Physical observables in the decay ${\Lambda }_b\to {\Lambda }_c(\to \Lambda +\pi )+{\tau }^{-}+{\bar{\nu }}_{\tau }$

Abstract

We analyze the tauonic semileptonic baryon decays ${\Lambda }_b^0\to {\Lambda }_c^{+}+{\tau }^{-}+{\bar{\nu }}_{\tau }$ with particular emphasis on the lepton helicity flip contributions which vanish for zero lepton masses. We calculate the total rate, differential decay distributions, the longitudinal and transverse polarization components of the ${\Lambda }_c^{+}$ and the ${\tau }^{-}$, and the lepton-side forward-backward asymmetries. We use the covariant confined quark model to provide numerical results on these observables.

Comments: 6 pages, 1 figure. Talk given by Nurgul Habyl at the 9th joint International HADRON STRUCTURE'15 Conference, GRAND HOTEL BELLEVUE, Horny Smokovec, Slovak Republic, 29 June - 3 July, 2015