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Observation of Cabibbo suppressed B --> D(*)K- decays at Belle |
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| Authors: | Abe K Abe K Adachi I Ahn B S Aihara H Akatsu M Alimonti G Asano Y Aso T Aulchenko V Aushev T Bakich A M Bartel W Behari S Behera P K Beiline D Bondar A Bozek A Browder T E Casey B C Chang P Chao Y Cheon B G Choi S K Choi Y Eidelman S Enari Y Enomoto R Fang F Fujii H Fukunaga C Fukushima M Garmash A Gordon A Gotow K Guo R Haba J Hamasaki H Hanagaki K Handa F Hara K Hara T Hastings N C Hayashii H Hazumi M Heenan E M Higuchi I Higuchi T Hirano H Hojo T Hoshi Y Hou W S Hsu S C Huang H C Igarashi Y Iijima T Ikeda H Inami K Ishikawa A Ishino H Itoh R Iwai G Iwasaki H Iwasaki Y Jackson D J Jalocha P |
| Affiliation: | High Energy Accelerator Research Organization (KEK), Tsukuba. |
| Abstract: | We report observations of the Cabibbo suppressed decays B-->D((*))K- using a 10.4 fb(-1) data sample accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) storage ring. We find that the ratios of Cabibbo suppressed to Cabibbo favored branching fractions are B(B--->D0K-)/B(B--->D0pi(-)) = 0.079+/-0.009+/-0.006, B(B(0)-->D+K-)/B(B(0)-->D+pi(-)) = 0.068+/-0.015+/-0.007, B(B--->D(*0)K-)/B(B--->D(*0)pi(-)) = 0.078+/-0.019+/-0.009, and B(B(0)-->D(*+)K-)/B(B(0)-->D(*+)pi(-)) = 0.074+/-0.015+/-0.006. These are the first observations of the B-->D+K-, D(*0)K-, and D(*+)K- decay processes. |
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