Flavour Changing Neutral Current Decays of Heavy Baryons: The Case $Λ_b \to Λγ$

Details Flavour Changing Neutral Current Decays of Heavy Baryons: The Case $Λ_b \to Λγ$ Flavour Changing Neutral Current Decays of Heavy Baryons: The Case $Λ_b \to Λγ$

1997-01-28

arxiv.org/abs/hep-ph/9701399v1

J.Phys.G24:979-990,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 14 pages, 3 postscript figures included, uses epsf The complete paper, including figures, is also available via anonymo

Scientific paper

10.1088/0954-3899/24/5/006

We investigate the rare decay $\Lambda_b \to \Lambda \gamma$ which receives both short and long distance contributions. We estimate the long distance contributions and find them very small. The form factors are obtained from $\Lambda_c \to \Lambda \ell \bar{\nu}_\ell$ using heavy quark symmetry and a pole model. The short distance piece opens a window to new physics and we discuss the sensitivity of $\Lambda_b \to \Lambda \gamma$ to such effects.

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