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 — preprints:1997:ttp97-38 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== 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. + + + |**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]]   | + | |