Return to search

Electroproduction of the Phi(1020) Vector Meson at 4 GeV

We studied the reaction 𝑒𝑝 β†’ π‘’β€²π‘β€²πœ™ with a 4.2 GeV incident electron beam in the region of the electroproduction variables QΒ² from 0.7 to 2.2 GeVΒ² 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 QΒ² and Ξ”πœ in πœ™ vector meson production. We find that the width of the forward πœ™-meson diffraction peak increases rapidly as the interaction time decreases below cΞ”πœ β‰ˆ 1 fm. Within a simple optical model framework, the data show that πœ™ meson has a smaller size than the 𝜌. The measured πœ™ cross-section dependence on QΒ² 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 𝑠𝑠̅-knockout model predictions. From the angular distribution of the decay πœ™ β†’ 𝐾⁺𝐾⁻, assuming the 𝑠-channel helicity conservation, we extracted the longitudinal-to-transverse cross-section ratio, 𝑅, and Vector Meson Dominance scaling parameter, πœ‰Β², which are consistent with the previous measurements and the model expectations. / Ph. D.

Identiferoai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/26172
Date16 February 2000
CreatorsLoukachine, Konstantin
ContributorsPhysics, Arndt, Richard A., Mizutani, Titzuro, Jenkins, David A., Pitt, Mark L., Ficenec, John R., Smith, Elton
PublisherVirginia Tech
Source SetsVirginia Tech Theses and Dissertation
Detected LanguageEnglish
TypeDissertation
Formatapplication/pdf
RightsIn Copyright, http://rightsstatements.org/vocab/InC/1.0/
Relationloukachine.pdf

Page generated in 0.0021 seconds