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Frontiers of Physics

ISSN 2095-0462

ISSN 2095-0470(Online)

CN 11-5994/O4

邮发代号 80-965

2018 Impact Factor: 2.483

Frontiers of Physics  2019, Vol. 14 Issue (2): 24501
On the existence of N*(890) resonance in S11 channel of πN scatterings
Yu-Fei Wang1, De-Liang Yao2(), Han-Qing Zheng1,3
1. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
2. Instituto de Física Corpuscular (centro mixto CSIC-UV), Institutos de Investigación de Paterna, Apartado 22085, 46071, Valencia, Spain
3. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
 全文: PDF(895 KB)  

Low-energy partial-wave πN 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(p3) chiral perturbative amplitudes obtained in the extended-onmass- shell scheme. In S11 and P11 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 S11 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 P11 virtual pole, as an accompanying partner of the nucleon bound-state pole, locates at zv = (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(p3) calculation greatly improves the fit quality comparing with the previous O(p2) one.

Key wordsdispersion relations    πN scatterings    nucleon resonance
收稿日期: 2018-11-24      出版日期: 2018-12-29
. [J]. Frontiers of Physics, 2019, 14(2): 24501.
Yu-Fei Wang, De-Liang Yao, Han-Qing Zheng. On the existence of N*(890) resonance in S11 channel of πN scatterings. Front. Phys. , 2019, 14(2): 24501.
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