Spin Observables in Pion Photoproduction and Nucleon Compton Scattering from the Chiral Lagrangian and Dispersion Relations

被引：0

作者：

Gasparyan, A. M. ^{[1
,2
]}

Lutz, M. F. M. ^{[3
]}

Pasquini, B. ^{[4
,5
]}

机构：

[1] Ruhr Univ Bochum, Fac Phys & Astron, Inst Theoret Phys 2, D-44780 Bochum, Germany

[2] SSC RF ITEP, Bolshaya Cheremushkinskaya 25, Moscow 117218, Russia

[3] GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, D-64291 Darmstadt, Germany

[4] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy

[5] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

来源：

PROCEEDINGS OF THE 21ST INTERNATIONAL SYMPOSIUM ON SPIN PHYSICS (SPIN2014) | 2016年 / 40卷

关键词：

Compton scattering; pion photoproduction; chiral symmetry; spin observables; EFFECTIVE-FIELD THEORY; LIGHT VECTOR-MESONS;

D O I：

10.1142/S2010194516600661

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A scheme based on the chiral Lagrangian, analyticity and unitarity is applied to spin observables in pion photoproduction and nucleon Compton scattering. Subthreshold partial-wave amplitudes are calculated in chiral perturbation theory and extrapolated beyond the threshold region imposing the micro-causality and the unitarity constraint. A reasonable description of various spin observables up to energies root s similar or equal to 1300 MeV is obtained in terms of the parameters relevant at order Q(3) in the chiral Lagrangian. Nucleon spin-polarizabilities predicted in our scheme are consistent with recent measurements of double polarization asymmetries at MAMI.

引用

页数：4

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