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Lowest resonance in QCD from low-energy data
Ametller Congost, Lluís; Talavera Sánchez, Pedro
Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. SC-SIMBIO - Sistemes complexos. Simulació discreta de materials i de sistemes biològics; Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica
We worked out a generalization of su(2) chiral perturbation theory, including a perturbative singlet scalar field. The approach suggests that the prediction for sensible low-energy observables converge faster towards their physical value. The physical mass and width of the scalar particle are obtained through a simultaneous analysis of the pion vector form factor and the ¿¿¿p 0 p 0 cross section. Both values are statistically consistent with the ones obtained by using Roy equations in p-p scattering. In addition we find indications that the photon-photon-singlet coupling is quite small.
Àrees temàtiques de la UPC::Física
Particles (Nuclear physics)--Chirality
QCD low-energy scalar resonance
Attribution-NonCommercial-NoDerivs 3.0 Spain
American Physical Society

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