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Observation of B(0)-->D(*-)tau(+)nu(tau) decay at Belle |
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| Authors: | Matyja A Rozanska M Adachi I Aihara H Aulchenko V Aushev T Bahinipati S Bakich A M Balagura V Barberio E Bedny I Bhardwaj V Bitenc U Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang M-C Chang P Chen A Chen K-F Cheon B G Chistov R Cho I-S Choi Y Choi Y K Dalseno J Dash M Eidelman S Fratina S Gabyshev N Golob B Ha H Haba J Hara T Hayasaka K Hazumi M Heffernan D Hokuue T Hoshi Y Hou W-S Hyun H J Iijima T Ikado K Inami K Ishikawa A Ishino H Itoh R Iwasaki Y Kaji H Kajiwara S Kang J H Katayama N Kawai H Kawasaki T Kichimi H Kim Y J Kinoshita K Korpar S Kozakai Y Krizan P Krokovny P Kumar R |
| Affiliation: | H Niewodniczanski Institute of Nuclear Physics, Krakow. |
| Abstract: | We report an observation of the decay B{0}-->D{*-}tau{+}nu{tau} in a data sample containing 535x10{6} BB pairs collected with the Belle detector at the KEKB asymmetric-energy e{+}e{-} collider. We find a signal with a significance of 5.2sigma and measure the branching fraction B(B{0}-->D{*-}tau{+}nu{tau})=(2.02{-0.37}{+0.40}(stat)+/-0.37(syst))%. This is the first observation of an exclusive B decay with a b-->ctaunu{tau} transition. |
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