Long-range electroweak amplitudes of single hadrons from Euclidean finite-volume correlation functions

Abstract

A relation is presented between single-hadron long-range matrix elements defined in a finite Euclidean spacetime, and the corresponding infinite-volume Minkowski amplitudes. This relation is valid in the kinematic region where any number of two-hadron states can simultaneously go on shell, so that the effects of strongly-coupled intermediate channels are included. These channels can consist of non-identical particles with arbitrary intrinsic spins. The result accommodates general Lorentz structures as well as non-zero momentum transfer for the two external currents inserted between the single-hadron states. The formalism, therefore, generalizes the work by Christ et al.~[Phys.Rev. D91 114510 (2015)], and extends the reach of lattice quantum chromodynamics (QCD) to a wide class of new observables beyond meson mixing and rare decays. Applications include Compton scattering of the pion ($\pi {\gamma }^{\star }\to [\pi \pi ,K\overline{K}]\to \pi {\gamma }^{\star }$), kaon ($K{\gamma }^{\star }\to [\pi K,\eta K]\to K{\gamma }^{\star }$) and nucleon ($N{\gamma }^{\star }\to N\pi \to N{\gamma }^{\star }$), as well as double-$\beta$ decays, and radiative corrections to the single-$\beta$ decay, of QCD-stable hadrons. The framework presented will further facilitate generalization of the result to studies of nuclear amplitudes involving two currents from lattice QCD.

arXiv comment25 pages, 9 figures

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