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
- Vector Meson
Date of Defense 2004-08-05 Availability unrestricted AbstractThis 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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