TY  - JOUR
AU  - Wang, Y. F.
AU  - Yao, D. L.
AU  - Zheng, H. Q.
PY  - 2018
DA  - 2018//
TI  - New insights on low energy pi N scattering amplitudes
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 543 - 18pp
VL  - 78
IS  - 7
PB  - Springer
AB  - The S- and P- wave phase shifts of low-energy pion-nucleon scatterings are analysed using Peking University representation, in which they are decomposed into various terms contributing either from poles or branch cuts. We estimate the left-hand cut contributions with the help of tree-level perturbative amplitudes derived in relativistic baryon chiral perturbation theory up to O(p(2)). It is found that in S-11 and P-11 channels, contributions from known resonances and cuts are far from enough to saturate experimental phase shift data – strongly indicating contributions from low lying poles undiscovered before, and we fully explore possible physics behind. On the other side, no serious disagreements are observed in the other channels.
SN  - 1434-6044
UR  - http://arxiv.org/abs/1712.09257
UR  - https://doi.org/10.1140/epjc/s10052-018-6024-5
DO  - 10.1140/epjc/s10052-018-6024-5
LA  - English
N1  - WOS:000438110400002
ID  - Wang_etal2018
ER  -