# The Semileptonic Decay Fraction of B Mesons in the Light of Interfering Amplitudes

Source: [The Semileptonic Decay Fraction of B Mesons in the Light of Interfering Amplitudes](<https://www.sota2.com/research/paper/68fa34391e209131ce896d5a>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T20:31:20.587Z

Authors: K. Honscheid, R. Waldi, K. Schubert

Published: 1993-12-06T14:36:04.000Z

## Abstract

Consequences of the interference between spectator amplitudes for the lifetimes and semileptonic decay fractions of B^0 and B^+ mesons are discussed. Assuming duality and constructive interference between spectator amplitudes we are able to explain the low experimental value for the semileptonic decay fraction of $B$ mesons. Extracting these amplitudes from a fit to 11 exclusive hadronic B decay fractions we find   a\_1 = 1.05 +/- 0.03 +/- 0.10,   a\_2 =+0.227 +/ 0.012 +/- 0.022,  an inclusive semileptonic decay fraction of   (11.2 +/- 0.5 +/- 1.7),  and a lifetime ratio   tau(B^+) / tau(B^0) = 0.83 +/- 0.01 +/- 0.01.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ph/9312229>)

[PDF](<https://arxiv.org/pdf/hep-ph/9312229.pdf>)