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

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发表日期：

2024年5月20日

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Harleen Dahiya,
Aarti Girdhar,
Monika Randhawa

摘要

Using the standard parametrization of the dipole form, we have studied the vulnerability of $Q^2$ $Q^{2}$ on the vector form factors ( $f_i^{B_iB_f}(Q^2)$ $f_{i}^{B_{i} B_{f}} (Q^{2})$ ) and axial-vector form factors ( $g_i^{B_iB_f}(Q^2)$ $g_{i}^{B_{i} B_{f}} (Q^{2})$ ), $i=1,2,3$ $i = 1, 2, 3$ computed for the semileptonic $B_i \rightarrow B_f l \bar{\nu }$ $B_{i} \to B_{f} l \bar{ν}$ decays for hyperons in the framework of chiral constituent quark model ( $\chi$ $χ$ 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 $g_1(Q^2)/f_1(Q^2)$ $g_{1} (Q^{2}) / f_{1} (Q^{2})$ for these decays. Further, we calculate the CKM matrix elements $V_{ud}$ $V_{ud}$ from strangeness conserving and $V_{us}$ $V_{us}$ from strangeness changing hyperon decays.