Analyses of pion-nucleon elastic scattering amplitudes up to O(p(4)) in the extended-on-mass-shell subtraction scheme

	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
刊名	PHYSICAL REVIEW D
	2013
卷号	87 期号:5 页码:54019
英文摘要	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
学科主题	Astronomy & Astrophysics; Physics
收录类别	SCI
WOS记录号	WOS:000316389600002
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224561]
专题	高能物理研究所_理论物理室
推荐引用方式 GB/T 7714	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.