Determination of the magnetic susceptibility of the quark condensate using radiative heavy meson decays

TL;DR

This paper employs a light-cone sum rule approach with comprehensive distribution amplitudes to accurately determine the magnetic susceptibility of the quark condensate from radiative heavy meson decays.

Contribution

It introduces a complete set of three-particle distribution amplitudes for the first time in this context, providing a more consistent prediction of branching ratios.

Findings

Estimated $ ext{chi}( ext{1 GeV})$ as 2.85 ± 0.5 GeV$^{-2}$

Results align with the currently used value of 3.15 ± 0.3 GeV$^{-2}$

Utilizes updated non-perturbative parameters for improved accuracy.

Abstract

We use a light-cone sum rule (LCSR) analysis of the branching ratios of radiative meson decays to contrain the value of the magnetic susceptibility of the quark condensate $\chi(\mu)$. For the first time, we use a complete set of three-particle distribution amplitudes that enables us to give a consistent prediction for the branching ratios. Furthermore we will make use of a very recent update of several non-perturbative parameters. Our final result for $\chi(\mu= 1 {\rm GeV})= 2.85 \pm 0.5 {\rm GeV}^{-2}$ (assuming asymptotic wave functions) agrees with the currently used value of $3.15 \pm 0.3 {\rm GeV}^{-2}$.