Observation of B{sup 0}{yields}D*{sup -}{tau}{sup +}{nu}{sub {tau}} Decay at Belle

Journal Article · Fri Nov 09 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.191807· OSTI ID:21024415

Matyja, A; Rozanska, M; Bozek, A; Lesiak, T; Natkaniec, Z; Palka, H ^[1]; Adachi, I; Brodzicka, J; Haba, J; Hazumi, M; Itoh, R; Iwasaki, Y; Katayama, N; Kichimi, H; Krokovny, P; Nakamura, I; Nakao, M; Nishida, S; Nozaki, T; Ozaki, H ^[2]

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1. H. Niewodniczanski Institute of Nuclear Physics, Krakow (Poland)
2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

We report an observation of the decay B{sup 0}{yields}D*{sup -}{tau}{sup +}{nu}{sub {tau}} in a data sample containing 535x10{sup 6} BB pairs collected with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We find a signal with a significance of 5.2{sigma} and measure the branching fraction B(B{sup 0}{yields}D*{sup -}{tau}{sup +}{nu}{sub {tau}})=(2.02{sub -0.37}{sup +0.40}(stat){+-}0.37(syst)) = %. This is the first observation of an exclusive B decay with a b{yields}c{tau}{nu}{sub {tau}} transition.

• OSTI ID: 21024415
• Journal Information: Physical Review Letters, Vol. 99, Issue 19; Other Information: DOI: 10.1103/PhysRevLett.99.191807; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). Belle Collaboration; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B NEUTRAL MESONS
BRANCHING RATIO
D MINUS MESONS
PARTICLE DECAY
TAU NEUTRINOS
TAU PARTICLES