Electromagnetic corrections to pseudoscalar decay constants
Benjamin Glaessle, Gunnar S. Bali (QCDSF Collaboration)
TL;DR
This paper investigates electromagnetic effects on pseudoscalar decay constants using lattice QED and QCD, providing precise preliminary results for light and charmed mesons.
Contribution
It introduces a method to resolve electromagnetic corrections to decay constants with high precision using a combined QED and QCD lattice approach.
Findings
Electromagnetic correction to f_pi^0 - f_pi^+/- is 0.09(3) MeV.
Electromagnetic correction to f_D^0 - f_D^+/- is 0.79(11) MeV.
Achieved resolution of about 0.1 MeV in decay constant differences.
Abstract
The effects of electromagnetic interactions on pseudoscalar decay constants are investigated. Using a compact QED and QCD action we are able to resolve differences of about 0.1 MeV. We obtain the preliminary results f_pi^0-f_pi^+/- =0.09(3) MeV and f_D^0-f_D^+/- =0.79(11) MeV for light and charmed pseudoscalar decay constants on a N_f=2 nonperturbatively improved Sheikholeslami-Wohlert ensemble.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Dark Matter and Cosmic Phenomena · Particle physics theoretical and experimental studies