Soft contribution to form factors of the {gamma}{sup {asterisk}}{ital p}{r_arrow}{Delta}{sup +} transition

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.53.6509· OSTI ID:284589

Belyaev, V M ^[1]; Radyushkin, A V ^[2]

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1. Continuous Electron Beam Accelerator Facility, Newport News, Virginia 23606 (United States)
2. Physics Department, Old Dominion University, Norfolk, Virginia 23529 (United States)

The purely nonperturbative soft contribution to the {gamma}{sup {asterisk}}{ital p}{r_arrow}{Delta}{sup +} transition form factors is estimated using a model based on the local quark-hadron duality. In this approach, the soft contribution is shown to be dominated by the magnetic transition: the ratio {ital G}{sub {ital E}}{sup {asterisk}}({ital Q}{sup 2})/{ital G}{sub {ital M}}{sup {asterisk}}({ital Q}{sup 2}) is small for all accessible {ital Q}{sup 2}, in contrast with PQCD expectation that {ital G}{sub {ital E}}{sup {asterisk}}({ital Q}{sup 2}){r_arrow}{minus}{ital G}{sub {ital M}}{sup {asterisk}}({ital Q}{sup 2}). We also found that the soft contribution to the magnetic form factor is large enough to explain the magnitude of existing experimental data. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Thomas Jefferson National Accelerator Facility
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 284589
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 53; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DELTA BARYONS
DUALITY
FORM FACTORS
HADRONS
M1-TRANSITIONS
MOMENTUM TRANSFER
PHOTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUARKS