TY  - JOUR
AU  - Wang, Y. F.
AU  - Yao, D. L.
AU  - Zheng, H. Q.
PY  - 2019
DA  - 2019//
TI  - On the existence of N*(890) resonance in S-11 channel of N scatterings
T2  - Front. Phys.
JO  - Frontiers of Physics
SP  - 24501
EP  - 6pp
VL  - 14
IS  - 2
PB  - Higher Education Press
KW  - dispersion relations
KW  - N scatterings
KW  - nucleon resonance
AB  - Low-energy partial-wave N scattering data is reexamined with the help of the production representation of partial-wave S matrix, where branch cuts and poles are thoroughly under consideration. The left-hand cut contribution to the phase shift is determined, with controlled systematic error estimates, by using the results of O(p(3)) chiral perturbative amplitudes obtained in the extended-onmass- shell scheme. In S-11 and P-11 channels, severe discrepancies are observed between the phase shift data and the sum of all known contributions. Statistically satisfactory fits to the data can only be achieved by adding extra poles in the two channels. We find that a S-11 resonance pole locates at zr = (0:895-0:081)-(0:164-0:023)i GeV, on the complex s-plane. On the other hand, a P-11 virtual pole, as an accompanying partner of the nucleon bound-state pole, locates atzv = (0:966-0:018) GeV, slightly above the nucleon pole on the real axis below threshold. Physical origin of the two newly established poles is explored to the best of our knowledge. It is emphasized that the O(p(3)) calculation greatly improves the fit quality comparing with the previous O(p(2)) one.
SN  - 2095-0462
UR  - http://arxiv.org/abs/1810.07958
UR  - https://doi.org/10.1007/s11467-018-0877-9
DO  - 10.1007/s11467-018-0877-9
LA  - English
N1  - WOS:000454564100001
ID  - Wang_etal2019
ER  -