@Article{Wang_etal2018,
author="Wang, Y. F.
and Yao, D. L.
and Zheng, H. Q.",
title="New insights on low energy pi N scattering amplitudes",
journal="European Physical Journal C",
year="2018",
publisher="Springer",
volume="78",
number="7",
pages="543 - 18pp",
abstract="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.",
optnote="WOS:000438110400002",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3653), last updated on Tue, 24 Jul 2018 11:03:31 +0000",
issn="1434-6044",
doi="10.1140/epjc/s10052-018-6024-5",
opturl="http://arxiv.org/abs/1712.09257",
opturl="https://doi.org/10.1140/epjc/s10052-018-6024-5",
archivePrefix="arXiv",
eprint="1712.09257",
language="English"
}