$\theta$-dependence of the lightest meson resonances in QCD

Feng-Kun Guo; Maxim Mai; Neramballi Ripunjay Acharya; Ulf-G. Mei{\ss}ner

arxiv: 1507.08570 · v1 · pith:VKGHJL3Nnew · submitted 2015-07-30 · ✦ hep-ph · hep-lat· hep-th· nucl-th

θ-dependence of the lightest meson resonances in QCD

Neramballi Ripunjay Acharya , Feng-Kun Guo , Maxim Mai , Ulf-G. Mei{\ss}ner This is my paper

classification ✦ hep-ph hep-lathep-thnucl-th

keywords mesonamplitudemasschiraldependencederiveelasticinverse

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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).

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