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Analyses of pion-nucleon elastic scattering amplitudes up to O(p(4)) in the extended-on-mass-shell subtraction scheme
陈云华;Chen, YH; Yao, DL; Zheng, HQ
2013
发表期刊PHYSICAL REVIEW D
卷号87期号:5页码:54019
摘要We extend the analysis of elastic pion-nucleon scattering up to O(p(4)) level using the extended-on-mass-shell subtraction scheme within the framework of covariant baryon chiral perturbation theory. Numerical fits to partial wave phase shift data up to root s = 1.13 GeV are performed to pin down the free low energy constants. A good description of the existing phase shift data is achieved. We find a good convergence for the chiral series at O(p(4)), considerably improved with respect to the O(p(3))-level analyses found in previous literature. Also, the leading order contribution from explicit Delta(1232) resonance and partially-included Delta(1232) loop contribution are included to describe the phase shift data up to root s = 1.20 GeV. As phenomenological applications, we investigate chiral corrections to the Goldberger-Treiman relation and find that it converges rapidly, and the O(p(3)) correction is found to be very small: similar or equal to 0.2%. We also get a reasonable prediction of the pion-nucleon sigma term sigma(pi N) up to O(p(4)) by performing fits including both the pion-nucleon partial wave phase shift data and the lattice QCD data. We report that sigma(pi N) = 52 +/- 7 MeV from the fit without Delta(1232), and sigma(pi N) = 45 +/- 6 MeV from the fit with explicit Delta(1232). DOI: 10.1103/PhysRevD.87.054019
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.87.054019
收录类别SCI
WOS记录号WOS:000316389600002
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被引频次:33[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224561
专题理论物理室
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陈云华;Chen, YH,Yao, DL,Zheng, HQ. Analyses of pion-nucleon elastic scattering amplitudes up to O(p(4)) in the extended-on-mass-shell subtraction scheme[J]. PHYSICAL REVIEW D,2013,87(5):54019.
APA 陈云华;Chen, YH,Yao, DL,&Zheng, HQ.(2013).Analyses of pion-nucleon elastic scattering amplitudes up to O(p(4)) in the extended-on-mass-shell subtraction scheme.PHYSICAL REVIEW D,87(5),54019.
MLA 陈云华;Chen, YH,et al."Analyses of pion-nucleon elastic scattering amplitudes up to O(p(4)) in the extended-on-mass-shell subtraction scheme".PHYSICAL REVIEW D 87.5(2013):54019.
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