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Showing 1 to 20 of 25 for “"Electroproduction"”.
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Exclusive Backward-Angle Omega Meson Electroproduction
Exclusive meson electroproduction at different squared four-momenta of the exchanged virtual photon, Q^2 , and at different four-momentum transfers, t and u, can be used to probe QCD’s transition from hadronic degrees of freedom at the long distance scale to quark-gluon degrees of freedom at the …
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Electroproduction of Neutral Pion Off Helium-4
… in deeply virtual coherent neutral pion electroproduction, <em>e</em><sup>4</sup>He → <em>e′</em><sup>4</sup>He′π<sup>0</sup>, using the CLAS detector in the experimental Hall B at Thomas Jefferson National Accelerator Facility. The data were collected in 2009 with a 6 GeV longitudinally …
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Electroproduction of the Phi(1020) Vector Meson at 4 GeV
… 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 Δ𝜏 in 𝜙 …
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Electroproduction of Phi(1020) Mesons at High Q² with CLAS
This analysis studies the reaction ep → e′p′ϕ 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 …
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A study of the spin dependence of pion electroproduction near the [delta] region
This work studies two double polarized pion electroproduction reactions 1(e', e'p)o0 and H(e', e'r+)n near the A region at the MIT-Bates Linear Accelerator Center. With the Bates Large Acceptance Spectrometer Toroid (BLAST) detector package, data were collected simultaneously for both reaction …
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Cross Section Measurement of Exclusive ϕ-Meson Electroproduction off the Proton at CLAS12
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 …
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Search for the onset of color transparency through neutral rho meson electroproduction on nuclei
… for the onset of Color Transparency in rho0 electroproduction with the CLAS detector at Thomas Jefferson Laboratory. This experiment used two different targets simultaneously to reduce the systematic error and achieve a more precise measurement.The Nuclear Transparency was measured as a …
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Measurement of target single-spin asymmetry in charged kaon electroproduction on a transversely polarized 3He target
The subject of quark transverse spin and transverse momentum distribution are two current research frontier in understanding the spin structure of the nucleons. The goal of the research reported in this dissertation is to extract new information on the quark transversity distribution and the novel …
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Measurement of the Transverse Spin Polarization of the Lambda in Quasi-Real Photoproduction and Electroproduction at HERMES
The mystery of hadron polarization has been a source of both experimental and theoretical interest the last few decades. Measurements of polarizations in such particles as the Lambda particle have been done in proton-proton collisions, but studies in positron-proton scattering with high statistical …
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Induced final state proton polarization in neutral pion electroproduction near the [delta](1232) resonance at Q² = -0.126 GeV²/c²
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Measurement of the Deeply Virtual Neutral Pion Electroproduction Cross Section off the Proton at 10.6 GeV using the CLAS12 Detector
Deeply virtual exclusive reactions provide unique channels to study both transverse and longitudinal properties of the nucleon simultaneously, allowing for a 3D image of nucleon substructure. This presentation will discuss work towards extracting an absolute cross section for one such exclusive …
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Resonance contribution to electromagnetic structure functions
… and Gilman, of resonance production in inelastic electroproduction, the single resonance contribution to the pion and proton structure functions is expressed in terms of transition form factors. Froissart-Gribov representations of the Compton amplitude partial waves are presented and are used to …
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Measurement of nuclear transparency from A(e,e'[pi]⁺) reactions
… is produced with small transverse size. The pion electroproduction cross section from 1H, 2H,12C, 63Cu and 197Au targets from Q2 = 1.1 to 4.8 (GeV/c)2 was measured in Jefferson Laboratory Experiment E01-107. The nuclear transparency was formed by the ratio of ([sigma]A/[sigma]H) from the data and …
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Production of K+K - and ppbar pairs in high energy photoproduction
… for previously reported possible states in ppbar electroproduction, which are significantly below the reported cross sections.
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Inclusive pion production at large and small transverse momentum in a model of hadrons
… field theoretic ideas, the relationship with electroproduction, factorization of off-shell behavior, a double offshell enhancing effect, and experimental input. The model is calculated using numerical techniques. The main results are: 1) the model gives a good quantitative description of the …
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Lowest Q² measurement of the [gamma] *p [right arrow] [Delta] reaction : probing the pionic contribution
… = 0.060 (GeV/c)2, the lowest Q2 to date for pion electroproduction, utilizing out-of-plane magnetic spectrometers at the Mainz Microtron in Germany.
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Measurement of the D*+- cross-section at HERMES
… Delta M method. The total cross-section for the electroproduction of D^{*+/-} mesons on a proton target has been measured in a fixed target experiment with a lepton beam energy of 27.5 GeV. The analysis is based on data collected by HERMES in 1997. From this result, the open charm photoproduction …
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Virtual Compton Scattering Processes in Quantum Chromodynamics
… Compton scattering and hard exclusive meson electroproduction processes require a generalization of usual Parton distributions for the case when long-distance information is accumulated in nonforward matrix elements [special characters omitted] of quark and gluon light-cone operators. We …
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Measurement of Virtual Compton Scattering Below Pion Threshold at Invariant Four-Momentum Transfer Squared Q²=1.(GEV/C)²
… + <em>p</em> → <em>e</em> + <em>p</em> + γ of electroproduction of photons off a cryogenic liquid Hydrogen target. Data were collected in Hall A at Jefferson Lab between March and April 1998 below pion threshold at Q<sup>2</sup> = 1. and 1.9 (GeV/c)<sup>2</sup> and also in the resonance region. …
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