Transition from hadronic to partonic interactions for a composite spin-1/2 model of a nucleon

Tjon, J A; Wallace, S J

doi:10.1103/PhysRevC.62.065202

Title: Transition from hadronic to partonic interactions for a composite spin-1/2 model of a nucleon

Journal Article · Tue Feb 01 00:00:00 EST 2000 · Phys Rev

DOI:https://doi.org/10.1103/PhysRevC.62.065202· OSTI ID:754544

Tjon, J A; Wallace, S J

A simple model of a composite nucleon is developed in which a fermion and a boson, representing quark and diquark constituents of the nucleon, form a bound state owing to a contact interaction. Photon and pion couplings to the quark provide vertex functions for the photon and pion interactions with the composite nucleon. By a suitable choice of cutoff parameters of the model, realistic electromagnetic form factors are obtained. When a pseudoscalar pion-quark coupling is used, the pion-nucleon coupling is predominantly pseudovector. A virtual photopion amplitude is considered in which there are two types of contributions: hadronic contributions where the photon and pion interactions have an intervening propagator of the nucleon or its excited states, and contact-like contributions where the photon and pion interactions occur within a single vertex. At large Q, the contact-like contributions are dominant. The model nucleon exhibits scaling behavior in deep-inelastic scattering and the normalization of the parton distribution provides a rough normalization of the contact-like contributions. Calculations for the virtual photopion amplitude are performed using kinematics appropriate to its occurrence as a meson-exchange current in electron-deuteron scattering. The results show that the contact-like terms can dominate the meson-exchange current for Q > 1 GeV/c. There is a direct connection of the contact-like terms to the off-forward parton distributions of the model nucleon.

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

Sponsoring Organization:: USDOE Office of Energy Research (ER) (US)

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 754544

Report Number(s):: DOE/ER/40150-1384; JLAB-THY-00-06; UMD-PP-00-056; nucl-th/0002051

Journal Information:: Phys Rev, Vol. C, Issue 62; Other Information: PBD: 1 Feb 2000

Country of Publication:: United States

Language:: English

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