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Proton Elastic Form Factor Ratio
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Book Synopsis Proton Elastic Form Factor Ratio by : Charles Perdrisat
Download or read book Proton Elastic Form Factor Ratio written by Charles Perdrisat and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The ratio of the electric and magnetic proton form factors, G{sub Ep}/G{sub Mp}, has been obtained in two Hall A experiments, from measurements of the longitudinal and transverse polarization of the recoil proton, P{sub l} and P{sub t}, respectively, in the elastic scattering of polarized electrons, {rvec e}p {yields} e{rvec p}. Together these experiments cover the Q{sup 2}-range 0.5 to 5.6 GeV{sup 2}. A new experiment is currently being prepared, to extend the Q{sup 2}-range to 9 GeV{sup 2} in Hall C.
Book Synopsis Precision Measurements of the Proton Elastic Form Factor Ratio by :
Download or read book Precision Measurements of the Proton Elastic Form Factor Ratio written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: New high precision polarization measurements of the proton elastic form factor ratio in the Q^2 from 0.3 to 0.7 [GeV/c]^2 have been made. These elastic H(e, e'p) measurementswere done in Jefferson Lab's Hall A using 80% longitudinally polarized electrons and recoil polarimetry. For Q^2 greater than 1 [GeV/c]^2, previous polarization data indicated a strong deviation of the form factor ratio from unity which sparked renewed theoretical and experimental interest in how two-photon diagrams have been taken into account. The new high precision data indicate that the deviation from unity, while small, persists even at Q^2 less than 1 [GeV/c]^2.
Book Synopsis The Proton Form Factor Ratio Measurements at Jefferson Lab by :
Download or read book The Proton Form Factor Ratio Measurements at Jefferson Lab written by and published by . This book was released on 2014 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ratio of the proton form factors, G{sub Ep}/G{sub Mp}, has been measured from Q2 of 0.5 GeV2 to 8.5 GeV2, at the Jefferson Laboratory, using the polarization transfer method. This ratio is extracted directly from the measured ratio of the transverse and longitudinal polarization components of the recoiling proton in elastic electron-proton scattering. The discovery that the proton form factor ratio measured in these experiments decreases approximately linearly with four-momentum transfer, Q2, for values above ~1 GeV2, is one of the most significant results to come out of JLab. These results have had a large impact on progress in hadronic physics; and have required a significant rethinking of nucleon structure. The increasingly common use of the double-polarization technique to measure the nucleon form factors, in the last 15 years, has resulted in a dramatic improvement of the quality of all four nucleon electromagnetic form factors, G{sub Ep}, G{sub Mp}, G{sub En} and G{sub Mn}. There is an approved experiment at JLab, GEP(V), to continue the ratio measurements to 12 GeV2. A dedicated experimental setup, the Super Bigbite Spectrometer (SBS), will be built for this purpose. It will be equipped with a focal plane polarimeter to measure the polarization of the recoil protons. The scattered electrons will be detected in an electromagnetic calorimeter. In this presentation, I will review the status of the proton elastic electromagnetic form factors and discuss a number of theoretical approaches to describe nucleon form factors.
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 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 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 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 [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 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 Measurements of the Proton Electromagnetic Form Factor Ratio From Elastic E + P -] E + P Scattering at Momentum Transfer Q2 by :
Download or read book Measurements of the Proton Electromagnetic Form Factor Ratio From Elastic E + P -] E + P Scattering at Momentum Transfer Q2 written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics of the nucleon's quark constituents. Electromagnetic probes are traditionally preferered to the hadronic beams. The electromagnetic interaction is a powerful tool for investigating the nucleon structure since it is well understood and it reveals observables that can be directly interpreted in terms of the current carried by the quarks. Elastic scattering leads to the form factors that describe the spatial charge and current distributions inside the nucleon. The reaction mechanism is assumed to be one photon exchange, the electromagnetic interaction is exactly calculable in QED, and one can safely extract the information on the hadronic vertex. The most important feature of early measurements of proton form factor ratio GEp/GMp with recoil polarization technique at Q2 up to 5.6 (GeV/c)2 is the sharp decline of the ratio with Q2 increases, indicating that GEp falls much faster than GMp. This contradicts to data obtained by Rosenbluth separation method. An intriguing question was whether GEp will continue to decrease or become constant when Q2 increases. New set of measurements of proton form factor ratio GEp/GMp at Q2 = 2.5, 5.2, 6.7 and 8.5 (GeV/c)2 have been conducted at JLab Hall C using ~85% longitudinally polarized electron elastic scattering from unpolarized hydrogen target. Recoil protons were detected in the HMS magnetic spectrometer with the standard detector package, combined with newly installed trigger scintillators and Focal Plane Polarimeter. The BigCal electromagnetic calorimeter (1744 channel) have been used for electron detection. Data obtained in this experiment show that GEp/GMp ratio continued to drop with Q2 and may cross 'zero' at Q2> 10-15 (GeV/c)2. Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton form factor ratio GEp/GMp obtained from cross section and polarization measurements. It was assumed that the two photon exchange contribution might be responsible for difference of GEp/GMp ratio obtained by Rosenbluth separation method and recoil polarization technique. The kinematical dependence of polarization transfer observables in elastic electron-proton scattering at Q2 = 2.5 (GeV/c)2 have been used in search of effects of 2[gamma] contribution. For a wide range of values of the virtual photon polarization [Sigma] ([Sigma] = 0.15, 0.63, and 0.77), the proton form factor ratio and longitudinal polarization transfer component were measured with statistical uncertainties of ±0.01 and ±0.005, respectively. Our data provide significant constraints on models of nucleon structure.
Book Synopsis Proton Form Factor Ratio Measurement with BLAST by : Adrian Tiberiu Sindile
Download or read book Proton Form Factor Ratio Measurement with BLAST written by Adrian Tiberiu Sindile and published by . This book was released on 2006 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Structure in the Proton Form Factor Ratio at Low Q2 by :
Download or read book Structure in the Proton Form Factor Ratio at Low Q2 written by and published by . This book was released on 2007 with total page 82001 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 A Precise Measurement of the Proton Elastic Form Factors for 1.75 [ by :
Download or read book A Precise Measurement of the Proton Elastic Form Factors for 1.75 [ written by and published by . This book was released on 2004 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proton elastic electric and magnetic form factors, G{sub E{sub p}}(Q2) and G{sub M{sub p}}(Q2), have been separated out to Q2 of 8.83 (GeV/c)2, more than doubling the Q2 range of previous data. The results for G{sub M{sub p}}(Q2)/[mu]{sub p}G{sub D}(Q2) decrease smoothly from 1.05 to 0.92, while G{sub E{sub p}}(Q2)/G{sub D}(Q2) is consistent with unity. Comparisons are made to QCD Sum Rule, diquark, constituent quark, and VMD models, none of which agree with all of the new data. The ratio Q2F2/F1 approaches a constant value for Q2> 3 (GeV/c)2.
Book Synopsis An Investigation of the Influence of Scaling Laws on the Ratio of Neutron-Proton Charge Form Factor Calculations by : Joseph Homer Brooks
Download or read book An Investigation of the Influence of Scaling Laws on the Ratio of Neutron-Proton Charge Form Factor Calculations written by Joseph Homer Brooks and published by . This book was released on 1971 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of conventional and broken-symmetry scaling, and their effect on the ratio of the neutron-proton electric form factors, G sub En/G sub Ep, was carried out using measurements from elastic electron-deuteron and electron-proton scattering in the range of momentum transfers, q squared, of 0.10
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