Note on new interesting baryon channels to measure the photon polarization in b -> s gamma

Understand

At LHC a large number of b-flavored baryons will be produced.

• In this note we propose new baryon modes to determine the photon helicity of the penguin transition $b \to s \gamma$.
• The decay $\Lambda_b \to \Lambda \gamma$ has the drawback that the $\Lambda$, being neutral and long-lived, will escape detection most of the time.
• To overcome this difficulty, transitions of the type $\Lambda_b \to \Lambda^{*} \gamma$ have been proposed, where $\Lambda^{*}$ denotes an excited state decaying strongly within the detector into the clean mode $p K^-$.