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Showing 1 to 20 of 22 for “"Electron-proton scattering"”.
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Measuring the lepton sign asymmetry in elastic electron-proton scattering with OLYMPUS
… Germany, on the asymmetry between positron-proton and electron-proton elastic scattering cross sections. A non-zero asymmetry is evidence of hard two-photon exchange, which has been hypothesized to cause the discrepancy in measurements of the proton's electromagnetic form factors. …
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Measurement of the Strange Quark Contribution to Proton Structure Through Parity Violating Electron -Proton Scattering
At intermediate Q2 of about 0.23 ( GeV/c)2, a consistent value of is seen compared to previous experiments; together with a measurement that may imply a negative value of GsE . For Q2 above 0.5 (GeV/c) 2 a consistently positive value for the linear combination of the strange form factors is seen.
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Measurement of the strange quark contribution to proton structure through parity violating electron-proton scattering
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-26T21:09:27Z No. of bitstreams: 1 Nakahara_Kazutaka.pdf: 6364023 bytes, checksum: 95e2dbf91d0ddd898fcd27bbef85e892 (MD5)
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New techniques in low-Q² elastic electron-proton scattering measurements and the proton radius extraction
The proton charge radius is a fundamental property of the proton, sensitive to its charge distribution. The proton radius puzzle is the discrepancy between the muonic hydrogen spectroscopy measurement of 0.84 fm and the consensus of 0.88 fm from two traditional methods, electron-proton scattering …
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A measurement of the two-photon exchange effect in elastic electron-proton scattering with OLYMPUS
Elastic electron-proton scattering has long been the tool of choice for the study of the proton form factors, GE(Q 2 ) and GM(Q2 ), which describe the electric and magnetic distributions of the proton as a function of momentum transfer. Recent experiments, measuring the form factors from …
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Forward jet production in neutral current deep inelastic scattering with ZEUS at HERA
… collider at DESY (Hamburg) <br>deep inelastic electron-proton scattering can be investigated at a centre-of-mass energy of 318 GeV. Forward jets as a certain class of neutral current events are selected to probe different parton evolution models. The measured cross sections depending on …
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Symbolic computation of electron-proton to slepton-squark scattering cross sections based on a left-right supersymmetric extension of the standard model
… exchange of neutralinos and charginos in electron-proton scattering is analyzed. The symbolic programming language Mathematica ® , is used to develop a program to generate a symbolic representation of the invariant amplitude for these processes. Differential cross sections, based on …
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Multiperipheral models in high energy scattering
… of the multiperipheral model to inelastic electron-proton scattering. The form factor vW2 for this process is numerically evaluated in a multiperipheral model with scalar couplings, and in a generalization of this model which allows form factors to accompany. the pion exchange. It is found …
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Test of New Readout Electronics for the BONuS12 Experiment
<p>For decades, electron-proton scattering experiments have been providing a large amount of data on the proton structure function. However, because of the instability of free neutrons, fewer experiments have been able to study the neutron structure function. The BONuS collaboration at Jefferson …
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Nucleon structure and Its modification in nuclei
Inclusive electron scattering experiments using fixed targets are an important tool for studying the structure of the nucleons. The electromagnetic structure of the proton, as encapsulated by its elastic form factors, can be extracted through measurements of the elastic electron-proton scattering …
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Deeply Virtual Compton Scattering at Hall A, Jefferson Lab
… of a quark-gluon system. Deeply Virtual Compton Scattering (DVCS) is understood to be the simplest and cleanest process to access GPDs. Even though the exclusive DVCS is simple to understand, the experimental process however, is complex with the Bethe-Heitler and Associated DVCS being in the mix …
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The contribution of two-photon exchange in elastic lepton-proton scattering
… of the electric-to-magnetic ratio of the proton's elastic form factors, GE/GM, have recently been shown to diverge at high momentum transfer, Q2, based on which of two experimental methods is employed. Reanalysis of all results might be able to bring them into agreement if some previously …
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Measurement of the Deeply Virtual Compton Scattering Cross Section from the Proton at 10.6 GeV using the CLAS12 Detector
Deeply Virtual Compton Scattering (DVCS) is an exclusive process that produces a real photon when a lepton scatters from a quark inside a nucleon or a nucleus. Measurement of the DVCS cross section enables the study of the Generalized Parton Distributions (GPD), which plays a central role in …
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Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering
… has precisely determined the weak charge of the proton Qp w by measuring the parity-violating asymmetry in elastic electron-proton scattering at a low momentum transfer of Q2 = 0.0249 (GeV/c)2 . Qpw has a definite prediction in the Standard Model, and a value of sin2 θW can be extracted from it …
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A precision measurement of the e⁺p/e⁻p elastic scattering cross section ratio at the OLYMPUS experiment
Measurements of the ratio of the proton elastic form factors ([mu]pGe/Gm) using Rosenbluth separation and those using polarization-based techniques show a strong discrepancy, which has persisted both in modern experimental results and in re-analyses of previous data. The most widely accepted …
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Measuring the Weak Charge of the Proton and the Hadronic Parity Violation of the N →Δ Transition
Qweak will determine the weak charge of the proton, QpW, via an asymmetry measurement of parity-violating elastic electron-proton scattering at low four momentum transfer to a precision of 4%. QpW has firm Standard Model prediction and is related to the weak mixing angle, sin20W, a well-defined …
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Precision measurement of the weak charge of the proton and parity violation in the N → ∆ transition
… weak analog to the electric charge of the proton. Qweak measured the parity-violating asymmetry in elastic electron-proton scattering at an extreme forward angle (Q² = 0.0249 (GeV/c)² ). From the data gathered via the 1.16 GeV 180 μA longitudinally polarized electron beam scattering off the …
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Parity-Violating Elastic Electron Nucleon Scattering: Measurement of the Strange Quark Content of the Nucleon and Towards a Measurement of the Weak Charge of the Proton
… this thesis exploit parity violation in elastic electron proton scattering in order to measure properties of the nucleon. Both experiments make use of the high quality, highly polarized electron beam available at Thomas Jefferson National Accelerator Facility. Q<sub>weak</sub> will measure the …
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Deep inelastic scattering at high energies
… observables, the process of deep inelastic scattering. We begin by recounting three landmark experiments which lead to crucial breakthroughs in our understanding of the nucleus’s’ structure. We first describe the Geiger-Marsden experiment which provided the first evidence for the existence …
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