9 papers
Bootstrapping Two-Nucleon Effective Field Theories
Q. N. Micha-Mba, M. S. Sánchez, P. G. Ortega +2
Chiral EFT yields singular potentials that require regularization and renormalization when implemented in a dynamical equation such as the Lippmann--Schwinger equation. We employ t…
Contact potentials in presence of a regular finite-range interaction using dimensional regularization and the method
David R. Entem, Juan Nieves, Jose Antonio Oller
We solve the Lippman-Schwinger equation (LSE) with a kernel that includes a regular finite-range potential and additional contact terms with derivatives. We employ distorted wave t…
Coupled-channel formalism
José Antonio Oller
This article provides a pedagogical exploration of coupled-channel scattering in hadronic physics, focusing on theoretical methodologies, and practical applications. It covers key…
Isospin-breaking contribution to the model-independent axion-photon-photon coupling in chiral theory
Rui Gao, Jin Hao, Chun-Gui Duan +3
We pursue the calculation of the model-independent component of the axion-photon-photon coupling in the chiral perturbation theory up to next-to-leading order, with the emph…
Regulator-independent equations of state for neutron stars generated from first principles
J. M. Alarcón, E. Lope-Oter, J. A. Oller
We study the equation of state (EoS) of a neutron star (NS) accounting for new advances. In the low energy density, , with the saturation density, we use a new…
Lectures on scattering theory in partial-wave amplitudes
J. A. Oller
These lectures treat scattering theory from a non-perturbative point of view. The course begins with a review of formal aspects in scattering theory, discussing the in/out states a…
Unitarization of the one-loop graviton-graviton scattering amplitudes and study of the graviball
J. A. Oller, Marcela Peláez
From the graviton-graviton scattering amplitudes calculated perturbatively in quantum gravity to the one-loop order, we develop further a formalism that allows one to calculate inf…
Unitarization of electron scattering with an external potential at NLO in QED
J. A. Oller, Marcela Peláez
We have calculated the one-loop scattering amplitude of an electron by an external Coulomb potential in QED free of infrared divergences. This feature is achieved by applying the F…
Confronting the Lippmann-Schwinger equation and the method for coupled-wave separable potentials
M. S. Sánchez, J. A. Oller, D. R. Entem
We study a family of separable potentials with and without added contact interactions by solving the associated Lippmann-Schwinger equation with two coupled partial waves. The matc…