Virtual Compton scattering off the nucleon in chiral perturbation theory

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.2630· OSTI ID:467512

Hemmert, T R; Holstein, B R ^[1]; Knoechlein, G; Scherer, S ^[2]

---

1. Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
2. Institut fuer Kernphysik, Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany)

We investigate the spin-independent part of the virtual Compton scattering (VCS) amplitude off the nucleon within the framework of chiral perturbation theory. We perform a consistent calculation to third order in external momenta according to Weinberg`s power counting. With this calculation we can determine the second- and fourth-order structure-dependent coefficients of the general low-energy expansion of the spin-averaged VCS amplitude based on gauge invariance, crossing symmetry, and the discrete symmetries. We discuss the kinematical regime to which our calculation can be applied and compare our expansion with the multipole expansion by Guichon, Liu, and Thomas. We establish the connection of our calculation with the generalized polarizabilities of the nucleon where it is possible. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 467512
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHIRAL SYMMETRY
COMPTON EFFECT
CROSSING SYMMETRY
GAUGE INVARIANCE
MULTIPOLES
PERTURBATION THEORY
PHOTON-NUCLEON INTERACTIONS
POLARIZATION
SCATTERING AMPLITUDES
SPIN