Generalized polarizabilities of the nucleon in baryon chiral perturbation theory

被引：18

作者：

Lensky, Vadim ^{[1
,2
,3
]}

Pascalutsa, Vladimir ^{[1
]}

Vanderhaeghen, Marc ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, Cluster Excellence PRISMA, D-55128 Mainz, Germany

[2] Inst Theoret & Expt Phys, Moscow 117218, Russia

[3] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow 115409, Russia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2017年 / 77卷 / 02期

关键词：

VIRTUAL COMPTON-SCATTERING; EFFECTIVE-FIELD THEORY; LOW-ENERGY; PROTON; EXPANSION; LIGHT;

D O I：

10.1140/epjc/s10052-017-4652-9

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The nucleon generalized polarizabilities (GPs), probed in virtual Compton scattering (VCS), describe the spatial distribution of the polarization density in a nucleon. They are accessed experimentally via the process of electronproton bremsstrahlung (ep -> ep.) at electron-beam facilities, such as MIT-Bates, CEBAF (Jefferson Lab), and MAMI (Mainz). We present the calculation of the nucleon GPs and VCS observables at next-to-leading order in baryon chiral perturbation theory (B chi PT), and confront the results with the empirical information. At this order our results are predictions, in the sense that all the parameters are well known from elsewhere. Within the relatively large uncertainties of our calculation we find good agreement with the experimental observations of VCS and the empirical extractions of the GPs. We find large discrepancies with previous chiral calculations -all done in heavy-baryon.PT (HB chi PT)-and discuss the differences between B chi PT and HB chi PT responsible for these discrepancies.

引用

页数：16

共 67 条

[1] Improved description of the πN-scattering phenomenology at low energies in covariant baryon chiral perturbation theory [J].

Alarcon, J. M. ;

Camalich, J. Martin ;

Oller, J. A. .

ANNALS OF PHYSICS, 2013, 336 :413-461

[2] Chiral representation of the πN scattering amplitude and the pion-nucleon sigma term [J].

Alarcon, J. M. ;

Camalich, J. Martin ;

Oller, J. A. .

PHYSICAL REVIEW D, 2012, 85 (05)

[3]

[Anonymous], ARXIVMATHPH0010025

[4] Baryon chiral perturbation theory in manifestly Lorentz invariant form [J].

Becher, T ;

Leutwyler, H .

EUROPEAN PHYSICAL JOURNAL C, 1999, 9 (04) :643-671

[5] ELECTRON-PROTON BREMSSTRAHLUNG [J].

BERG, RA ;

LINDNER, CN .

NUCLEAR PHYSICS, 1961, 26 (02) :259-&

[6] HIGH-ENERGY BREMSSTRAHLUNG IN ELECTRON-PROTON COLLISIONS [J].

BERG, RA ;

LINDNER, CN .

PHYSICAL REVIEW, 1958, 112 (06) :2072-2076

[7] New insights into the spin structure of the nucleon [J].

Bernard, Veronique ;

Epelbaum, Evgeny ;

Krebs, Hermann ;

Meissner, Ulf-G. .

PHYSICAL REVIEW D, 2013, 87 (05)

[8] JaxoDraw: A graphical user interface for drawing Feynman diagrams. Version 2.0 release notes [J].

Binosi, D. ;

Collins, J. ;

Kaufhold, C. ;

Theussl, L. .

COMPUTER PHYSICS COMMUNICATIONS, 2009, 180 (09) :1709-1715

[9] Measurements of the generalized electric and magnetic polarizabilities of the proton at low Q2 using the virtual-compton-scattering reaction [J].

Bourgeois, P. ;

Sato, Y. ;

Shaw, J. ;

Alarcon, R. ;

Bernstein, A. M. ;

Bertozzi, W. ;

Botto, T. ;

Calarco, J. ;

Casagrande, F. ;

Distler, M. O. ;

Dow, K. ;

Farkondeh, M. ;

Georgakopoulos, S. ;

Gilad, S. ;

Hicks, R. ;

Holtrop, M. ;

Hotta, A. ;

Jiang, X. ;

Karabarbounis, A. ;

Kirkpatrick, J. ;

Kowalski, S. ;

Milner, R. ;

Miskimen, R. ;

Nakagawa, I. ;

Papanicolas, C. N. ;

Sarty, A. J. ;

Sirca, S. ;

Six, E. ;

Sparveris, N. F. ;

Stave, S. ;

Stiliaris, E. ;

Tamae, T. ;

Tsentalovich, G. ;

Tschalaer, C. ;

Turchinetz, W. ;

Zhou, Z. -L. ;

Zwart, T. .

PHYSICAL REVIEW LETTERS, 2006, 97 (21)

[10] Measurements of the generalized electric and magnetic polarizabilities of the proton at low Q2 using the virtual Compton scattering reaction [J].