mandl; A. Matyja; S. McOnie; T. Medvedeva; K. Miyabayashi; H. Miyata; Y. Miyazaki; R. Mizuk; E. Nakano; M. Nakao; H. Nakazawa; Z. Natkaniec; S. Nishida; K. Nishimura; O. Nitoh; T. Nozaki; S. Ogawa; T. Ohshima; S. Okuno; H. Ozaki; G. Pakhlova; C. W. Park; H. Park; H. K. Park; K. S. Park; L. E. Piilonen; M. Rozanska; H. Sahoo; K. Sakai; Y. Sakai; O. Schneider; C. Schwanda; A. J. Schwartz; R. Seidl; A. Sekiya; K. Senyo; M. E. Sevior; M. Shapkin; C. P. Shen; J. G. Shiu; B. Shwartz; S. Stanič; M. Starič; T. Sumiyoshi; S. Suzuki; M. Tanaka; G. N. Taylor; Y. Teramoto; K. Trabelsi; S. Uehara; T. Uglov; Y. Unno; S. Uno; P. Urquijo; Y. Usov; G. Varner; K. E. Varvell; K. Vervink; C. C. Wang; C. H. Wang; M. Z. Wang; P. Wang; X. L. Wang; Y. Watanabe; R. Wedd; J. Wicht; E. Won; B. D. Yabsley; Y. Yamashita; M. Yamauchi; C. Z. Yuan; Z. P. Zhang; T. Zivko; A. Zupanc; O. Zyukova

doi:10.1103/PhysRevLett.103.171801

Measurement of the differential branching fraction and forward-backward asymmetry for b→K(*)l+l-

J. T. Wei, P. Chang, I. Adachi, H. Aihara, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura, E. Barberio, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, Y. W. Chang, Y. Chao, A. Chen, K. F. Chen, B. G. Cheon, C. C. Chiang, I. S. ChoY. Choi, J. Dalseno, A. Drutskoy, W. Dungel, S. Eidelman, N. Gabyshev, P. Goldenzweig, B. Golob, H. Ha, B. Y. Han, K. Hayasaka, H. Hayashii, M. Hazumi, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, K. Inami, R. Itoh, M. Iwasaki, Y. Iwasaki, D. H. Kah, H. Kaji, J. H. Kang, P. Kapusta, N. Katayama, T. Kawasaki, H. Kichimi, H. J. Kim, H. O. Kim, S. K. Kim, Y. I. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Korpar, P. Križan, P. Krokovny, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, J. S. Lange, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, A. Limosani, C. Liu, D. Liventsev, R. Louvot, F. Mandl, A. Matyja, S. McOnie, T. Medvedeva, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, K. Nishimura, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, H. Ozaki, G. Pakhlova, C. W. Park, H. Park, H. K. Park, K. S. Park, L. E. Piilonen, M. Rozanska, H. Sahoo, K. Sakai, Y. Sakai, O. Schneider, C. Schwanda, A. J. Schwartz, R. Seidl, A. Sekiya, K. Senyo, M. E. Sevior, M. Shapkin, C. P. Shen, J. G. Shiu, B. Shwartz, S. Stanič, M. Starič, T. Sumiyoshi, S. Suzuki, M. Tanaka, G. N. Taylor, Y. Teramoto, K. Trabelsi, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. E. Varvell, K. Vervink, C. C. Wang, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, Y. Watanabe, R. Wedd, J. Wicht, E. Won, B. D. Yabsley, Y. Yamashita, M. Yamauchi, C. Z. Yuan, Z. P. Zhang, T. Zivko, A. Zupanc, O. Zyukova

Department of Physics

Research output: Contribution to journal › Article › peer-review

453 Citations (Scopus)

Abstract

We study B→K(*)ℓ+ℓ- decays (ℓ=e, μ) based on a data sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB e+e- collider. We report the differential branching fraction, isospin asymmetry, K* polarization, and the forward-backward asymmetry (AFB) as functions of q2=Mℓ2c2. The fitted AFB spectrum exceeds the standard model expectation by 2.7 standard deviations. The measured branching fractions are B(B→K*ℓ+ℓ-)=(10.7-1.0+1.1±0.9)×10-7 and B(B→Kℓ+ℓ-)=(4.8-0.4+0.5±0.3)×10-7, where the first errors are statistical and the second are systematic, with the muon to electron ratios RK*=0.83±0.17±0.08 and RK=1.03±0.19±0. 06.

Original language	English
Article number	171801
Journal	Physical review letters
Volume	103
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.103.171801
Publication status	Published - 2009 Oct 20

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.103.171801

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Wei, J. T., Chang, P., Adachi, I., Aihara, H., Aulchenko, V., Aushev, T., Bakich, A. M., Balagura, V., Barberio, E., Bondar, A., Bozek, A., Bračko, M., Browder, T. E., Chang, Y. W., Chao, Y., Chen, A., Chen, K. F., Cheon, B. G., Chiang, C. C., ... Zyukova, O. (2009). Measurement of the differential branching fraction and forward-backward asymmetry for b→K(*)l+l-. Physical review letters, 103(17), Article 171801. https://doi.org/10.1103/PhysRevLett.103.171801

Wei, JT, Chang, P, Adachi, I, Aihara, H, Aulchenko, V, Aushev, T, Bakich, AM, Balagura, V, Barberio, E, Bondar, A, Bozek, A, Bračko, M, Browder, TE, Chang, YW, Chao, Y, Chen, A, Chen, KF, Cheon, BG, Chiang, CC, Cho, IS, Choi, Y, Dalseno, J, Drutskoy, A, Dungel, W, Eidelman, S, Gabyshev, N, Goldenzweig, P, Golob, B, Ha, H, Han, BY, Hayasaka, K, Hayashii, H, Hazumi, M, Horii, Y, Hoshi, Y, Hou, WS, Hyun, HJ, Iijima, T, Inami, K, Itoh, R, Iwasaki, M, Iwasaki, Y, Kah, DH, Kaji, H, Kang, JH, Kapusta, P, Katayama, N, Kawasaki, T, Kichimi, H, Kim, HJ, Kim, HO, Kim, SK, Kim, YI, Kim, YJ, Kinoshita, K, Ko, BR, Korpar, S, Križan, P, Krokovny, P, Kuzmin, A, Kwon, YJ, Kyeong, SH, Lange, JS, Lee, MJ, Lee, SE, Lesiak, T, Li, J, Limosani, A, Liu, C, Liventsev, D, Louvot, R, Mandl, F, Matyja, A, McOnie, S, Medvedeva, T, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mizuk, R, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Nishida, S, Nishimura, K, Nitoh, O, Nozaki, T, Ogawa, S, Ohshima, T, Okuno, S, Ozaki, H, Pakhlova, G, Park, CW, Park, H, Park, HK, Park, KS, Piilonen, LE, Rozanska, M, Sahoo, H, Sakai, K, Sakai, Y, Schneider, O, Schwanda, C, Schwartz, AJ, Seidl, R, Sekiya, A, Senyo, K, Sevior, ME, Shapkin, M, Shen, CP, Shiu, JG, Shwartz, B, Stanič, S, Starič, M, Sumiyoshi, T, Suzuki, S, Tanaka, M, Taylor, GN, Teramoto, Y, Trabelsi, K, Uehara, S, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Usov, Y, Varner, G, Varvell, KE, Vervink, K, Wang, CC, Wang, CH, Wang, MZ, Wang, P, Wang, XL, Watanabe, Y, Wedd, R, Wicht, J, Won, E, Yabsley, BD, Yamashita, Y, Yamauchi, M, Yuan, CZ, Zhang, ZP, Zivko, T, Zupanc, A & Zyukova, O 2009, 'Measurement of the differential branching fraction and forward-backward asymmetry for b→K(*)l+l-', Physical review letters, vol. 103, no. 17, 171801. https://doi.org/10.1103/PhysRevLett.103.171801

@article{473d14e1ffdd4692bb3419ba1d1121d0,

title = "Measurement of the differential branching fraction and forward-backward asymmetry for b→K(*)l+l-",

abstract = "We study B→K(*)ℓ+ℓ- decays (ℓ=e, μ) based on a data sample of 657×106 B{\=B} pairs collected with the Belle detector at the KEKB e+e- collider. We report the differential branching fraction, isospin asymmetry, K* polarization, and the forward-backward asymmetry (AFB) as functions of q2=Mℓ2c2. The fitted AFB spectrum exceeds the standard model expectation by 2.7 standard deviations. The measured branching fractions are B(B→K*ℓ+ℓ-)=(10.7-1.0+1.1±0.9)×10-7 and B(B→Kℓ+ℓ-)=(4.8-0.4+0.5±0.3)×10-7, where the first errors are statistical and the second are systematic, with the muon to electron ratios RK*=0.83±0.17±0.08 and RK=1.03±0.19±0. 06.",

author = "Wei, {J. T.} and P. Chang and I. Adachi and H. Aihara and V. Aulchenko and T. Aushev and Bakich, {A. M.} and V. Balagura and E. Barberio and A. Bondar and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and Chang, {Y. W.} and Y. Chao and A. Chen and Chen, {K. F.} and Cheon, {B. G.} and Chiang, {C. C.} and Cho, {I. S.} and Y. Choi and J. Dalseno and A. Drutskoy and W. Dungel and S. Eidelman and N. Gabyshev and P. Goldenzweig and B. Golob and H. Ha and Han, {B. Y.} and K. Hayasaka and H. Hayashii and M. Hazumi and Y. Horii and Y. Hoshi and Hou, {W. S.} and Hyun, {H. J.} and T. Iijima and K. Inami and R. Itoh and M. Iwasaki and Y. Iwasaki and Kah, {D. H.} and H. Kaji and Kang, {J. H.} and P. Kapusta and N. Katayama and T. Kawasaki and H. Kichimi and Kim, {H. J.} and Kim, {H. O.} and Kim, {S. K.} and Kim, {Y. I.} and Kim, {Y. J.} and K. Kinoshita and Ko, {B. R.} and S. Korpar and P. Kri{\v z}an and P. Krokovny and A. Kuzmin and Kwon, {Y. J.} and Kyeong, {S. H.} and Lange, {J. S.} and Lee, {M. J.} and Lee, {S. E.} and T. Lesiak and J. Li and A. Limosani and C. Liu and D. Liventsev and R. Louvot and F. Mandl and A. Matyja and S. McOnie and T. Medvedeva and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Nishida and K. Nishimura and O. Nitoh and T. Nozaki and S. Ogawa and T. Ohshima and S. Okuno and H. Ozaki and G. Pakhlova and Park, {C. W.} and H. Park and Park, {H. K.} and Park, {K. S.} and Piilonen, {L. E.} and M. Rozanska and H. Sahoo and K. Sakai and Y. Sakai and O. Schneider and C. Schwanda and Schwartz, {A. J.} and R. Seidl and A. Sekiya and K. Senyo and Sevior, {M. E.} and M. Shapkin and Shen, {C. P.} and Shiu, {J. G.} and B. Shwartz and S. Stani{\v c} and M. Stari{\v c} and T. Sumiyoshi and S. Suzuki and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and K. Trabelsi and S. Uehara and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and G. Varner and Varvell, {K. E.} and K. Vervink and Wang, {C. C.} and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and Wang, {X. L.} and Y. Watanabe and R. Wedd and J. Wicht and E. Won and Yabsley, {B. D.} and Y. Yamashita and M. Yamauchi and Yuan, {C. Z.} and Zhang, {Z. P.} and T. Zivko and A. Zupanc and O. Zyukova",

year = "2009",

month = oct,

day = "20",

doi = "10.1103/PhysRevLett.103.171801",

language = "English",

volume = "103",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "17",

}

TY - JOUR

T1 - Measurement of the differential branching fraction and forward-backward asymmetry for b→K(*)l+l-

AU - Wei, J. T.

AU - Chang, P.

AU - Adachi, I.

AU - Aihara, H.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Balagura, V.

AU - Barberio, E.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, Y. W.

AU - Chao, Y.

AU - Chen, A.

AU - Chen, K. F.

AU - Cheon, B. G.

AU - Chiang, C. C.

AU - Cho, I. S.

AU - Choi, Y.

AU - Dalseno, J.

AU - Drutskoy, A.

AU - Dungel, W.

AU - Eidelman, S.

AU - Gabyshev, N.

AU - Goldenzweig, P.

AU - Golob, B.

AU - Ha, H.

AU - Han, B. Y.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Horii, Y.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Inami, K.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kah, D. H.

AU - Kaji, H.

AU - Kang, J. H.

AU - Kapusta, P.

AU - Katayama, N.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kim, S. K.

AU - Kim, Y. I.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Ko, B. R.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Kyeong, S. H.

AU - Lange, J. S.

AU - Lee, M. J.

AU - Lee, S. E.

AU - Lesiak, T.

AU - Li, J.

AU - Limosani, A.

AU - Liu, C.

AU - Liventsev, D.

AU - Louvot, R.

AU - Mandl, F.

AU - Matyja, A.

AU - McOnie, S.

AU - Medvedeva, T.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nishimura, K.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Ozaki, H.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H.

AU - Park, H. K.

AU - Park, K. S.

AU - Piilonen, L. E.

AU - Rozanska, M.

AU - Sahoo, H.

AU - Sakai, K.

AU - Sakai, Y.

AU - Schneider, O.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Seidl, R.

AU - Sekiya, A.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shen, C. P.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Stanič, S.

AU - Starič, M.

AU - Sumiyoshi, T.

AU - Suzuki, S.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Varner, G.

AU - Varvell, K. E.

AU - Vervink, K.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, Y.

AU - Wedd, R.

AU - Wicht, J.

AU - Won, E.

AU - Yabsley, B. D.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yuan, C. Z.

AU - Zhang, Z. P.

AU - Zivko, T.

AU - Zupanc, A.

AU - Zyukova, O.

PY - 2009/10/20

Y1 - 2009/10/20

N2 - We study B→K(*)ℓ+ℓ- decays (ℓ=e, μ) based on a data sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB e+e- collider. We report the differential branching fraction, isospin asymmetry, K* polarization, and the forward-backward asymmetry (AFB) as functions of q2=Mℓ2c2. The fitted AFB spectrum exceeds the standard model expectation by 2.7 standard deviations. The measured branching fractions are B(B→K*ℓ+ℓ-)=(10.7-1.0+1.1±0.9)×10-7 and B(B→Kℓ+ℓ-)=(4.8-0.4+0.5±0.3)×10-7, where the first errors are statistical and the second are systematic, with the muon to electron ratios RK*=0.83±0.17±0.08 and RK=1.03±0.19±0. 06.

AB - We study B→K(*)ℓ+ℓ- decays (ℓ=e, μ) based on a data sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB e+e- collider. We report the differential branching fraction, isospin asymmetry, K* polarization, and the forward-backward asymmetry (AFB) as functions of q2=Mℓ2c2. The fitted AFB spectrum exceeds the standard model expectation by 2.7 standard deviations. The measured branching fractions are B(B→K*ℓ+ℓ-)=(10.7-1.0+1.1±0.9)×10-7 and B(B→Kℓ+ℓ-)=(4.8-0.4+0.5±0.3)×10-7, where the first errors are statistical and the second are systematic, with the muon to electron ratios RK*=0.83±0.17±0.08 and RK=1.03±0.19±0. 06.

UR - http://www.scopus.com/inward/record.url?scp=70350230397&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.103.171801

DO - 10.1103/PhysRevLett.103.171801

M3 - Article

AN - SCOPUS:70350230397

SN - 0031-9007

VL - 103

JO - Physical review letters

JF - Physical review letters

IS - 17

M1 - 171801

ER -

Measurement of the differential branching fraction and forward-backward asymmetry for b→K(*)l+l-

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