Speaker
Ashot Gasparyan
(Ruhr University, Bochum)
Description
Nucleon-nucleon interaction is studied using relativistic form of the chiral Lagrangian. Partial-wave amplitudes are computed in chiral perturbation theory at next-to-next-to-leading order in the subthreshold region. The most general constraints set by analyticity and unitarity are implemented to extrapolate the amplitudes into the physical region using the method developed in Refs. [1,2]. Empirical phase shifts are described up to laboratory energies T_{lab} approx 250 MeV. The issues related with renormalization and convergence of perturbation theory are investigated.
[1] A. Gasparyan, M. F. M. Lutz, Nucl. Phys. A848 (2010) 126-182.
[2] A. M. Gasparyan, M. F. M. Lutz and E. Epelbaum, Eur.Phys. J. A 49, 115 (2013)
Primary author
Ashot Gasparyan
(Ruhr University, Bochum)
Co-authors
Prof.
Evgeny Epelbaum
(Ruhr University of Bochum)
Prof.
Matthias Lutz
(GSI, Darmstadt)
