Pion Induced Productions for the Study of Heavy Baryons

We study heavy baryon productions, $$\pi + p \rightarrow D^{*-} (\text {or }K^{*0}) + Y$$ , where Y is a charmed (or strange) baryon of the ground or excited states. We propose a new production mechanism where two quarks in the baryon participate in the reaction (the two-quark process), which enables the excitation of both the $$\rho $$ and $$\lambda $$ modes of the baryons. This feature differs from the one-quark process in the previous study, which excites only $$ \lambda $$ modes. We consider the two-quark process with the vector Reggeon exchange and the two-quark interaction inspired by the instanton model to study one vector meson and one heavy baryon productions. We compare the production rates of the ground states, the $$\rho $$ - and $$\lambda $$ -mode excitations of strange and charmed baryons for forward-angle scattering. We discuss structure and momentum transfer dependence of the production rates. We show that in the two-quark process both $$\lambda $$ and $$\rho $$ modes are abundantly produced unlike the one-quark process.