$K^0 \Lambda$ and $D^- \Lambda_c^+$ production induced by pion beams off the nucleon

TL;DR

This study compares pion-induced production of strange and charmed baryons off nucleons using a hybrid model, successfully reproducing known data and predicting significantly suppressed charm production.

Contribution

It introduces a hybrid effective Lagrangian-Regge model to analyze and compare strangeness and charm production in pion-nucleon interactions, providing new predictions for charm production rates.

Findings

The model accurately reproduces $K^0 \\Lambda$ production data.

Predicted $D^- \\Lambda_c^+$ production is 10^4 to 10^6 times smaller.

Charm production is highly suppressed compared to strangeness.

Abstract

We present a comparative study of the pion induced production of $K^0 \Lambda$ and $D^- \Lambda_c^+$ off the nucleon. A hybrid framework is utilized by combining an effective Lagrangian method with a Regge approach. We consider the $t$-channel process in a plannar diagram by vector-meson Reggeon exchanges and the $u$-channel one in a non-planar diagram by baryon Reggeon exchanges. The present model reproduces the $K^0 \Lambda$ production data well with a few parameters. Having fixed them, we predict the $D^- \Lambda_c^+$ production, which turns out to be about $10^4-10^6$ times smaller than the strangeness one, depending on the kinematical regions.