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

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

Physics

Research output: Contribution to journal › Conference article › peer-review

Abstract

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 |G_ρπγ | = 0.0802 (38).

Original language	English (US)
Article number	080
Journal	Proceedings of Science
Volume	317
State	Published - 2018
Event	9th International Workshop on Chiral Dynamics, CD 2018 - Durham, United States Duration: Sep 17 2018 → Sep 21 2018

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Cite this

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title = "The ρ radiative decay width from lattice QCD",

abstract = "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).",

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language = "English (US)",

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journal = "Proceedings of Science",

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T1 - The ρ radiative decay width from lattice QCD

AU - Petschlies, Marcus

AU - Alexandrou, Constantia

AU - Leskovec, Luka

AU - Meinel, Stefan

AU - Rendon, Gumaro

AU - Negele, John W.

AU - Pochinsky, Andrew

AU - Paul, Srijit

AU - Syritsyn, Sergey

PY - 2018

Y1 - 2018

N2 - 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).

AB - 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).

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M3 - Conference article

AN - SCOPUS:85176806288

SN - 1824-8039

VL - 317

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 080

T2 - 9th International Workshop on Chiral Dynamics, CD 2018

Y2 - 17 September 2018 through 21 September 2018

ER -

The ρ radiative decay width from lattice QCD

Abstract

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