Valence quark contributions for the {gamma}N{yields}P{sub 11}(1440) transition

Journal Article · Mon Oct 24 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3647158· OSTI ID:21608412

Ramalho, G ^[1]; Tsushima, K ^[2]

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1. Centro de Fisica Teorica de Particulas, Av. Rovisco Pais, 1049-001 Lisboa (Portugal)
2. Excited Baryon Analysis Center (EBAC) in Theory Center, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and CSSM, School of Chemistry and Physics, University of Adelaide, Adelaide SA 5005 (Australia)

A covariant spectator quark model is applied to estimate the valence quark contributions to the F{sub 1}{sup *}(Q{sup 2}) and F{sub 2}{sup *}(Q{sup 2}) transition form factors for the {gamma}N{yields}P{sub 11}(1440) reaction. The Roper resonance, P{sub 11}(1440), is assumed to be the first radial excitation of the nucleon. The model requires no extra parameters except for those already fixed by the previous studies for the nucleon. The results are consistent with the experimental data in the high Q{sup 2} region, and those from the lattice QCD. Finally the model is also applied to estimate the meson cloud contributions from the CLAS and MAID analysis.

• OSTI ID: 21608412
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1374; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BAG MODEL
BARYONS
BASIC INTERACTIONS
COMPOSITE MODELS
CONSTRUCTIVE FIELD THEORY
DIMENSIONLESS NUMBERS
ELECTROMAGNETIC INTERACTIONS
ELECTROPRODUCTION
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXTENDED PARTICLE MODEL
FERMIONS
FIELD THEORIES
FORM FACTORS
FOUR MOMENTUM TRANSFER
HADRONS
INTERACTIONS
LATTICE FIELD THEORY
MASS
MATHEMATICAL MODELS
MOMENTUM TRANSFER
N BARYONS
N*BARYONS
N-1440 BARYONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
REST MASS
VALENCE