Title page for ETD etd-02112000-17520002


Type of Document Dissertation
Author Loukachine, Konstantin
Author's Email Address costy@jlab.org
URN etd-02112000-17520002
Title Electroproduction of the Phi(1020) Vector Meson at 4 GeV.
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Ficenec, John R. Committee Co-Chair
Smith, Elton Committee Co-Chair
Arndt, Richard A. Committee Member
Jenkins, David A. Committee Member
Mizutani, Titzuro Committee Member
Pitt, Mark L. Committee Member
Keywords
  • electroproduction
  • vector meson
  • nucleon
  • strangeness
Date of Defense 2000-02-01
Availability unrestricted
Abstract
We studied the reaction ep -> e'p'phi with a

4.2 GeV incident electron beam in the region of

the electroproduction variables Q2 from 0.7 to

2.2 GeV2 and W from 2.0 to 2.6 GeV. The data

were taken and analyzed at the Thomas Jefferson

National Accelerator Facility. For the first time,

we observe the expected t-slope dependence on

Q2 and Delta-Tau in phi vector meson production.

We find that the width of the forward phi-meson

diffraction peak increases rapidly as the

interaction time decreases below cDelta-Tau of

1 fm. Within a simple optical model framework,

the data show that phi meson has a smaller size

than the rho. The measured phi cross-section

dependence on Q2 is in a good agreement with

previous measurements and well-described by the

phenomenological Pomeron exchange model. Our

cross-section data do not favor the standard

Vector Meson Dominance and ss-bar-knockout model

predictions. From the angular distribution of

the decay phi -> K+K-, assuming the s-channel

helicity conservation, we extracted the

longitudinal-to-transverse cross-section ratio,

R, and Vector Meson Dominance scaling parameter,

xi2, which are consistent with the previous

measurements and the model expectations.

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