Semileptonic bc to cc and bb to bc Baryon Decays and Heavy Quark Spin Symmetry

Abstract

We study the semileptonic decays of the lowest-lying $bc$ baryons to the lowest-lying $cc$ baryons ($\hat{I}{ž}_{bc}^{(\prime \ast )}\to \hat{I}{ž}_{cc}^{(\ast )}$ and $\hat{I}{\text{c◯}}_{bc}^{(\prime \ast )}\to \hat{I}{\text{c◯}}_{cc}^{(\ast )}$), in the limit $m_b,m_c\gg \hat{I}{›}_{\mathrm{QCD}}$ and close to the zero recoil point. The separate heavy quark spin symmetries make it possible to describe all these decays using a single form factor. We also show how these constraints can be used to test the validity of different quark model calculations. $bb$ to $bc$ baryon decays are also discussed.

4 latex pages. Talk given at The 5-th International Conference on Quarks and Nuclear Physics (QNP09), Beijing, September 2009