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High Precision Measurement Of The Proton Elastic Form Factor Ratio Mml
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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 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 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 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 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 Precision Rosenbluth Measurement of the Proton Elastic Electromagnetic Form Factors and Their Ratio at Q^2 by :
Download or read book Precision Rosenbluth Measurement of the Proton Elastic Electromagnetic Form Factors and Their Ratio at Q^2 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the inconsistency in the results of the mupGEp/GMp ratio of the proton, as extracted from the Rosenbluth and recoil polarization techniques, high precision measurements of the e-p elastic scattering cross sections were made at Q2 = 2.64, 3.20, and 4.10 GeV2. Protons were detected, in contrast to previous measurements where the scattered electrons were detected, which dramatically decreased-dependent systematic uncertainties and corrections. A single spectrometer measured the scattered protons of interest while simultaneous measurements at Q2 = 0.5 GeV2 were carried out using another spectrometer which served as a luminosity monitor in order to remove any uncertainties due to beam charge and target density fluctuations. The absolute uncertainty in the measured cross sections is (almost equal to)3% for both spectrometers and with relative uncertainties, random and slope, below 1% for the higher Q2 protons, and below 1% random and 6% slope for the monitor spectrometer. The extracted electric and magnetic form factors were determined to 4%-7% for GEp and 1.5% for GMp. The ratio mupGEp/GMp was determined to 4%-7% and showed mupGEp/GMp (almost equal to) 1.0. The results of this work are in agreement with the previous Rosenbluth data and inconsistent with high-Q2 recoil polarization results, implying a systematic difference between the two techniques.
Book Synopsis Precision Rosenbluth Measurement of the Proton Elastic Electromagnetic Form Factors and Their Ratio at Q2 by :
Download or read book Precision Rosenbluth Measurement of the Proton Elastic Electromagnetic Form Factors and Their Ratio at Q2 written by and published by . This book was released on 2005 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the inconsistency in the results of the mupGEp/GMp ratio of the proton, as extracted from the Rosenbluth and recoil polarization techniques, high precision measurements of the e-p elastic scattering cross sections were made at Q2 = 2.64, 3.20, and 4.10 GeV2. Protons were detected, in contrast to previous measurements where the scattered electrons were detected, which dramatically decreased-dependent systematic uncertainties and corrections. A single spectrometer measured the scattered protons of interest while simultaneous measurements at Q2 = 0.5 GeV2 were carried out using another spectrometer which served as a luminosity monitor in order to remove any uncertainties due to beam charge and target density fluctuations. The absolute uncertainty in the measured cross sections is 3̃% for both spectrometers and with relative uncertainties, random and slope, below 1% for the higher Q2 protons, and below 1% random and 6% slope for the monitor spectrometer. The extracted electric and magnetic form factors were determined to 4%-7% for GEp and 1.5% for GMp. The ratio mupGEp/GMp was determined to 4%-7% and showed mupGEp/GMp ̃1.0. The results of this work are in agreement with the previous Rosenbluth data and inconsistent with high-Q2 recoil polarization results, implying a systematic difference between the two techniques.
Book Synopsis Precision Measurement of the Proton Electric to Magnetic Form Factor Ratio with BLAST by : Christopher Blair Crawford
Download or read book Precision Measurement of the Proton Electric to Magnetic Form Factor Ratio with BLAST written by Christopher Blair Crawford and published by . This book was released on 2005 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured ... in the South Hall Ring of the MIT-Bates Linear Accelerator Facility. This experiment used a polarized electron beam, a pure hydrogen internal polarized target, and the symmetric Bates Large Acceptance Spectrometer Toroid (BLAST) detector. By measuring the spin-dependent elastic ... asymmetry in both sectors simultaneously, we could extract the form factor ratio independent of beam and target polarization. This was the first experiment to measure ... using a polarized target, which is complementary to recoil polarimetry experiments.
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 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proton elastic electric and magnetic form factors, G[sub E[sub p]](Q[sup 2]) and G[sub M[sub p]](Q[sup 2]), have been separated out to Q[sup 2] of 8.83 (GeV/c)[sup 2], more than doubling the Q[sup 2] range of previous data. The results for G[sub M[sub p]](Q[sup 2])/[micro][sub p]G[sub D](Q[sup 2]) decrease smoothly from 1.05 to 0.92, while G[sub E[sub p]](Q[sup 2])/G[sub D](Q[sup 2]) 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 Q[sup 2]F[sub 2]/F[sub 1] approaches a constant value for Q[sup 2]> 3 (GeV/c)[sup 2].
Book Synopsis A Precise Measurement of the Proton Elastic Form Factors for 1.75 by : Lisa Clogher
Download or read book A Precise Measurement of the Proton Elastic Form Factors for 1.75 written by Lisa Clogher and published by . This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Rosenbluth Measurement of the Proton Elastic Electromagnetic Form Factors and Their Ratio at Q^2 by :
Download or read book Precision Rosenbluth Measurement of the Proton Elastic Electromagnetic Form Factors and Their Ratio at Q^2 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the inconsistency in the results of the mupGEp/GMp ratio of the proton, as extracted from the Rosenbluth and recoil polarization techniques, high precision measurements of the e-p elastic scattering cross sections were made at Q2 = 2.64, 3.20, and 4.10 GeV2. Protons were detected, in contrast to previous measurements where the scattered electrons were detected, which dramatically decreased-dependent systematic uncertainties and corrections. A single spectrometer measured the scattered protons of interest while simultaneous measurements at Q2 = 0.5 GeV2 were carried out using another spectrometer which served as a luminosity monitor in order to remove any uncertainties due to beam charge and target density fluctuations. The absolute uncertainty in the measured cross sections is (almost equal to)3% for both spectrometers and with relative uncertainties, random and slope, below 1% for the higher Q2 protons, and below 1% random and 6% slope for the monitor spectrometer. The extracted electric and magnetic form factors were determined to 4%-7% for GEp and 1.5% for GMp. The ratio mupGEp/GMp was determined to 4%-7% and showed mupGEp/GMp (almost equal to) 1.0. The results of this work are in agreement with the previous Rosenbluth data and inconsistent with high-Q2 recoil polarization results, implying a systematic difference between the two techniques.
Book Synopsis Precision Measurement of the Proton Magnetic Form Factor at High Q2 by : Thir Gautam (Narayan, Sharma)
Download or read book Precision Measurement of the Proton Magnetic Form Factor at High Q2 written by Thir Gautam (Narayan, Sharma) and published by . This book was released on 2017 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Precision Rosenbluth Measurement of the Proton Elastic Form Factors by :
Download or read book Precision Rosenbluth Measurement of the Proton Elastic Form Factors written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the results of a new Rosenbluth measurement of the proton form factors at Q2 values of 2.64, 3.20 and 4.10 GeV2. Cross sections were determined by detecting the recoiling proton in contrast to previous measurements in which the scattered electron was detected. At each Q2, relative cross sections were determined to better than 1%. The measurement focused on the extraction of G{sub E}/G{sub M} which was determined to 4-8% and found to approximate form factor scaling, i.e. [mu]{sub p}G{sub E} ≈ G{sub M}. These results are consistent with and much more precise than previous Rosenbluth extractions. However, they are inconsistent with recent polarization transfer measurements of comparable precision, implying a systematic difference between the two techniques.
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 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 A Measurement of the Proton Elastic Form Factors for 1 ≤ Q^2 ≤ 3 (GeV/c)^2 by : Robert Christian David Walker
Download or read book A Measurement of the Proton Elastic Form Factors for 1 ≤ Q^2 ≤ 3 (GeV/c)^2 written by Robert Christian David Walker and published by . This book was released on 1989 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report measurements of the proton form factors, G^p_E and G^p_M, extracted from elastic electron scattering in the range 1 ≤ Q^2 ≤ 3 (GeV/c)^2 with uncertainties of
