Title page for ETD etd-08182004-145552


Type of Document Dissertation
Author Santoro, Joseph Peter
URN etd-08182004-145552
Title Electroproduction of Phi(1020) Mesons at High Q^2 with CLAS
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Elton Smith Committee Co-Chair
John Ficenec Committee Co-Chair
Mark Pitt Committee Member
Tetsuro Mizutani Committee Member
Uwe Tauber Committee Member
Keywords
  • Nucleon
  • GPDs
  • Vector Meson
  • Electroproduction
Date of Defense 2004-08-05
Availability unrestricted
Abstract
This analysis studies the reaction ep→ e'p'φ in the kinematical range 1.6 < Q˛ < 5.0 GeV˛ and 2.0 < W < 3.0 GeV˛ at CLAS.

After successful signal identification, total and differential cross sections are measured and compared to the world data set. Comparisons are

made to the predictions of the Jean-Marc Laget(JML) model based on Pomeron plus 2-gluon exchange.

The overall scaling of the total cross section was determined to be 1/Q^(4.6±1.7) which is compatible within errors to the

Vector Meson Dominance prediction of 1/Q^4 as well as to the expected behavior of a quark and gluon exchange-dominated model described

by Generalized Parton Distributions of 1/Q^6.

The differential cross section dσ/dΦ was used to determine that the s-channel helicity conservation (SCHC) assumption is valid within the precision of the current data.

SCHC leads to a simple expression for the decay angular distribution from which R, the ratio of the longitudinal to the transverse cross section, can be extracted.

Under the assumption of SCHC, we determine R=1.33 ±0.18 at an average Q˛ of 2.21 GeV˛ which leads to a determination of the longitudinal cross section

σL=5.3±1.3 nb for exclusive φ production.

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