STI Publications - View Publication Form #15735
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Publication Information
| Title | Calculating the $\rho$ radiative decay width with lattice QCD | ||||
| Abstract | We present the results of our lattice QCD study of the $\pi\gamma\to\pi\pi$ process, where the $\rho$ resonance appears as an enhancement in the transition amplitude. We use $N_f=2+1$ 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 $\pi\gamma\to\pi\pi$ matrix elements for several values of the invariant mass $s$ and momentum transfer $q^2$. To fit the $q^2$ and $s$ dependence of the $\pi\gamma\to\pi\pi$ amplitude, we explore a set of general parametrizations based on a Taylor expansion. By analytic continuation to the complex pole corresponding to the $\rho$ resonance, we determine the resonant form factors and calculate the radiative decay width of the $\rho$. | ||||
| Author(s) | Luka Leskovec, Constantia Alexandrou, Stefan Meinel, John Negele, Srijit Paul, Marcus Petschlies, Andrew Pochinsky, Gumaro Rendon, Sergey Syritsyn | ||||
| Publication Date | May 2019 | ||||
| Document Type | Meeting, Proceedings | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Theory & Comp Physics / THEORY CENTER / THEORY CENTER | ||||
| Funding Source | Nuclear Physics (NP) | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | No | ||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Meeting / Conference
| Meeting Name | The 36th Annual International Symposium on Lattice Field Theory |
| Meeting Date | 7/22/2018 |
| Document Subtype | Paper (proceedings only) |
Proceedings
| Title | LATTICE2018 |
| Editor(s) | |
| Publisher | PoS |
| Refereed | No |
| Page Number | 65 |
| Year | 2018 |
Attachments/Datasets/DOI Link
| Document(s) |
leskovec_lattice18.pdf
(STI Document)
LATTICE2018_065.pdf
(Accepted Manuscript)
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| DOI Link | |
| Dataset(s) | (none) |
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