TY - JOUR
T1 - A study of the radiative transition ππ → πγ∗ with lattice QCD
AU - Leskovec, Luka
AU - Alexandrou, Constantia
AU - Koutsou, Giannis
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 ensemble generated with resources provided by XSEDE, which is supported by National Science Foundation grant number ACI- 1053575. Our calculations were performed at NERSC, supported by the U.S. DOE under Contract No. DE-AC02-05CH11231. SM and GR are supported by NSF grant PHY-1520996. SM and SS also thank the RIKEN BNL Research Center for support. JN was supported in part by the DOEOffice of Nuclear Physics under grant #DE-FG02-94ER40818. AP was supported in part by the U.S. Department of Energy Office of Nuclear Physics under grant #DE-FC02-06ER41444. SP is supported by the Horizon 2020 of the European Commission research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 642069.
Publisher Copyright:
© Copyright owned by the author(s).
PY - 2016
Y1 - 2016
N2 - Lattice QCD calculations of radiative transitions between hadrons have in the past been limited to processes of hadrons stable under the strong interaction. Recently developed methods for 1 → 2 transition matrix elements in a finite volume now enable the determination of radiative decay rates of strongly unstable particles. Our lattice QCD study focuses on the process ππ → πγ∗, where the ρ meson is present as an enhancement in the cross-section. We use 2+1 flavors of clover fermions at a pion mass of approximately 320 MeV and a lattice size of approximately 3.6 fm. The required 2-point and 3-point correlation functions are constructed from a set of forward, sequential and stochastic light quark propagators. In addition to determining the ρ meson resonance parameters via the Lüscher method, the scattering phase shift is used in conjunction with the 1 → 2 transition matrix element formalism of Briceño, Hansen and Walker-Loud [1] to compute the ππ → πγ∗ amplitude at several values of the momentum transfer and pp invariant mass.
AB - Lattice QCD calculations of radiative transitions between hadrons have in the past been limited to processes of hadrons stable under the strong interaction. Recently developed methods for 1 → 2 transition matrix elements in a finite volume now enable the determination of radiative decay rates of strongly unstable particles. Our lattice QCD study focuses on the process ππ → πγ∗, where the ρ meson is present as an enhancement in the cross-section. We use 2+1 flavors of clover fermions at a pion mass of approximately 320 MeV and a lattice size of approximately 3.6 fm. The required 2-point and 3-point correlation functions are constructed from a set of forward, sequential and stochastic light quark propagators. In addition to determining the ρ meson resonance parameters via the Lüscher method, the scattering phase shift is used in conjunction with the 1 → 2 transition matrix element formalism of Briceño, Hansen and Walker-Loud [1] to compute the ππ → πγ∗ amplitude at several values of the momentum transfer and pp invariant mass.
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M3 - Conference article
AN - SCOPUS:85025808731
SN - 1824-8039
VL - Part F128557
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 34th Annual International Symposium on Lattice Field Theory, LATTICE 2016
Y2 - 24 July 2016 through 30 July 2016
ER -