Structure Functions of the Nucleon in a Covariant Scalar Spectator Model
نویسندگان
چکیده
Nucleon structure functions, as measured in deep-inelastic lepton scattering, are studied within a covariant scalar diquark spectator model. Regarding the nucleon as an approximate two-body bound state of a quark and diquark, the Bethe-Salpeter equation (BSE) for the bound state vertex function is solved in the ladder approximation. The valence quark distribution is discussed in terms of the solutions of the BSE. E-mail: kkusaka, awilliam, [email protected] [email protected]
منابع مشابه
Deep Inelastic Structure Functions in a Covariant Spectator Model
Deep-inelastic structure functions are studied within a covariant scalar diquark spectator model of the nucleon. Treating the target as a two-body bound state of a quark and a scalar diquark, the Bethe-Salpeter equation (BSE) for the bound state vertex function is solved in the ladder approximation. The valence quark distribution is discussed in terms of the solutions of the BSE. PACS numbers: ...
متن کاملA Covariant Description of the Deuteron and a Bunch of Other Stuff
A COVARIANT DESCRIPTION OF THE DEUTERON AND A BUNCH OF OTHER STUFF A. Student Old Dominion University, 2014 Director: Dr. John Doe An introduction to the use of Bethe-Salpeter and quasipotential equations in the description of electron scattering from the deuteron is provided. The basic formalism and many technical issues are introduced in the context of a simple scalar theory. Results for boun...
متن کاملRegarding proton form factors
The proton’s elastic electromagnetic form factors are calculated using an Ansatz for the nucleon’s Poincaré covariant Faddeev amplitude that only retains scalar diquark correlations. A spectator approximation is employed for the current. On the domain of q2 accessible in modern precision experiments these form factors are a sensitive probe of nonperturbative strong interaction dynamics. The rat...
متن کاملCovariant nucleon wave function with S, D, and P-state components
Expressions for the nucleon wave functions in the covariant spectator theory (CST) are derived. The nucleon is described as a system with a off-mass-shell constituent quark, free to interact with an external probe, and two spectator constituent quarks on their mass shell. Integrating over the internal momentum of the on-mass-shell quark pair allows us to derive an effective nucleon wave functio...
متن کاملSpin and angular momentum in the nucleon
Using the covariant spectator theory (CST), we present the results of a valence quark-diquark model calculation of the nucleon structure function f(x) measured in unpolarized deep inelastic scattering (DIS), and the structure functions g1(x) and g2(x) measured in DIS using polarized beams and targets. Parameters of the wave functions are adjusted to fit all the data. The fit fixes both the shap...
متن کامل