# Weak production of strange and charm ground-state baryons in nuclei

## TL;DR

This paper investigates the weak production of strange and charm hyperons in nuclei during neutrino interactions, highlighting the effects of hyperon propagation and model uncertainties on production rates relevant for neutrino experiments.

## Contribution

It provides a detailed analysis of hyperon production in nuclei, incorporating realistic nuclear models and hyperon propagation, and assesses uncertainties in charm hyperon production predictions.

## Key findings

- Hyperon propagation significantly alters production kinematics and rates.
- Non-zero $ ext{Sigma}^+$ production observed due to nuclear medium effects.
- Uncertainties in $ ext{Lambda}_c$ production linked to weak matrix element models.

## Abstract

We present results for the quasi-elastic weak production of $\Lambda$ and $\Sigma$ hyperons induced by $\bar{\nu}$ scattering off nuclei, in the kinematical region of interest for accelerator neutrino experiments. We employ realistic hole spectral functions and we describe the propagation of the hyperons in the nuclear medium by means of a Monte Carlo cascade. The latter strongly modifies the kinematics and the relative production rates of the hyperons, leading to a non-vanishing $\Sigma^+$ cross section, to a sizable enhancement of the $\Lambda$ production and to a drastic reduction of the $\Sigma^0$ and $\Sigma^-$ distributions. We also compute the quasi-elastic weak $\Lambda_c$ production cross section, paying special attention to estimate the uncertainties induced by the model dependence of the vacuum $n\to \Lambda_c$ weak matrix element. In this regard, the recent BESIII measurements of the branching ratios of $\Lambda_c\rightarrow \Lambda l^+\nu_l$ ($l=e,\mu$) are used to benchmark the available theoretical predictions.