arXiv subjects

Manuel Vicente Vacas

Publications and source records attributed to Manuel Vicente Vacas.

2 recordsLinked to original sources

arXiv2015

Neutral pion photoproduction on protons in fully covariant ChPT with Delta(1232) loop contributions

We study the neutral pion photoproduction at near-threshold energies in fully covariant chiral perturbation theory up to O(p^3). When including only nucleonic virtual states in the model, the convergence is too slow. Therefore we test the model when introducing the Delta(1232) resonance as an additional degree of freedom. Some low-energy constants were fitted, converging to values in good agreement with those expected from literature.

hep-ph↗

arXiv2015

Threshold Neutral Pion Photoproduction on the Proton

The neutral pion photoproduction on the proton near threshold has a very small scattering cross section when compared to the charged channels, which in ChPT is explained by strong cancellations between the lowest order pieces. Therefore it is very sensitive to higher-order corrections of chiral perturbation theory. We perform a fully covariant calculation up to chiral order p^3 and we investigate the effect of the inclusion of the Delta(1232) resonance as an explicit degree of freedom. We show that the convergence improves, leading to a much better agreement with data at a wide range of energies.

hep-ph↗