Extracting the σ-term from low-energy pion-nucleon scattering

被引：80

作者：

de Elvira, Jacobo Ruiz ^{[1
]}

Hoferichter, Martin ^{[2
]}

Kubis, Bastian ^{[3
,4
]}

Meissner, Ulf-G ^{[3
,4
,5
,6
]}

机构：

[1] Univ Bern, Inst Theoret Phys, Albert Einstein Ctr Fundamental Phys, Sidlerstr 5, CH-3012 Bern, Switzerland

[2] Univ Washington, Inst Nucl Theory, Seattle, WA 98195 USA

[3] Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theorie, D-53115 Bonn, Germany

[4] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

[5] Forschungszentrum Julich, Inst Kernphys, Inst Adv Simulat, D-52425 Julich, Germany

[6] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany

来源：

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2018年 / 45卷 / 02期

基金：

瑞士国家科学基金会;

关键词：

pion-baryon interactions; dispersion relations; pion-nucleon sigma-term; DIFFERENTIAL CROSS-SECTIONS; CHIRAL PERTURBATION-THEORY; ELECTRIC-DIPOLE MOMENTS; P ELASTIC-SCATTERING; ELECTROMAGNETIC CORRECTIONS; ISOSPIN VIOLATION; CHARGE-EXCHANGE; N SCATTERING; PRECISION CALCULATION; PI(-)D SCATTERING;

D O I：

10.1088/1361-6471/aa9422

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We present an extraction of the pion-nucleon (pi N) scattering lengths from low-energy pi N scattering, by fitting a representation based on Roy-Steiner equations to the low-energy data base. We show that the resulting values confirm the scattering-length determination from pionic atoms, and discuss the stability of the fit results regarding electromagnetic corrections and experimental normalization uncertainties in detail. Our results provide further evidence for a large pi N sigma-term, sigma(pi N) = 58(5) MeV, in agreement with, albeit less precise than, the determination from pionic atoms.

引用

页数：16

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