TY  - JOUR
AU  - Alarcon, J. M.
AU  - Martin Camalich, J.
AU  - Oller, J. A.
AU  - Alvarez-Ruso, L.
PY  - 2011
DA  - 2011//
TI  - pi N scattering in relativistic baryon chiral perturbation theory reexamined
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 055205
EP  - 14pp
VL  - 83
IS  - 5
PB  - Amer Physical Soc
AB  - We have analyzed pion-nucleon scattering using the manifestly relativistic covariant framework of infrared regularization up to O(q(3)) in the chiral expansion, where q is a generic small momentum. We describe the low-energy phase shifts with a similar quality as previously achieved with heavy baryon chiral perturbation theory, root s less than or similar to 1.14 GeV. New values are provided for the O(q(2)) and O(q(3)) low-energy constants, which are compared with previous determinations. This is also the case for the scattering lengths and volumes. Finally, we have unitarized the previous amplitudes and as a result the energy range where data are reproduced increases significantly.
SN  - 0556-2813
UR  - http://arxiv.org/abs/1102.1537
UR  - https://doi.org/10.1103/PhysRevC.83.055205
DO  - 10.1103/PhysRevC.83.055205
LA  - English
N1  - ISI:000290717900006
ID  - Alarcon_etal2011
ER  -