====== 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]]   |
| |