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Measurements of branching fractions for B --> K pi and B --> pi pi decays |
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| Authors: | 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 Bracko 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 H Itoh R Iwasaki M Iwasaki Y Kaji H Kapusta P Kataoka S U Kawai H Kawasaki T Kichimi H Kim Y J |
| Affiliation: | Department of Physics, National Taiwan University, Taipei, Taiwan. |
| Abstract: | We report measurements of branching fractions for B --> K pi and B --> pi pi decays based on a data sample of 449 x 10(6) BB[over] pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We also measure the ratios of partial widths for B-->Kpi decays, namely R(c) identical with 2Gamma(B(+) --> K(+) pi(0))/Gamma(B(+) --> K(0) pi(+)) = 1.08+/-0.06+/-0.08 and R(n) identical with Gamma(B(0) --> K(+) pi(-))/2 Gamma(B(0) --> K(0) pi(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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