2026-09-19T21:38:03Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1570712024-09-27T03:31:50Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Milner, Richard
Moran, Patrick
Massachusetts Institute of Technology. Department of Physics
2024-09-26T18:16:59Z
2024-09-26T18:16:59Z
2024-02
2024-08-18T13:57:28.188Z
https://hdl.handle.net/1721.1/157071
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.
Ph.D.
Massachusetts Institute of Technology
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Cross Section Measurement of Exclusive ϕ-Meson Electroproduction off the Proton at CLAS12
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<Title>Cross Section Measurement of Exclusive ϕ-Meson Electroproduction off the Proton at CLAS12</Title>
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<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.</Abstract>
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