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A study of the radiative transition ππ → πγ∗ with lattice QCD
- Source :
- Proceedings of Science, 34th Annual International Symposium on Lattice Field Theory, LATTICE 2016
- Publication Year :
- 2016
- Publisher :
- Proceedings of Science (PoS), 2016.
-
Abstract
- 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. © Copyright owned by the author(s). Part F128557 Sponsors: Conference code: 128557
- Subjects :
- Transition matrix elements
Stochastic systems
Radiative transitions
High Energy Physics::Lattice
Lattice theory
Lattice QCD calculations
Elementary particles
Invariant mass
Strong interaction
Hadrons
Resonance parameters
Correlation function
Quantum theory
High Energy Physics::Experiment
Radiative decay rates
Transfer matrix method
Bosons
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Proceedings of Science, 34th Annual International Symposium on Lattice Field Theory, LATTICE 2016
- Accession number :
- edsair.od......4485..5cdbb32e48d56cf7dae00937c2c8e95e