The ρ radiative decay width from lattice QCD

Marcus Petschlies, Constantia Alexandrou, Luka Leskovec, Stefan Meinel, Gumaro Rendon, John W. Negele, Andrew Pochinsky, Srijit Paul, Sergey Syritsyn

Research output: Contribution to journalConference articlepeer-review


Pion photoproduction constitutes a prototype process, which allows for the study of the electro-weak decay of a QCD-unstable state, the ρ resonance. It is also the most straightforward process to investigate such (resonant) transition matrix elements in lattice QCD. We performed a lattice calculation of the process ππ → ρ → πγ, at presently the lightest pion mass of 317 MeV and in a large box of size (3.6 fm)3. In addition to outlining the method for our calculation, we give account of our analysis of systematic uncertainties, with focus on parametrization dependence of the P−wave phase shift and the analytic continuation of our lattice data to the ρ resonance pole to extract the coupling |Gρπγ | = 0.0802 (38).

Original languageEnglish (US)
Article number080
JournalProceedings of Science
StatePublished - 2018
Event9th International Workshop on Chiral Dynamics, CD 2018 - Durham, United States
Duration: Sep 17 2018Sep 21 2018

ASJC Scopus subject areas

  • General


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