Cross Section Measurement of Exclusive ϕ-Meson Electroproduction off the Proton at CLAS12
Name
moran-moranp-phd-physics-2024-thesis.pdf
Description
Thesis PDF
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14.94 MB
Format
Adobe PDF
Checksum (MD5)
583f4ca55099c603cf97c2815ae21351
Author(s)
Moran, Patrick
Advisor(s)
Milner, Richard
Date Issued
February 2024
Publisher
Massachusetts Institute of Technology
Abstract
This analysis studies the exclusive ϕ meson electroproduction process ep → e′p′ϕ at CLAS12 in the kinematic region 0.39 ≤ Q² ≤ 8.38 GeV², 1.97 ≤ W ≤ 4.03 GeV, and 0.17 ≤ −t ≤ 7.26GeV². Cross section σ(Q²,W) and differential cross section dσ/dt (Q²,W,t) measurements are reported. The scaling of the overall cross section was determined to be 1/Q⁶˙⁴⁷⁺⁻⁰˙⁹⁷, which is consistent with the Generalized Parton Distribution (GPD) prediction of 1/Q⁶. The ratios of the longitudinal and transverse cross sections, R = σL / σT , are extracted from the angular decay distributions for four values of Q² and are found to be consistent with the GPD scaling prediction. The mean-square gluonic radius of the proton ⟨b²⟩ subscript g is extracted from the t-dependence of the differential cross sections dσ / dt in the kinematic region 0.12 ≤ x subscript B ≤ 0.39, the first such measurement in the valence regime.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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