Semileptonic decay of double strangeness heavy flavor baryons

TL;DR

This study calculates semileptonic decay form factors of double strangeness heavy baryons using QCD light-cone sum rules, revealing significant discrepancies between different theoretical approaches and providing results consistent with other models.

Contribution

It applies QCD light-cone sum rules to compute decay form factors of $ ext{Omega}_c^0$ and $ ext{Omega}_b^-$ baryons, highlighting discrepancies between two LCSR methods.

Findings

Results with $ ext{Xi}$ baryon LCDAs agree with other models.

Results with double baryon LCDAs differ by orders of magnitude.

Significant discrepancies between two LCSR approaches.

Abstract

This paper investigates the double strangeness heavy flavor baryons $\Omega_c^0$ and $\Omega_b^-$, which contain two strange quarks. Using QCD light-cone sum rules (LCSRs), we calculate the form factors for the Cabibbo-suppressed processes $\Omega_c^0\to\Xi^-$ and $\Omega_b^-\to\Xi^0$, corresponding to the heavy-quark transitions $c\to d$ and $b\to u$, respectively. Combining these with the helicity amplitude formalism for semileptonic decay differential widths, we computed the branching fractions of their corresponding semileptonic decay processes. Our analysis reveals significant discrepancies between two versions of QCD LCSRs: one using the light-cone distribution amplitudes (LCDAs) of the final-state $\Xi$ baryon and the other using the LCDAs of the initial-state double strangeness heavy flavor baryons. The results obtained with the $\Xi$ baryon's LCDAs show excellent agreement with other theoretical calculations. However, when using the LCDAs of the double strangeness heavy flavor baryons, the results differ by orders of magnitude, warranting further investigation.