Lattice calculation of electromagnetic corrections to Kℓ3 decay
arxiv(2024)
摘要
We describe a first-principles method to apply lattice QCD to compute the
order α_EM corrections to K→πℓν_ℓ decay. This
method formulates the calculation in infinite volume with the conventional
infinite-volume, continuum treatment of QED. Infinite volume reconstruction is
used to replace the QCD components of the calculation with finite-volume
amplitudes which can be computed in Euclidean space using lattice QCD,
introducing finite-volume errors which vanish exponentially as the volume used
in the QCD calculation is increased. This approach has also been described in
an appendix to the recent paper: arXiv:2304.08026.
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