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• W2949155886 abstract "We present the results of our lattice QCD study of the $pigammatopipi$ process, where the $rho$ resonance appears as an enhancement in the transition amplitude. We use $N_f=2+1$ clover fermions on a lattice of $L=3.6$ fm and a pion mass of $320$ MeV. Using a combination of forward, stochastic, and sequential propagators, we calculate the two-point and three-point functions that allow us to determine the $pigammatopipi$ matrix elements for several values of the invariant mass $s$ and momentum transfer $q^2$. To fit the $q^2$ and $s$ dependence of the $pigammatopipi$ amplitude, we explore a set of general parametrizations based on a Taylor expansion. By analytic continuation to the complex pole corresponding to the $rho$ resonance, we determine the resonant form factors and calculate the radiative decay width of the $rho$." @default.
• W2949155886 created "2019-06-27" @default.
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• W2949155886 date "2018-11-25" @default.
• W2949155886 modified "2023-09-27" @default.
• W2949155886 title "Calculating the $rho$ radiative decay width with lattice QCD" @default.
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• W2949155886 hasPublicationYear "2018" @default.
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