Measurements of branching fractions for bâ†KÏ€ and Bâ†Ï€Ï€ decays

S. W. Lin, P. Chang, K. Abe, K. Abe, I. Adachi, H. Aihara, D. Anipko, V. Aulchenko, T. Aushev, S. Bahinipati, A. M. Bakich, E. Barberio, I. Bedny, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. Bračko, T. E. BrowderM. C. Chang, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, J. Dalseno, M. Dash, J. Dragic, A. Drutskoy, S. Eidelman, S. Fratina, N. Gabyshev, A. Garmash, A. Go, B. Golob, H. Ha, J. Haba, T. Hara, H. Hayashii, M. Hazumi, D. Heffernan, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, T. Iijima, K. Ikado, A. Imoto, K. Inami, A. Ishikawa, Hirokazu Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kaji, P. Kapusta, S. U. Kataoka, H. Kawai, T. Kawasaki, H. Kichimi, Y. J. Kim, K. Kinoshita, S. Korpar, P. Kričan, P. Krokovny, R. Kulasiri, R. Kumar, A. Kuzmin, Y. J. Kwon, M. J. Lee, T. Lesiak, D. Liventsev, J. MacNaughton, F. Mandl, T. Matsumoto, S. McOnie, T. Medvedeva, W. Mitaroff, H. Miyake, H. Miyata, Y. Miyazaki, G. R. Moloney, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, R. Pestotnik, L. E. Piilonen, H. Sahoo, Y. Sakai, N. Satoyama, T. Schietinger, O. Schüneider, J. Schmann, A. J. Schwartz, K. Senyo, M. E. Sevior, M. Shapkin, H. Shibuya, B. Shwartz, J. B. Singh, A. Somov, N. Soni, S. Stanič, M. Starič, H. Stoeck, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, F. Takasaki, K. Tamai, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, I. Tikhomirov, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, S. Villa, C. C. Wang, C. H. Wang, M. Z. Wang, Y. Watanabe, J. Wicht, E. Won, Q. L. Xie, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, Y. Yusa, C. C. Zhang, Z. P. Zhang, A. Zupanc

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We report measurements of branching fractions for Bâ†KÏ € and Bâ†Ï€Ï€ decays based on a data sample of 449Ã-106 BB pairs collected at the Î¥(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We also measure the ratios of partial widths for Bâ†KÏ€ decays, namely Rcâ‰2Î"(B+â†K+Ï€0) /Î"(B+↠K0Ï€+)=1.08±0. 06±0.08 and Rnâ‰Î"(B0↠K+Ï€-)/2Î"(B0↠K0Ï€0)=1. 08±0.08±0.08, where the first and the second errors are statistical and systematic, respectively. These ratios are sensitive to enhanced electroweak penguin contributions from new physics; the new measurements are, however, consistent with standard model expectations.

Original languageEnglish
Article number121601
JournalPhysical Review Letters
Volume99
Issue number12
DOIs
Publication statusPublished - Sep 18 2007
Externally publishedYes

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decay
physics
detectors
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Lin, S. W., Chang, P., Abe, K., Abe, K., Adachi, I., Aihara, H., ... Zupanc, A. (2007). Measurements of branching fractions for bâ†KÏ€ and Bâ†Ï€Ï€ decays. Physical Review Letters, 99(12), [121601]. https://doi.org/10.1103/PhysRevLett.99.121601

Measurements of branching fractions for bâ†KÏ€ and Bâ†Ï€Ï€ decays. / Lin, S. W.; Chang, P.; Abe, K.; Abe, K.; Adachi, I.; Aihara, H.; Anipko, D.; Aulchenko, V.; Aushev, T.; Bahinipati, S.; Bakich, A. M.; Barberio, E.; Bedny, I.; Bitenc, U.; Bizjak, I.; Blyth, S.; Bondar, A.; Bozek, A.; Bračko, M.; Browder, T. E.; Chang, M. C.; Chao, Y.; Chen, A.; Chen, K. F.; Chen, W. T.; Cheon, B. G.; Chistov, R.; Choi, S. K.; Choi, Y.; Choi, Y. K.; Dalseno, J.; Dash, M.; Dragic, J.; Drutskoy, A.; Eidelman, S.; Fratina, S.; Gabyshev, N.; Garmash, A.; Go, A.; Golob, B.; Ha, H.; Haba, J.; Hara, T.; Hayashii, H.; Hazumi, M.; Heffernan, D.; Hokuue, T.; Hoshi, Y.; Hou, W. S.; Hsiung, Y. B.; Iijima, T.; Ikado, K.; Imoto, A.; Inami, K.; Ishikawa, A.; Ishino, Hirokazu; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kaji, H.; Kapusta, P.; Kataoka, S. U.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, Y. J.; Kinoshita, K.; Korpar, S.; Kričan, P.; Krokovny, P.; Kulasiri, R.; Kumar, R.; Kuzmin, A.; Kwon, Y. J.; Lee, M. J.; Lesiak, T.; Liventsev, D.; MacNaughton, J.; Mandl, F.; Matsumoto, T.; McOnie, S.; Medvedeva, T.; Mitaroff, W.; Miyake, H.; Miyata, H.; Miyazaki, Y.; Moloney, G. R.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Pestotnik, R.; Piilonen, L. E.; Sahoo, H.; Sakai, Y.; Satoyama, N.; Schietinger, T.; Schüneider, O.; Schmann, J.; Schwartz, A. J.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shibuya, H.; Shwartz, B.; Singh, J. B.; Somov, A.; Soni, N.; Stanič, S.; Starič, M.; Stoeck, H.; Sumisawa, K.; Sumiyoshi, T.; Suzuki, S.; Suzuki, S. Y.; Takasaki, F.; Tamai, K.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tian, X. C.; Tikhomirov, I.; Tsukamoto, T.; Uehara, S.; Ueno, K.; Unno, Y.; Uno, S.; Ushiroda, Y.; Varner, G.; Varvell, K. E.; Villa, S.; Wang, C. C.; Wang, C. H.; Wang, M. Z.; Watanabe, Y.; Wicht, J.; Won, E.; Xie, Q. L.; Yabsley, B. D.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Yusa, Y.; Zhang, C. C.; Zhang, Z. P.; Zupanc, A.

In: Physical Review Letters, Vol. 99, No. 12, 121601, 18.09.2007.

Research output: Contribution to journalArticle

Lin, SW, Chang, P, Abe, K, Abe, K, Adachi, I, Aihara, H, Anipko, D, Aulchenko, V, Aushev, T, Bahinipati, S, Bakich, AM, Barberio, E, Bedny, I, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bozek, A, Bračko, M, Browder, TE, Chang, MC, Chao, Y, Chen, A, Chen, KF, Chen, WT, Cheon, BG, Chistov, R, Choi, SK, Choi, Y, Choi, YK, Dalseno, J, Dash, M, Dragic, J, Drutskoy, A, Eidelman, S, Fratina, S, Gabyshev, N, Garmash, A, Go, A, Golob, B, Ha, H, Haba, J, Hara, T, Hayashii, H, Hazumi, M, Heffernan, D, Hokuue, T, Hoshi, Y, Hou, WS, Hsiung, YB, Iijima, T, Ikado, K, Imoto, A, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, M, Iwasaki, Y, Kaji, H, Kapusta, P, Kataoka, SU, Kawai, H, Kawasaki, T, Kichimi, H, Kim, YJ, Kinoshita, K, Korpar, S, Kričan, P, Krokovny, P, Kulasiri, R, Kumar, R, Kuzmin, A, Kwon, YJ, Lee, MJ, Lesiak, T, Liventsev, D, MacNaughton, J, Mandl, F, Matsumoto, T, McOnie, S, Medvedeva, T, Mitaroff, W, Miyake, H, Miyata, H, Miyazaki, Y, Moloney, GR, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Nishida, S, Nitoh, O, Ogawa, S, Ohshima, T, Okuno, S, Olsen, SL, Onuki, Y, Ozaki, H, Pakhlov, P, Pakhlova, G, Park, CW, Pestotnik, R, Piilonen, LE, Sahoo, H, Sakai, Y, Satoyama, N, Schietinger, T, Schüneider, O, Schmann, J, Schwartz, AJ, Senyo, K, Sevior, ME, Shapkin, M, Shibuya, H, Shwartz, B, Singh, JB, Somov, A, Soni, N, Stanič, S, Starič, M, Stoeck, H, Sumisawa, K, Sumiyoshi, T, Suzuki, S, Suzuki, SY, Takasaki, F, Tamai, K, Tanaka, M, Taylor, GN, Teramoto, Y, Tian, XC, Tikhomirov, I, Tsukamoto, T, Uehara, S, Ueno, K, Unno, Y, Uno, S, Ushiroda, Y, Varner, G, Varvell, KE, Villa, S, Wang, CC, Wang, CH, Wang, MZ, Watanabe, Y, Wicht, J, Won, E, Xie, QL, Yabsley, BD, Yamaguchi, A, Yamashita, Y, Yamauchi, M, Yusa, Y, Zhang, CC, Zhang, ZP & Zupanc, A 2007, 'Measurements of branching fractions for bâ†KÏ€ and Bâ†Ï€Ï€ decays', Physical Review Letters, vol. 99, no. 12, 121601. https://doi.org/10.1103/PhysRevLett.99.121601
Lin, S. W. ; Chang, P. ; Abe, K. ; Abe, K. ; Adachi, I. ; Aihara, H. ; Anipko, D. ; Aulchenko, V. ; Aushev, T. ; Bahinipati, S. ; Bakich, A. M. ; Barberio, E. ; Bedny, I. ; Bitenc, U. ; Bizjak, I. ; Blyth, S. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Browder, T. E. ; Chang, M. C. ; Chao, Y. ; Chen, A. ; Chen, K. F. ; Chen, W. T. ; Cheon, B. G. ; Chistov, R. ; Choi, S. K. ; Choi, Y. ; Choi, Y. K. ; Dalseno, J. ; Dash, M. ; Dragic, J. ; Drutskoy, A. ; Eidelman, S. ; Fratina, S. ; Gabyshev, N. ; Garmash, A. ; Go, A. ; Golob, B. ; Ha, H. ; Haba, J. ; Hara, T. ; Hayashii, H. ; Hazumi, M. ; Heffernan, D. ; Hokuue, T. ; Hoshi, Y. ; Hou, W. S. ; Hsiung, Y. B. ; Iijima, T. ; Ikado, K. ; Imoto, A. ; Inami, K. ; Ishikawa, A. ; Ishino, Hirokazu ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kaji, H. ; Kapusta, P. ; Kataoka, S. U. ; Kawai, H. ; Kawasaki, T. ; Kichimi, H. ; Kim, Y. J. ; Kinoshita, K. ; Korpar, S. ; Kričan, P. ; Krokovny, P. ; Kulasiri, R. ; Kumar, R. ; Kuzmin, A. ; Kwon, Y. J. ; Lee, M. J. ; Lesiak, T. ; Liventsev, D. ; MacNaughton, J. ; Mandl, F. ; Matsumoto, T. ; McOnie, S. ; Medvedeva, T. ; Mitaroff, W. ; Miyake, H. ; Miyata, H. ; Miyazaki, Y. ; Moloney, G. R. ; Nakano, E. ; Nakao, M. ; Nakazawa, H. ; Natkaniec, Z. ; Nishida, S. ; Nitoh, O. ; Ogawa, S. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Onuki, Y. ; Ozaki, H. ; Pakhlov, P. ; Pakhlova, G. ; Park, C. W. ; Pestotnik, R. ; Piilonen, L. E. ; Sahoo, H. ; Sakai, Y. ; Satoyama, N. ; Schietinger, T. ; Schüneider, O. ; Schmann, J. ; Schwartz, A. J. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shibuya, H. ; Shwartz, B. ; Singh, J. B. ; Somov, A. ; Soni, N. ; Stanič, S. ; Starič, M. ; Stoeck, H. ; Sumisawa, K. ; Sumiyoshi, T. ; Suzuki, S. ; Suzuki, S. Y. ; Takasaki, F. ; Tamai, K. ; Tanaka, M. ; Taylor, G. N. ; Teramoto, Y. ; Tian, X. C. ; Tikhomirov, I. ; Tsukamoto, T. ; Uehara, S. ; Ueno, K. ; Unno, Y. ; Uno, S. ; Ushiroda, Y. ; Varner, G. ; Varvell, K. E. ; Villa, S. ; Wang, C. C. ; Wang, C. H. ; Wang, M. Z. ; Watanabe, Y. ; Wicht, J. ; Won, E. ; Xie, Q. L. ; Yabsley, B. D. ; Yamaguchi, A. ; Yamashita, Y. ; Yamauchi, M. ; Yusa, Y. ; Zhang, C. C. ; Zhang, Z. P. ; Zupanc, A. / Measurements of branching fractions for bâ†KÏ€ and Bâ†Ï€Ï€ decays. In: Physical Review Letters. 2007 ; Vol. 99, No. 12.
@article{e6d7e458d9b44eabaca1526fbb04cba4,
title = "Measurements of branching fractions for b{\^a}†K{\"I}€ and B{\^a}†{\"I}€{\"I}€ decays",
abstract = "We report measurements of branching fractions for B{\^a}†K{\"I} € and B{\^a}†{\"I}€{\"I}€ decays based on a data sample of 449{\~A}-106 BB{\^A} pairs collected at the {\^I}¥(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We also measure the ratios of partial widths for B{\^a}†K{\"I}€ decays, namely Rc{\^a}‰2{\^I}{"}(B+{\^a}†K+{\"I}€0) /{\^I}{"}(B+{\^a}† K0{\"I}€+)=1.08{\^A}±0. 06{\^A}±0.08 and Rn{\^a}‰{\^I}{"}(B0{\^a}† K+{\"I}€-)/2{\^I}{"}(B0{\^a}† K0{\"I}€0)=1. 08{\^A}±0.08{\^A}±0.08, where the first and the second errors are statistical and systematic, respectively. These ratios are sensitive to enhanced electroweak penguin contributions from new physics; the new measurements are, however, consistent with standard model expectations.",
author = "Lin, {S. W.} and P. Chang and K. Abe and K. Abe and I. Adachi and H. Aihara and D. Anipko and V. Aulchenko and T. Aushev and S. Bahinipati and Bakich, {A. M.} and E. Barberio and I. Bedny and U. Bitenc and I. Bizjak and S. Blyth and A. Bondar and A. Bozek and M. Bračko and Browder, {T. E.} and Chang, {M. C.} and Y. Chao and A. Chen and Chen, {K. F.} and Chen, {W. T.} and Cheon, {B. G.} and R. Chistov and Choi, {S. K.} and Y. Choi and Choi, {Y. K.} and J. Dalseno and M. Dash and J. Dragic and A. Drutskoy and S. Eidelman and S. Fratina and N. Gabyshev and A. Garmash and A. Go and B. Golob and H. Ha and J. Haba and T. Hara and H. Hayashii and M. Hazumi and D. Heffernan and T. Hokuue and Y. Hoshi and Hou, {W. S.} and Hsiung, {Y. B.} and T. Iijima and K. Ikado and A. Imoto and K. Inami and A. Ishikawa and Hirokazu Ishino and R. Itoh and M. Iwasaki and Y. Iwasaki and H. Kaji and P. Kapusta and Kataoka, {S. U.} and H. Kawai and T. Kawasaki and H. Kichimi and Kim, {Y. J.} and K. Kinoshita and S. Korpar and P. Kričan and P. Krokovny and R. Kulasiri and R. Kumar and A. Kuzmin and Kwon, {Y. J.} and Lee, {M. J.} and T. Lesiak and D. Liventsev and J. MacNaughton and F. Mandl and T. Matsumoto and S. McOnie and T. Medvedeva and W. Mitaroff and H. Miyake and H. Miyata and Y. Miyazaki and Moloney, {G. R.} and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Nishida and O. Nitoh and S. Ogawa and T. Ohshima and S. Okuno and Olsen, {S. L.} and Y. Onuki and H. Ozaki and P. Pakhlov and G. Pakhlova and Park, {C. W.} and R. Pestotnik and Piilonen, {L. E.} and H. Sahoo and Y. Sakai and N. Satoyama and T. Schietinger and O. Sch{\"u}neider and J. Schmann and Schwartz, {A. J.} and K. Senyo and Sevior, {M. E.} and M. Shapkin and H. Shibuya and B. Shwartz and Singh, {J. B.} and A. Somov and N. Soni and S. Stanič and M. Starič and H. Stoeck and K. Sumisawa and T. Sumiyoshi and S. Suzuki and Suzuki, {S. Y.} and F. Takasaki and K. Tamai and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and Tian, {X. C.} and I. Tikhomirov and T. Tsukamoto and S. Uehara and K. Ueno and Y. Unno and S. Uno and Y. Ushiroda and G. Varner and Varvell, {K. E.} and S. Villa and Wang, {C. C.} and Wang, {C. H.} and Wang, {M. Z.} and Y. Watanabe and J. Wicht and E. Won and Xie, {Q. L.} and Yabsley, {B. D.} and A. Yamaguchi and Y. Yamashita and M. Yamauchi and Y. Yusa and Zhang, {C. C.} and Zhang, {Z. P.} and A. Zupanc",
year = "2007",
month = "9",
day = "18",
doi = "10.1103/PhysRevLett.99.121601",
language = "English",
volume = "99",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "12",

}

TY - JOUR

T1 - Measurements of branching fractions for bâ†KÏ€ and Bâ†Ï€Ï€ decays

AU - Lin, S. W.

AU - Chang, P.

AU - Abe, K.

AU - Abe, K.

AU - Adachi, I.

AU - Aihara, H.

AU - Anipko, D.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bahinipati, S.

AU - Bakich, A. M.

AU - Barberio, E.

AU - Bedny, I.

AU - Bitenc, U.

AU - Bizjak, I.

AU - Blyth, S.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, M. C.

AU - Chao, Y.

AU - Chen, A.

AU - Chen, K. F.

AU - Chen, W. T.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choi, Y. K.

AU - Dalseno, J.

AU - Dash, M.

AU - Dragic, J.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Fratina, S.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Go, A.

AU - Golob, B.

AU - Ha, H.

AU - Haba, J.

AU - Hara, T.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Heffernan, D.

AU - Hokuue, T.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Iijima, T.

AU - Ikado, K.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Ishino, Hirokazu

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kaji, H.

AU - Kapusta, P.

AU - Kataoka, S. U.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Korpar, S.

AU - Kričan, P.

AU - Krokovny, P.

AU - Kulasiri, R.

AU - Kumar, R.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lee, M. J.

AU - Lesiak, T.

AU - Liventsev, D.

AU - MacNaughton, J.

AU - Mandl, F.

AU - Matsumoto, T.

AU - McOnie, S.

AU - Medvedeva, T.

AU - Mitaroff, W.

AU - Miyake, H.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Moloney, G. R.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Satoyama, N.

AU - Schietinger, T.

AU - Schüneider, O.

AU - Schmann, J.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shibuya, H.

AU - Shwartz, B.

AU - Singh, J. B.

AU - Somov, A.

AU - Soni, N.

AU - Stanič, S.

AU - Starič, M.

AU - Stoeck, H.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Suzuki, S.

AU - Suzuki, S. Y.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Tikhomirov, I.

AU - Tsukamoto, T.

AU - Uehara, S.

AU - Ueno, K.

AU - Unno, Y.

AU - Uno, S.

AU - Ushiroda, Y.

AU - Varner, G.

AU - Varvell, K. E.

AU - Villa, S.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Watanabe, Y.

AU - Wicht, J.

AU - Won, E.

AU - Xie, Q. L.

AU - Yabsley, B. D.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yusa, Y.

AU - Zhang, C. C.

AU - Zhang, Z. P.

AU - Zupanc, A.

PY - 2007/9/18

Y1 - 2007/9/18

N2 - We report measurements of branching fractions for Bâ†KÏ € and Bâ†Ï€Ï€ decays based on a data sample of 449Ã-106 BB pairs collected at the Î¥(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We also measure the ratios of partial widths for Bâ†KÏ€ decays, namely Rcâ‰2Î"(B+â†K+Ï€0) /Î"(B+↠K0Ï€+)=1.08±0. 06±0.08 and Rnâ‰Î"(B0↠K+Ï€-)/2Î"(B0↠K0Ï€0)=1. 08±0.08±0.08, where the first and the second errors are statistical and systematic, respectively. These ratios are sensitive to enhanced electroweak penguin contributions from new physics; the new measurements are, however, consistent with standard model expectations.

AB - We report measurements of branching fractions for Bâ†KÏ € and Bâ†Ï€Ï€ decays based on a data sample of 449Ã-106 BB pairs collected at the Î¥(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We also measure the ratios of partial widths for Bâ†KÏ€ decays, namely Rcâ‰2Î"(B+â†K+Ï€0) /Î"(B+↠K0Ï€+)=1.08±0. 06±0.08 and Rnâ‰Î"(B0↠K+Ï€-)/2Î"(B0↠K0Ï€0)=1. 08±0.08±0.08, where the first and the second errors are statistical and systematic, respectively. These ratios are sensitive to enhanced electroweak penguin contributions from new physics; the new measurements are, however, consistent with standard model expectations.

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UR - http://www.scopus.com/inward/citedby.url?scp=34548790077&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.99.121601

DO - 10.1103/PhysRevLett.99.121601

M3 - Article

AN - SCOPUS:34548790077

VL - 99

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 12

M1 - 121601

ER -