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

2007/08/23 by J. Rohrwild · 2 citations
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1088/1126-6708/2007/09/073

published as JHEP 0709:073,2007 · 21 pages, 4 figures, references added

arxiv created 2007/08/23 · arxiv updated 2009/12/01

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 χ(μ). 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 χ(μ= 1 \rm GeV)= 2.85 ± 0.5 \rm GeV^-2 (assuming asymptotic wave functions) agrees with the currently used value of 3.15 ± 0.3 \rm GeV^-2.

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