Study of vector and axial-vector form factors and the decay parameters for the semileptonic hyperon decays

TL;DR

This paper analyzes the dependence of vector and axial-vector form factors on momentum transfer in hyperon semileptonic decays using the chiral constituent quark model, providing insights into decay parameters and CKM matrix elements.

Contribution

It introduces a detailed study of form factors and decay parameters in hyperon decays within the chiral constituent quark model, including the impact of $Q^2$ and the ratio of decay constants.

Findings

Dependence of form factors on $Q^2$ analyzed.

Calculated decay constants ratio $g_1(Q^2)/f_1(Q^2)$.

Estimated CKM matrix elements $V_{ud}$ and $V_{us}$.

Abstract

Using the standard parametrization of the dipole form, we have studied the vulnerability of $Q^2$ on the vector form factors ($f_i^{B_iB_f}(Q^2)$) and axial-vector form factors ($g_i^{B_iB_f}(Q^2)$), $i=1,2,3$ computed for the semileptonic $B_i \rightarrow B_f l \bar{\nu}$ decays for hyperons in the framework of chiral constituent quark model ($\chi$CQM). Both, strangeness changing as well as strangeness conserving decays have been examined. We also present the dependence of the ratio of hyperon semileptonic decay constants $g_1(Q^2)/f_1(Q^2)$ for these decays. Further, we calculate the CKM matrix elements $V_{ud}$ from strangeness conserving and $V_{us}$ from strangeness changing hyperon decays.