TY - JOUR
T1 - Calculating the ρ radiative decay width with lattice QCD
AU - Leskovec, Luka
AU - Alexandrou, Constantia
AU - Meinel, Stefan
AU - Negele, John W.
AU - Paul, Srijit
AU - Petschlies, Marcus
AU - Pochinsky, Andrew
AU - Rendon, Gumaro
AU - Syritsyn, Sergey
N1 - Funding Information:
We are grateful to Kostas Orginos for providing the gauge field ensemble, which was generated using resources provided by XSEDE (supported by National Science Foundation Grant No. ACI-1053575). LL was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. SM and GR were supported in part by National Science Foundation Grant No. PHY-1520996; SM and GR were also supported in part by the U.S. Department of Energy Office of High Energy Physics under Grant No. DE-SC0009913. SM and SS further acknowledge support by the RHIC Physics Fellow Program of the RIKEN BNL Research Center. JN and AP were supported in part by the U.S. Department of Energy Office of Nuclear Physics under Grant Nos. DE-SC-0011090 and DE-FC02-06ER41444. We acknowledge funding from the European Union’s Horizon 2020 research and innovation programme under the
Funding Information:
Marie Sklodowska-Curie grant agreement No 642069. SP is a Marie Sklodowska-Curie fellow supported by the HPC-LEAP joint doctorate program. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231.
Funding Information:
We are grateful to Kostas Orginos for providing the gauge field ensemble, which was generated using resources provided by XSEDE (supported by National Science Foundation Grant No. ACI-1053575). LL was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. SM and GR were supported in part by National Science Foundation Grant No. PHY-1520996; SM and GR were also supported in part by the U.S. Department of Energy Office of High Energy Physics under Grant No. DE-SC0009913. SM and SS further acknowledge support by the RHIC Physics Fellow Program of the RIKEN BNL Research Center. JN and AP were supported in part by the U.S. Department of Energy Office of Nuclear Physics under Grant Nos. DE-SC-0011090 and DE-FC02-06ER41444. We acknowledge funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 642069. SP is a Marie Sklodowska-Curie fellow supported by the HPC-LEAP joint doctorate program. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231.
Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons.
PY - 2018
Y1 - 2018
N2 - We present the results of our lattice QCD study of the πγ → ππ process, where the ρ resonance appears as an enhancement in the transition amplitude. We use Nf = 2 + 1 clover fermions on a lattice of L = 3.6 fm and a pion mass of 320 MeV. Using a combination of forward, stochastic, and sequential propagators, we calculate the two-point and three-point functions that allow us to determine the πγ → ππ matrix elements for several values of the invariant mass s and momentum transfer q2. To fit the q2 and s dependence of the πγ → ππ amplitude, we explore a set of general parametrizations based on a Taylor expansion. By analytic continuation to the complex pole corresponding to the ρ resonance, we determine the resonant form factors and calculate the radiative decay width of the ρ.
AB - We present the results of our lattice QCD study of the πγ → ππ process, where the ρ resonance appears as an enhancement in the transition amplitude. We use Nf = 2 + 1 clover fermions on a lattice of L = 3.6 fm and a pion mass of 320 MeV. Using a combination of forward, stochastic, and sequential propagators, we calculate the two-point and three-point functions that allow us to determine the πγ → ππ matrix elements for several values of the invariant mass s and momentum transfer q2. To fit the q2 and s dependence of the πγ → ππ amplitude, we explore a set of general parametrizations based on a Taylor expansion. By analytic continuation to the complex pole corresponding to the ρ resonance, we determine the resonant form factors and calculate the radiative decay width of the ρ.
UR - http://www.scopus.com/inward/record.url?scp=85069961454&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85069961454&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:85069961454
SN - 1824-8039
VL - 334
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 065
T2 - 36th Annual International Symposium on Lattice Field Theory, LATTICE 2018
Y2 - 22 July 2018 through 28 July 2018
ER -