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Observation of B(0)-->D(*-)tau(+)nu(tau) decay at Belle
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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