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The Proton Elastic Form Factor Ratio Mup Gpe Gpm At Low Momentum Transfer
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Book Synopsis The Proton Elastic Form Factor Ratio Mu(p) G**p(E)/G**p(M) at Low Momentum Transfer by :
Download or read book The Proton Elastic Form Factor Ratio Mu(p) G**p(E)/G**p(M) at Low Momentum Transfer written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High precision measurements of the proton elastic form factor ratio have been made at four-momentum transfers, Q^2, between 0.2 and 0.5 GeV^2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q^2 range the deviation from unity is primarily due to GEp being smaller than the dipole parameterization.
Book Synopsis The Proton Elastic Form Factor Ratio [mu]pGpe/Gpm at Low Q2 by : Guy Ron
Download or read book The Proton Elastic Form Factor Ratio [mu]pGpe/Gpm at Low Q2 written by Guy Ron and published by . This book was released on 2008 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proton Form Factor Ratio, [mu]pGEP/GMP from Double Spin Asymmetry by :
Download or read book Proton Form Factor Ratio, [mu]pGEP/GMP from Double Spin Asymmetry written by and published by . This book was released on 2013 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The form factors are fundamental properties of the nucleon representing the effect of its structure on its response to electromagnetic probes such as electrons. They are functions of the four-momentum transfer squared Q2 between the electron and the proton. This thesis reports the results of a new measurement of the ratio of the electric and magnetic form factors of the proton up to Q2 = 5.66 (GeV/c)2 using the double spin asymmetry with a polarized beam and target. Experiment E07-003 (SANE, Spin Asymmetries of the Nucleon Experiment) was carried out in Hall C at Jefferson Lab in 2009 to study the proton spin structure functions with a dynamically polarized ammonia target and longitudinally polarized electron beam. By detecting elastically scattered protons in the High-Momentum Spectrometer (HMS) in coincidence with the electrons in the Big Electron Telescope Array (BETA), elastic measurements were carried out in parallel. The elastic double spin asymmetry allows one to extract the proton electric to magnetic form factor ratio GpE/GpM at high-momentum transfer, Q2= 5.66 (GeV/c)2. In addition to the coincidence data, inclusively scattered electrons from the polarized ammonia target were detected by HMS, which allows to measure the beam-target asymmetry in the elastic region with the target spin nearly perpendicular to the momentum transfer, and to extract GpE/GpM at low Q2= 2.06 (GeV/c)2. This alternative measurement of GpE/GpM has verified and confirmed the dramatic discrepancy at high Q2 between the Rosenbluth and the recoil-polarization-transfer iv method with a different measurement technique and systematic uncertainties uncorrelated to those of the recoil-polarization measurements. The measurement of the form factor ratio at Q2 = 2.06 (GeV/c)2 has been determined as [mu]{sub p}GpE/GpM = 0.605±0.178stat±0.033sys which is in agreement with an earlier measurement with the polarized target technique at similar kinematics. The measurement of the form factor ratio at Q2 = 5.66 (GeV/c)2 has been determined as [mu]pGpE/GpM = 0.672 ± 0.362stat which represents the highest Q2 reach with the double spin asymmetry to date.
Book Synopsis Proton Elastic Form Factor Ratios to Q2 by :
Download or read book Proton Elastic Form Factor Ratios to Q2 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The ratio of the proton elastic electromagnetic form factors, G{sub E{sub p}}/G{sub M{sub p}}, was obtained by measuring P{sub t} and P{sub {ell}}, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic {rvec e}p --> e{rvec p} reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV2. In the single-photon exchange approximation, the ratio G{sub E{sub p}}/G{sub M{sub p}} is directly proportional to the ratio P{sub t}/P{sub {ell}}. The simultaneous measurement of P{sub t} and P{sub {ell}} in a polarimeter reduces systematic uncertainties. The results for the ratio G{sub E{sub p}}/G{sub M{sub p}} show a systematic decrease with increasing Q2, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been re-analyzed and systematic uncertainties have become significantly smaller than previously published results.
Book Synopsis High-precision Measurement of the Proton Elastic Form Factor Ratio [mml by :
Download or read book High-precision Measurement of the Proton Elastic Form Factor Ratio [mml written by and published by . This book was released on 2011 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, we report a new high precision measurement of the proton elastic form factor ratio [mu]pGE/GM for the four-momentum transfer squared Q2 = 0.3-0.7 (GeV/c)2. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With the achieved ~1% total uncertainty, the new data clearly show that the deviation of the ratio [mu]pGE/GM from unity observed in previous polarization measurements at high Q2 continues down to the lowest Q2 value of this measurement. The updated global fit that includes the new results yields in this Q2 range an electric (magnetic) form factor ~2% smaller (~1% larger) than the previous global fit. We obtain new extractions of the proton electric and magnetic radii, which are (rE2)1/2 = 0.875 ± 0.010 fm and (rM2)1/2 = 0.867 ± 0.020 fm. Moreover, the charge radius is consistent with other recent extractions based on the electron-proton interaction, including the atomic hydrogen Lamb shift measruements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift.
Book Synopsis Precision Measurement of ?GpE/Gpm at Low Q 2 by :
Download or read book Precision Measurement of ?GpE/Gpm at Low Q 2 written by and published by . This book was released on 2011 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precision measurements are presented of the proton electric to magnetic form-factors ratios at Q 2 = 0.3 - 0.8 (GeV/c)2, obtained by polarization-transfer in Hall A of the Jefferson Laboratory. The measured ratios are significantly lower than published values. New global fits to the individual form factors indicate a lower electric form factor and a slightly higher magnetic form factor. The proton charge radius extracted from the new results is somewhat smaller but consistent with previous values obtained from electron–proton scattering, and is in significant disagreement with the recent value obtained from muonic hydrogen. The effects of the new results on other quantities are briefly discussed.
Book Synopsis The Charge Form Factor of the Proton at a Momentum Transfer of 75 F-2 by : Wulfrin Bartel
Download or read book The Charge Form Factor of the Proton at a Momentum Transfer of 75 F-2 written by Wulfrin Bartel and published by . This book was released on 1967 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Proton Form Factor at Low Momentum Transfer by : Robert H. Gordon
Download or read book Measurement of the Proton Form Factor at Low Momentum Transfer written by Robert H. Gordon and published by . This book was released on 1968 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron scattering experiments on the proton were carried out in a range of momentum transfers squared of 0.025 (Fermi superscript -2) to 0.65 (Fermi superscript -2). Polyethylene was used as target material and the proton data were normalized against carbon electron scattering data taken at higher momentum transfer. The relative proton data obtained in this manner do not fit the generally accepted form factor curve. Possible reasons for the deviations in view of recent suggestions about the existence of a proton halo are offered. However, it is not possible at the present stage of accuracy to make any definite statement except that the data are not inconsistent with the existence of a proton halo. (Author).
Book Synopsis Measurement of the Proton Form Factors Ratio GE/GM to Q2 by :
Download or read book Measurement of the Proton Form Factors Ratio GE/GM to Q2 written by and published by . This book was released on 2002 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we present the results of the experiment E99-007, which measured the ratio of the electric to magnetic form factors of the proton to the four momentum transfer square Q2 = 5.6 GeV2, by recoil polarimetry. Data were taken in 2000 at the Thomas Jefferson National Accelerator Facility in Virginia, USA. A 4.6 GeV polarized electron beam was scattered off a cryogenic hydrogen target. The polarization of the recoil proton was measured in the Focal Plane Polarimeter, located after one of the two High Resolution Spectrometers in the hall. The ratio of the transverse to longitudinal components of the recoil proton polarization is proportional to the ratio of the form factors. Elastic events were selected by detecting the scattered electron in a large acceptance lead-glass calorimeter. The main result of this experiment is the linear decrease of the form factor ratio with increasing Q2, corresponding to different spatial distributions of the electric charge and the magnetization. Numerous theoretical calculations show that relativistic effects, such as mixing of spin states due to Lorentz boosts, are important to account for the observed data in this critical intermediate kinematic region.
Book Synopsis High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q2 by : Xiaohui Zhan
Download or read book High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q2 written by Xiaohui Zhan and published by . This book was released on 2010 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiment E08-007 measured the proton elastic form factor ratio [mu]GE/GM in the range of Q2 = 0.3-0.7(GeV/c)2 by recoil polarimetry. Data were taken in 2008 at the Thomas Jefferson National Accelerator Facility in Virginia, USA. A 1.2 GeV polarized electron beam was scattered off a cryogenic hydrogen target. The recoil proton was detected in the left HRS in coincidence with the elastically scattered electrons tagged by the BigBite spectrometer. The proton polarization was measured by the focal plane polarimeter (FPP). In this low Q2 region, previous measurement from Jefferson Lab Hall A (LEDEX) along with various fits and calculations indicate substantial deviations of the ratio from unity. For this new measurement, the proposed statistical uncertainty (
Book Synopsis High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q2 by :
Download or read book High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q2 written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A high precision measurement of the proton elastic form factor ratio μpGEp/GMp in the range Q2 = 0.3-0.7 GeV2/c2 was performed using recoil polarimetry in Jefferson Lab Hall A. In this low Q2 range, previous data from LEDEX [5] along with many fits and calculations [2, 3, 4] indicate substantial deviations of the ratio from unity. In this new measurement, with 80% polarized electron beam for 24 days, we are able to achieve
Book Synopsis Low Momentum Transfer Proton-proton Elastic Scattering Up to 400 GeV by : Dan A. Gross
Download or read book Low Momentum Transfer Proton-proton Elastic Scattering Up to 400 GeV written by Dan A. Gross and published by . This book was released on 1974 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proton Form Factors from Elastic Electron-proton Scattering by : T. Janssens
Download or read book Proton Form Factors from Elastic Electron-proton Scattering written by T. Janssens and published by . This book was released on 1965 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Absolute measurements of the elastic electron-proton cross section have been made with a precision of about 4% for values of the square of the four-momentum transfer, q to the second power, in the range 6.0 to 30.0 F to the minus second power and for electron scattering angles in the range 45 to 145 degrees. To within the experimental errors, it is found that the charge and magnetic form factors of the proton have a common dependence on q to the second power, when normalized to unity at 1 to the second power = 0, and than an accurate representation of the form factor behavior and that of the cross sections themselves can be given in terms of a three-pole approximation to the dispersion theory of nucleon form factors. (Author).
Book Synopsis Final Analysis of Proton Form Factor Ratio Data at Q2 by :
Download or read book Final Analysis of Proton Form Factor Ratio Data at Q2 written by and published by . This book was released on with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently published measurements of the proton electromagnetic form factor ratio R = [mu]p GEp/GMp at momentum transfers Q2 up to 8.5 GeV2 in Jefferson Lab Hall C deviate from the linear trend of previous measurements in Jefferson Lab Hall A, favoring a slower rate of decrease of R with Q2. While statistically compatible in the region of overlap with Hall A, the Hall C data hint at a systematic difference between the two experiments. This possibility was investigated in a reanalysis of the Hall A data. We find that the original analysis underestimated the background in the selection of elastic events. The application of an additional cut to further suppress the background increases the results for R, improving the consistency between Halls A and C.
Book Synopsis Lineage and Bible Records Relating to Hand Families by :
Download or read book Lineage and Bible Records Relating to Hand Families written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 1000 Solved Problems in Classical Physics by : Ahmad A. Kamal
Download or read book 1000 Solved Problems in Classical Physics written by Ahmad A. Kamal and published by Springer Science & Business Media. This book was released on 2011-03-18 with total page 809 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book basically caters to the needs of undergraduates and graduates physics students in the area of classical physics, specially Classical Mechanics and Electricity and Electromagnetism. Lecturers/ Tutors may use it as a resource book. The contents of the book are based on the syllabi currently used in the undergraduate courses in USA, U.K., and other countries. The book is divided into 15 chapters, each chapter beginning with a brief but adequate summary and necessary formulas and Line diagrams followed by a variety of typical problems useful for assignments and exams. Detailed solutions are provided at the end of each chapter.
Book Synopsis Dictionary of Medical Acronyms and Abbreviations by : Stanley Jablonski
Download or read book Dictionary of Medical Acronyms and Abbreviations written by Stanley Jablonski and published by Hanley & Belfus. This book was released on 2004-09 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dictionary lists acronyms and abbreviations occurring with a reasonable frequency in the literature of medicine and the health care professions. Abbreviations and acronyms are given in capital letters, with no punctuation, and with concise definitions. The beginning sections also include symbols, genetic symbols, and the Greek alphabet and symbols.
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