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Abstract: We use a light-cone sum rule LCSR analysis of the branching ratios ofradiative meson decays to contrain the value of the magnetic susceptibility ofthe quark condensate $\chi\mu$. For the first time, we use a complete set ofthree-particle distribution amplitudes that enables us to give a consistentprediction for the branching ratios. Furthermore we will make use of a veryrecent update of several non-perturbative parameters. Our final result for$\chi\mu= 1 { m GeV}= 2.85 \pm 0.5 { m GeV}^{-2}$ assuming asymptotic wavefunctions agrees with the currently used value of $3.15 \pm 0.3 { mGeV}^{-2}$.



Autor: J. Rohrwild

Fuente: https://arxiv.org/







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