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 (${\Xi }_{bc}^{(\prime \ast )}\to {\Xi }_{cc}^{(\ast )}$ and ${\Omega }_{bc}^{(\prime \ast )}\to {\Omega }_{cc}^{(\ast )}$), in the limit $m_b,m_c\gg {\Lambda }_{\mathrm{QCD}}$ 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.

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