The Baffling Semileptonic Branching Ratio of $B$ Mesons

Details The Baffling Semileptonic Branching Ratio of $B$ Mesons The Baffling Semileptonic Branching Ratio of $B$ Mesons

1993-11-23

arxiv.org/abs/hep-ph/9311339v2

Phys.Lett. B323 (1994) 408-416

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 Latex pages; 4 figures to be obtained from I.Bigi; preprint CERN-TH.7082/93; some misprints in the original version have be

Scientific paper

10.1016/0370-2693(94)91239-4

The apparent gap between the measured and the expected value for the semileptonic branching ratio of $B$ mesons has become more serious over the last year. This is due to the improved quality of the data and to the increasing maturity of the theoretical treatment of non-perturbative corrections. We discuss various theoretical options to reduce the semileptonic $B$ branching ratio; among the more spectacular resolutions of the apparent puzzle is the possibility of an unorthodox enhancement in non-perturbative corrections or even of an intervention by `New Physics'. Phenomenological implications of such scenarios are pointed out.

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