QCD Sum Rules Calculation of Heavy $Λ$ Semileptonic Decay

Details QCD Sum Rules Calculation of Heavy $Λ$ Semileptonic Decay QCD Sum Rules Calculation of Heavy $Λ$ Semileptonic Decay

1997-12-11

arxiv.org/abs/hep-ph/9712350v2

Phys.Lett.B431:173-178,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version. Title changed. 11 pages (RevTex), 4 PS figures

Scientific paper

10.1016/S0370-2693(98)00566-8

We set up sum rules for heavy lambda decays in a full QCD calculation which
in the heavy quark mass limit incorporates the symmetries of heavy quark
effective theory. For the semileptonic $\La_c$ decay we obtain a reasonable
agreement with experiment. For the $\La_b$ semileptonic decay we find at the
zero recoil point a violation of the heavy quark symmetry of about 20%.

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