@Article{Wang_etal2019,
author="Wang, Y. F.
and Yao, D. L.
and Zheng, H. Q.",
title="New insights on low energy pi N scattering amplitudes: comprehensive analyses at O (p(3)) level",
journal="Chinese Physics C",
year="2019",
publisher="Iop Publishing Ltd",
volume="43",
number="6",
pages="064110--22pp",
optkeywords="dispersion relations; pion-nucleon scattering; chiral perturbation theory",
abstract="A production representation of partial-wave S matrix is utilized to construct low-energy elastic pion-nucleon scattering amplitudes from cuts and poles on complex Riemann sheets. Among them, the contribution of left-hand cuts is estimated using the O (p(3)) results obtained in covariant baryon chiral perturbation theory within the extendedon-nass-shell scheme. By fitting to data on partial-wave phase shifts, it is indicated that the existences of hidden poles in S-11 and P-11 channels, as conjectured in our previous paper [Eur. Phys. J. C, 78(7): 543 (2018)], are firmly established. Specifically, the pole mass of the S-11 hidden resonance is determined to be (895 +/- 81)-(164 +/- 23)i MeV, whereas, the virtual pole in the P-11 channel locates at (966 +/- 18) MeV. It is found that analyses at the O (p(3)) level improves significantly the fit quality, comparing with the previous O (p(2)) one. Quantitative studies with cautious physical discussions are also conducted for the other S- and P-wave channels.",
optnote="WOS:000468501700013",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4020), last updated on Wed, 05 Jun 2019 11:00:29 +0000",
issn="1674-1137",
doi="10.1088/1674-1137/43/6/064110",
opturl="https://arxiv.org/abs/1811.09748",
opturl="https://doi.org/10.1088/1674-1137/43/6/064110",
language="English"
}