$\theta$-dependence of the lightest meson resonances in QCD
Abstract
We derive the pion mass and the elastic pion-pion scattering amplitude in the QCD theta-vacuum up to next-to-leading order in chiral perturbation theory. Using the modified inverse amplitude method, we study the theta-dependence of the mass and width of the light scalar meson sigma(500) and the vector meson rho(770).
- Publication:
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arXiv e-prints
- Pub Date:
- July 2015
- DOI:
- 10.48550/arXiv.1507.08570
- arXiv:
- arXiv:1507.08570
- Bibcode:
- 2015arXiv150708570R
- Keywords:
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- High Energy Physics - Phenomenology;
- High Energy Physics - Lattice;
- High Energy Physics - Theory;
- Nuclear Theory
- E-Print:
- 11 pages, 3 figures