B+ and Ds+ Decay Constants from Belle and Babar

Details B+ and Ds+ Decay Constants from Belle and Babar B+ and Ds+ Decay Constants from Belle and Babar

2009-09-24

arxiv.org/abs/0909.4473v1

AIP Conf.Proc.1182:299-308,2009

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 8 figures, 1 table, contribution to the Tenth Conference on the Intersections of Particle and Nuclear Physics (CIPAN

Scientific paper

10.1063/1.3293805

The Belle and Babar experiments have measured the branching fractions for B+
-> tau+ nu and Ds+ -> mu+ nu decays. From these measurements one can extract
the B+ and Ds+ decay constants, which can be compared to lattice QCD
calculations. For the Ds+ decay constant, there is currently a 2.1 sigma
difference between the calculated value and the measured value.

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