A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition

G Ramalho, K Tsushima

doi:10.1103/PhysRevD.82.073007

Title: A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition

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Abstract

A covariant spectator constituent quark model is applied to study the gamma N -> 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 -> Delta(1232) transition. To estimate the pion cloud contributions in the gamma N -> 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, Q2, is predicted for the magnetic dipole transition form factor, GM*(Q2), as well as the helicity amplitudes, A_1/2(Q2) and A_3/2(Q2). The results at Q2=0 are compared with the existing data.

Authors:: G Ramalho, K Tsushima

Publication Date:: Fri Oct 01 00:00:00 EDT 2010

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 991227

Report Number(s):: JLAB-THY-10-1219; DOE/OR/23177-1271
Journal ID: ISSN 1550-7998; TRN: US1007471

DOE Contract Number:: AC05-06OR23177

Resource Type:: Journal Article

Journal Name:: Physical Review. D, Particles, Fields, Gravitation and Cosmology

Additional Journal Information:: Journal Volume: 82; Journal Issue: 7; Journal ID: ISSN 1550-7998

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; CLOUDS; EXCITATION; FORM FACTORS; HELICITY; M1-TRANSITIONS; PHOTONS; PIONS; QUARK MODEL; QUARKS; RESONANCE

Citation Formats


                    G Ramalho, K Tsushima. A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition.  United States: N. p., 2010. 
        Web.  doi:10.1103/PhysRevD.82.073007.

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                    G Ramalho, K Tsushima. A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition.  United States.  https://doi.org/10.1103/PhysRevD.82.073007

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                    G Ramalho, K Tsushima. 2010.  
        "A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition".  United States.  https://doi.org/10.1103/PhysRevD.82.073007.  https://www.osti.gov/servlets/purl/991227.

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@article{osti_991227,

  title        = {A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition},

  author       = {G Ramalho, K Tsushima},

  abstractNote = {A covariant spectator constituent quark model is applied to study the gamma N -> 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 -> Delta(1232) transition. To estimate the pion cloud contributions in the gamma N -> 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, Q2, is predicted for the magnetic dipole transition form factor, GM*(Q2), as well as the helicity amplitudes, A_1/2(Q2) and A_3/2(Q2). The results at Q2=0 are compared with the existing data.},

  doi          = {10.1103/PhysRevD.82.073007},

  url          = {https://www.osti.gov/biblio/991227},
  journal      = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},

  issn         = {1550-7998},

  number       = 7,

  volume       = 82,

  place        = {United States},

  year         = {Fri Oct 01 00:00:00 EDT 2010},

  month        = {Fri Oct 01 00:00:00 EDT 2010}

}

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