The resonant amplitude from Quantum Chromodynamics
Jul 23, 2015
5 pages
Published in:
- Phys.Rev.Lett. 115 (2015) 242001
- Published: Dec 8, 2015
e-Print:
- 1507.06622 [hep-ph]
Report number:
- JLAB-THY-15-2106,
- DAMTP-2015-40
Citations per year
Abstract: (arXiv)
We present the first ab initio calculation of a radiative transition of a hadronic resonance within quantum chromodynamics (QCD). We compute the amplitude for , as a function of the energy of the pair and the virtuality of the photon, in the kinematic regime where couples strongly to the unstable resonance. This exploratory calculation is performed using a lattice discretization of QCD with quark masses corresponding to ~MeV. We obtain a description of the energy dependence of the transition amplitude, constrained at 48 kinematic points, that we can analytically continue to the pole and identify from its residue the form factor.Note:
- V2, version accepted for publication in PRL. More references added
- quark: mass
- pi pi
- photon pi
- quantum chromodynamics
- kinematics
- rho(770)
- star
- energy dependence
- form factor
- lattice
References(50)
Figures(4)
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