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Measurement Of The Strange Quark Contribution To The Vector Structure Of The Proton
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Book Synopsis Measurement of the Strange Quark Contribution to the Vector Structure of the Proton by : Sarah Katherine Phillips
Download or read book Measurement of the Strange Quark Contribution to the Vector Structure of the Proton written by Sarah Katherine Phillips and published by . This book was released on 2009 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Strange Quark Contribution to the Vector Structure of the Proton by :
Download or read book Measurement of the Strange Quark Contribution to the Vector Structure of the Proton written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the G0 experiment is to determine the contribution of the strange quarks in the quark-antiquark sea to the structure of the nucleon. To this end, the experiment measured parityviolating asymmetries from elastic electron-proton scattering from 0.12 ≤ Q2 ≤ 1.0 (GeV/c)2 at Thomas Jefferson National Accelerator Facility. These asymmetries come from the interference of the electromagnetic and neutral weak interactions, and are sensitive to the strange quark contributions in the proton. The results from the forward-angle measurement, the linear combination of the strange electric and magnetic form factors GsE +[eta]GsM, suggest possible non-zero, Q2 dependent, strange quark contributions and provide new information to understand the magnitude of the contributions. This dissertation presents the analysis and results of the forward-angle measurement. In addition, the G0 experiment measured the beam-normal single-spin asymmetry in the elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q2 = 0.15, 0.25 (GeV/c)2 as part of the forward-angle measurement. The transverse asymmetry provides a direct probe of the imaginary component of the two-photon exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments. The results of the measurement indicate that calculations using solely the elastic nucleon intermediate state are insufficient and generally agree with calculations that include significant inelastic hadronic intermediate state contributions. This dissertation presents the analysis and results of this measurement.
Book Synopsis Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-Violating Electron Scattering by :
Download or read book Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-Violating Electron Scattering written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 backward angle experiment, completed in Hall C of the Thomas Jefferson National Accelerator Facility (TJNAF), measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q2 = 0.22 and 0.63 (GeV/c)2. The asymmetries are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of lte 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. This was also the first measurement of the anapole moment effects in the axial-vector current at these four-momentum transfers.
Book Synopsis Measurement of the Strange Quark Contribution to Proton Structure Through Parity Violating Electron-Proton Scattering by : Kazutaka Nakahara
Download or read book Measurement of the Strange Quark Contribution to Proton Structure Through Parity Violating Electron-Proton Scattering written by Kazutaka Nakahara and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 (G-Zero) forward angle experiment completed in Hall C of the Thomas Jefferson National Accelerator Facility (TJNAF) has measured the parity violating asymmetries in elastic electron-proton scattering over a Q2 range of 0.12
Book Synopsis The Spin Structure of the Proton by : Steven D. Bass
Download or read book The Spin Structure of the Proton written by Steven D. Bass and published by World Scientific. This book was released on 2008 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the main challenges in nuclear and particle physics in the last 20 years has been to understand how the proton's spin is built up from its quark and gluon constituents. Quark models generally predict that about 60% of the proton's spin should be carried by the spin of the quarks inside, whereas high energy scattering experiments have shown that the quark spin contribution is small - only about 30%. This result has been the underlying motivation for about 1000 theoretical papers and a global program of dedicated spin experiments at BNL, CERN, DESY and Jefferson Laboratory to map the individual quark and gluon angular momentum contributions to the proton's spin, which are now yielding exciting results. This book gives an overview of the present status of the field: what is new in the data and what can be expected in the next few years. The emphasis is on the main physical ideas and the interpretation of spin data. The interface between QCD spin physics and the famous axial U(1) problem of QCD (eta and etaprime meson physics) is also highlighted. Book jacket.
Book Synopsis Measurement of the Strange Quark Contribution to the Magnetic Moment of the Proton by : Bryon Alan Mueller
Download or read book Measurement of the Strange Quark Contribution to the Magnetic Moment of the Proton written by Bryon Alan Mueller and published by . This book was released on 1997 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-violating Electron Scattering by : Colleen L. Ellis
Download or read book Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-violating Electron Scattering written by Colleen L. Ellis and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Strange Quark Contribution to the Proton Spin Using Neutral Kaons at HERMES by : Shaojun Lu
Download or read book Measurement of the Strange Quark Contribution to the Proton Spin Using Neutral Kaons at HERMES written by Shaojun Lu and published by . This book was released on 2007 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis From Parity Violation to Hadronic Structure and more by : K. de Jager
Download or read book From Parity Violation to Hadronic Structure and more written by K. de Jager and published by Springer Science & Business Media. This book was released on 2008-06-21 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the third international workshop on From Parity Violation to Hadronic Structure and More. The many applications of parity violation are way beyond the scope of what Lee and Yang could have imagined fifty years after their proposal. For the physics topics discussed during this workshop, the application of parity violation has become a standard work horse allowing for the extraction of many physics topics in different experiments.
Book Synopsis The Spin Structure of the Proton and Polarized Collider Physics by : Steven D. Bass
Download or read book The Spin Structure of the Proton and Polarized Collider Physics written by Steven D. Bass and published by . This book was released on 2002 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Associated Production of W + Charm in 13 TeV Proton-Proton Collisions Measured with CMS and Determination of the Strange Quark Content of the Proton by : Svenja Karen Pflitsch
Download or read book Associated Production of W + Charm in 13 TeV Proton-Proton Collisions Measured with CMS and Determination of the Strange Quark Content of the Proton written by Svenja Karen Pflitsch and published by Springer Nature. This book was released on 2020-08-18 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The associated production of a W boson and a single charm quark (W+c) is the only process in proton-proton collisions that directly probes the strange quark content of the proton. In this thesis, W+charm production is measured in proton-proton collisions at the LHC at 13 TeV, as recorded by the Compact Muon Solenoid (CMS) experiment. The analysis focuses on the identification of W bosons in their leptonic decay to a muon and a neutrino and charm quarks are tagged via the full reconstruction of D*-Mesons. The measured cross sections of W+c production are used, in combination with other relevant CMS results and the most precise HERA DIS data, in a QCD analysis to determine the strange quark content of the proton. The resulting strange quark distribution and suppression, with respect to the other light sea quarks, are in good agreement with those obtained in neutrino scattering experiments and extend their kinematic reach.
Book Synopsis Strange Quark Contribution to the Proton Spin, from Elastic $\vecep$ and $\nu P$ Scattering by : Stephen Pate
Download or read book Strange Quark Contribution to the Proton Spin, from Elastic $\vecep$ and $\nu P$ Scattering written by Stephen Pate and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The strangeness contribution to the vector and axial form factors of the proton is presented for momentum transfers in the range 0.45
Book Synopsis Hadron Structure in Electroweak Precision Measurements by : Nathan L. Hall
Download or read book Hadron Structure in Electroweak Precision Measurements written by Nathan L. Hall and published by Springer. This book was released on 2015-07-24 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines the γZ box contribution to the weak charge of the proton. Here, by combining recent parity-violating electron-deuteron scattering data with our current understanding of parton distribution functions, the author shows that one can limit this model dependence. The resulting construction is a robust model of the γγ and γZ structure functions that can also be used to study a variety of low-energy phenomena. Two such cases are discussed in this work, namely, the nucleon’s electromagnetic polarizabilities and quark-hadron duality. By using phenomenological information to constrain the input structure functions, this important but previously poorly understood radiative correction is determined at the kinematics of the parity-violating experiment, QWEAK, to a degree of precision more than twice that of the previous best estimate. A detailed investigation into available parametrizations of the electromagnetic and interference cross-sections indicates that earlier analyses suffered from the inability to correctly quantify their model dependence.
Book Synopsis Strange Quarks In Hadrons, Nuclei And Nuclear Matter - Proceedings Of The International Workshop by : Kenneth H Hicks
Download or read book Strange Quarks In Hadrons, Nuclei And Nuclear Matter - Proceedings Of The International Workshop written by Kenneth H Hicks and published by World Scientific. This book was released on 2001-02-28 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume brings together the contributions of experts from different fields within the nuclear physics community. Topics such as rare kaon decays, astrophysics, relativistic heavy ion collisions, and few-GeV electromagnetic probes are covered. The strange quark plays a vital role in understanding such diverse phenomena as CP violation (article by Lincoln Wolfenstein), the “spin crisis” (article by Brad Filipone), and supernova explosions (article by Chris Fryer). Additional topics of interest are parity violation experiments, strangeness content of the proton, and enhanced strangeness production at CERN and RHIC. This unique blend of recent results, with a focus on the role of the strange quark, shows the prominence of strangeness in nuclear physics over the past 50 years.
Book Synopsis Perspectives In Nuclear Physics At Intermediate Energy - Proceedings Of The 6th Workshop by : Sigfrido Boffi
Download or read book Perspectives In Nuclear Physics At Intermediate Energy - Proceedings Of The 6th Workshop written by Sigfrido Boffi and published by World Scientific. This book was released on 1995-02-22 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of new and relevant experimental results are here presented to the community for the first time. In particular, we refer to the measurement of the neutron spin structure functions by the SLAC (E142) and CERN (SMC) collaborations; the first results from MAMI on experiments with tagged photons (A1 collaboration), on electroproduction of multi-hadron final states (A2 collaboration) and the neutron form factor (A3 collaboration); the experiments on strangeness photoproduction at ELSA; the polarization experiments at Bates on the neutron form factor and nuclear response functions and the photon and electron scattering data obtained by the Genova-Frascati Jet Target collaboration.Focused on the study of spin observables and exclusive processes at high momenta, the following sessions were held: The Neutron Form Factors; Spin Structure Functions; Exclusive Processes at High υ and Q2. Deep Inelastic Scattering; Spin Observables; One- and Two-Nucleon Knockout at Low and Intermediate Energies; Excitation of Baryons Resonances and Strangeness.
Book Synopsis Measurement of the Polarization of Strange Quark in the Nucleon and Determination of Quark Fragmentation Functions Into Hadrons by : Nour Makke
Download or read book Measurement of the Polarization of Strange Quark in the Nucleon and Determination of Quark Fragmentation Functions Into Hadrons written by Nour Makke and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the nucleon structure is currently one of the main challenges encountered in nuclear physics. The present work represents a contribution to the study of the nucleon structure and deals, in particular, with the study of the role of strange quarks in the nucleon. The latter can be investigated by determing the strange quark distribution in the nucleon as well as the contribution of the spins of strange quarks to the nucleon spin (∆s). This work first presents a measurement of ∆s performed via Deeply Inelastic Scattering of a muon beam off polarized proton and deuterium targets. The result is found to be strongly dependent on the quark fragmentation functions into hadrons (FFs), which define the probability that a quark of a given flavour fragments into a final state hadron. The FFs are poorly known, in particular, the FF of strange quark into kaons, which play an important role in the determination of ∆s. In deep inelastic scattering process, the access to the FFs is provided by the hadron multiplicities which, in turn, define the average number of hadrons produced per DIS event. Pion and kaon multiplicities have been extracted versus different kinematic variables, using DIS data collected by deeply inelastic scattering of a 160 GeV muons off a deuterium target. A first LO extraction of the fragmentation functions has then been performed using the measured pion and kaon multiplicities.
Book Synopsis New Precision Limit on the Strange Vector Form Factors of the Proton by :
Download or read book New Precision Limit on the Strange Vector Form Factors of the Proton written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV2 and beam energy Eb = 3.48 GeV to be APV = -23.80 " 0.78 (stat) " 0.36 (syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors GEs + 0.517 GMs = 0.003 " 0.010 (stat) " 0.004 (syst) " 0.009 (ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors.
