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
Ficenec, John R. Committee Co-Chair
Smith, Elton Committee Co-Chair
Mizutani, Tetsuro Committee Member
Pitt, Mark L. Committee Member
Tauber, Uwe C. Committee Member
Keywords
  • Electroproduction
  • Nucleon
  • GPDs
  • Vector Meson
Date of Defense 2004-08-05
Availability unrestricted
Abstract
This analysis studies the reaction ep ! e0p0Á in the kinematical range 1:6 · Q2 · 3:8

GeV2 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=Q4:6§1:7 which is compatible within errors to the Vector Meson

Dominance prediction of 1/Q4 as well as to the expected behavior of a quark and gluon

exchange-dominated model described by Generalized Parton Distributions of 1/Q6.

The differential cross section d¾d© 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 Q2 of 2:21 GeV2

which leads to a determination of the longitudinal cross section ¾L = 5:3 § 1:3 nb for

exclusive Á production.

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