Two-pion exchange currents in photodisintegration of the deuteron

Journal Article · Mon Oct 24 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3647153· OSTI ID:21608407

Rozp edzik, D; Golak, J ^[1]; Koelling, S ^[2]; Epelbaum, E ^[3]

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1. M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30059 Krakow (Poland)
2. Forschungszentrum Juelich, Institut fuer Kernphysik (IKP-3), D-52425 Juelich (Germany)
3. Institut fuer Theoretische Physik II, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)

Chiral effective field theory (ChEFT) is a modern framework to analyze the properties of few-nucleon systems at low energies. It is based on the most general effective Lagrangian for pions and nucleons consistent with the chiral symmetry of QCD. For energies below the pion-production threshold it is possible to eliminate the pionic degrees of freedom and derive nuclear potentials and nuclear current operators solely in terms of the nucleonic degrees of freedom. This is very important because, despite a lot of experience gained in the past, the consistency between two-nucleon forces, many-nucleon forces and the corresponding current operators has not been achieved yet. In this presentation we consider the recently derived long-range two-pion exchange (TPE) contributions to the nuclear current operator which appear at next-to leading order of the chiral expansion. These operators do not contain any free parameters. We study their role in the deuteron photodisintegration reaction and compare our predictions with experimental data from Refs [3]. The bound and scattering states are calculated using five different chiral N2LO nucleon-nucleon (NN) potentials which allows to estimate the theoretical uncertainty at a given order in the chiral expansion. For some observables the results are very close to the reference predictions based on the AV18 NN potential and the current operator (partly) consistent with this force.

• OSTI ID: 21608407
• Journal Information: AIP Conference Proceedings, Vol. 1374, Issue 1; Conference: MENU 2010: 12. international conference on meson-nucleon physics and the structure of the nucleon, Williamsburg, VA (United States), 31 May - 4 Jun 2010; Other Information: DOI: 10.1063/1.3647153; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
CHIRAL SYMMETRY
CHIRALITY
COMPARATIVE EVALUATIONS
DEGREES OF FREEDOM
DEUTERONS
LAGRANGIAN FIELD THEORY
LAGRANGIAN FUNCTION
NUCLEAR POTENTIAL
NUCLEON-NUCLEON INTERACTIONS
NUCLEON-NUCLEON POTENTIAL
NUCLEONS
PARTICLE PRODUCTION
PHOTONUCLEAR REACTIONS
PIONS
QUANTUM CHROMODYNAMICS
BARYON-BARYON INTERACTIONS
BARYONS
BOSONS
CHARGED PARTICLES
CURRENTS
ELEMENTARY PARTICLES
EVALUATION
FERMIONS
FIELD THEORIES
FUNCTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESONS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
POTENTIALS
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
SYMMETRY