Model for the {Delta}(1600) resonance and {gamma}N{yields}{Delta}(1600) transition

Journal Article · Fri Oct 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.073007· OSTI ID:21421348

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 (United States)

A covariant spectator constituent quark model is applied to study the {gamma}N{yields}{Delta}(1600) transition. Two processes are important in the transition: a photon couples to the individual quarks of the {Delta}(1600) core (quark core), and a photon couples to the intermediate pion-baryon states (pion cloud). While the quark core contributions are estimated assuming {Delta}(1600) as the first radial excitation of {Delta}(1232), the pion cloud contributions are estimated based on an analogy with the {gamma}N{yields}{Delta}(1232) transition. To estimate the pion cloud contributions in the {gamma}N{yields}{Delta}(1600) transition, we include the relevant intermediate states, {pi}N, {pi}{Delta}, {pi}N(1440) and {pi}{Delta}(1600). Dependence on the four-momentum transfer squared, Q{sup 2}, is predicted for the magnetic dipole transition form factor, G{sub M}*(Q{sup 2}), as well as the helicity amplitudes, A{sub 1/2}(Q{sup 2}) and A{sub 3/2}(Q{sup 2}). The results at Q{sup 2}=0 are compared with the existing data.

• OSTI ID: 21421348
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 7; Other Information: DOI: 10.1103/PhysRevD.82.073007; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
DELTA-1232 BARYONS
EXCITATION
FORM FACTORS
FOUR MOMENTUM TRANSFER
HELICITY
INTERMEDIATE STATE
M1-TRANSITIONS
PHOTONS
PIONS
QUARK MODEL
QUARKS
RESONANCE
BARYONS
BOSONS
COMPOSITE MODELS
DELTA BARYONS
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
FERMIONS
HADRONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESONS
MOMENTUM TRANSFER
MULTIPOLE TRANSITIONS
N*BARYONS
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS