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+====== TTP97-38 Probing the helicity structure of $b\to s\gamma$ in $\Lambda_b \to \Lambda \gamma$ ======
+   <hidden TTP97-38  Probing the helicity structure of $b\to s\gamma$ in $\Lambda_b \to \Lambda \gamma$ > 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.
+ </hidden>
+|**Thomas Mannel and Stefan Recksiegel**  |
+|** Acta Phys. Polon. B28 2489-2493 1997  **  |
+| {{preprints:1997:ttp97-38.pdf|PDF}} {{preprints:1997:ttp97-38.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9710287|arXiv]]   |
+| |