Charged pion photoproduction with the {Delta}(1232) baryon beyond the resonance region

Journal Article · Mon Aug 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.025203· OSTI ID:21596700

Nam, Seung-il; Yu, Byung-Geel ^[1]

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1. Research Institute for Basic Sciences, Korea Aerospace University, Goyang 412-791 (Korea, Republic of)

We investigate the charged pion photoproduction off the proton target with the {Delta}(1232) baryon, i.e., {gamma}p{yields}{pi}{sup -{Delta}++}(1232) and {gamma}p{yields}{pi}{sup +{Delta}0}(1232), based on the effective Lagrangian method, beyond the resonance region, {radical}(s) > or approx. 2 GeV. We employ the {pi}- and {rho}-meson Regge trajectories in the t channel, in addition to the proton and {Delta} pole, in the s and u channels, respectively, and the contact-interaction contributions. A specific scheme for the form factor which satisfies the Ward-Takahashi identity, crossing symmetry, and on-shell condition is taken into account. We also consider a smooth interpolation between the Regge and Feynman propagators for the t-channel meson exchanges as a function of the Mandelstam variable s. We present the numerical results for the energy and angular dependences of the cross sections and the double- and single-polarization observables. It turns out that the present framework reproduces the experimental data qualitatively very well. In particular, the interpolation between the two propagators plays a crucial role in reproducing the high-energy experimental data correctly. The {pi}{sup +} decay-angle distribution is also studied using the {Delta}{sup ++}-decay frame, i.e., the Gottfried-Jackson frame. The present results will be a useful guide for future high-energy photon-beam experiments.

• OSTI ID: 21596700
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BASIC INTERACTIONS
BEAMS
BOSON-EXCHANGE MODELS
BOSONS
CROSS SECTIONS
CROSSING SYMMETRY
DIMENSIONLESS NUMBERS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FORM FACTORS
FUNCTIONS
GEV RANGE
GEV RANGE 01-10
HADRONS
INTERACTIONS
INTERPOLATION
LAGRANGIAN FUNCTION
MATHEMATICAL MODELS
MATHEMATICAL SOLUTIONS
MESONS
NUCLEONS
NUMERICAL SOLUTION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PERIPHERAL MODELS
PHOTON BEAMS
PHOTOPRODUCTION
PIONS
POLARIZATION
PROTONS
PSEUDOSCALAR MESONS
REGGE TRAJECTORIES
RESONANCE
SYMMETRY
T CHANNEL