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

We use a light-cone sum rule (LCSR) analysis of the branching ratios of radiative meson decays to constrain 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. Further m ore we will make use of a very recent update of several non-perturbative parameters. Our final result for chi(mu = 1GeV)=2.85 +/- 0.5 GeV-2 (assuming asymptotic wave functions) agrees with the currently used value of 3.15 +/- 0.3 GeV-2.