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



Autor: A. J. Schwartz

Fuente: https://arxiv.org/







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