Download or read book Towards a Resolution of the Proton Form Factor Problem written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a significant discrepancy between the values of the proton electric form factor, GpE, extracted using unpolarized and polarized electron scattering. Calculations predict that small two-photon exchange (TPE) contributions can significantly affect the extraction of GpE from the unpolarized electron-proton cross sections. We determined the TPE contribution by measuring the ratio of positron-proton to electron-proton elastic scattering cross sections using a simultaneous, tertiary electron-positron beam incident on a liquid hydrogen target and detecting the scattered particles in the Jefferson Lab CLAS detector. This novel technique allowed us to cover a wide range in virtual photon polarization (epsilon) and momentum transfer (Q2) simultaneously, as well as to cancel luminosity-related systematic errors. The cross section ratio increases with decreasing [epsilon] at Q2=1.45 GeV2. This measurement is consistent with the size of the form factor discrepancy at Q2≈1.75 GeV2 and with hadronic calculations including nucleon and Delta intermediate states, which have been shown to resolve the discrepancy up to 2-3 GeV2.
Download or read book Proceedings of the 2nd World Conference on Social and Humanities Research W SHARE 2022 written by Andi Anto Patak and published by Springer Nature. This book was released on 2023-07-14 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an open access book. The 2nd World Conference on Social and Humanities Research (W-SHARE) was conducted on November 20-21, 2022, in Makassar, Indonesia*. W-SHARE, the leading forum for the presentation of proposed research and research results, is organized by Universitas Negeri Makassar (UNM). Universitas Negeri Makassar has been concerning on the pre-service teacher’s education. UNM has the capacity to promote “Building Resilience”, its is the ability to cope and prosper in the face of unfavorable events, obstacles, or adversity. Social competence, responsibility, optimism, hope for the future, attachment to family, self-efficacy, and favorable respect are all important characteristics of resilience in school-aged children and adolescents. UNM as one of the leading educational universities in Indonesia can collaborate with schools to enhance resilience through programs which build positive social norms and generate a sense of connectedness to teachers, peers, and the academic goals of the school. The cooperation should provide a program that focuses on improving personal and social capabilities, such as self-awareness, self-management, social awareness, and social management, using an evidence-based approach.
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.
Download or read book A High Resolution Study of Proton Inelastic Scattering from p207 sPb p208 sPb and p209 sBi written by William Thomas Wagner and published by . This book was released on 1974 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book The Proton Coulomb Form Factor from Polarized Inclusive E p Elastic Scattering at Q2 written by Christopher Matthew Harris and published by . This book was released on 2001 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Problems Of Fundamental Modern Physics Proceedings Of The 4th Winter School On Hadronic Physics written by Roberto Cherubini and published by World Scientific. This book was released on 1990-01-01 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main goal of the School is to guide the young physicists on the methods of carrying out research and to propose to them some present open problems on fundamental modern physics. The School permits the encounter and the exchange of ideas of expert scientists belonging to different areas of research in fundamental modern physics.
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).
Download or read book Resolution of the Proton Spin Problem written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A number of lines of investigation into the structure of the nucleon have converged to the point where we believe that one has a consistent explanation of the well known proton spin crisis.
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.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Moscow Physical Society written by and published by . This book was released on 1996 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Issues in Hadron Physics written by J. Thanh Van Tran and published by Atlantica Séguier Frontières. This book was released on 1988 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quarks And Nuclei written by Wolfram Weise and published by World Scientific. This book was released on 1985-04-01 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents:Constituents of the Atomic Nucleus (B Povh)Quarks, Chiral Symmetry and Dynamics of Nuclear Constituents (W Weise)The Chiral Quark Bag: Properties and Spectroscopy of Baryons and the Nuclear Force (F Myhrer)Building the Nucleus from Quarks: the Cloudy Bag Model and the Quark Description of the Nucleon- Nucleon Wave Function (G A Miller)Deep Inelastic Lepton- Nucleus Scattering (H J Pirner)Baryon-baryon Interaction from Quark Model Viewpoint (M Oka & K Yazaki)From Phenomenological to Macroscopic Description of NN Annihilation (A M Green & J A Niskanen) Readership: Nuclear physicists. Keywords:Quarks;Nuclei;Chiral Symmetry;Dynamics;Baryons
Download or read book Few body Problems In Physics Proceedings Of The 3rd Asia pacific Conference written by Yupeng Yan and published by World Scientific. This book was released on 2007-01-29 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Asia-Pacific Conferences on Few-Body Problems in Physics tackle cover the various aspects of few-body systems in physics, with high caliber contributions from internationally renowned researchers. Readers will gain a clear picture of the latest developments in the field in both the theoretical and experimental sectors.The scope of these proceedings covers research in the following areas: three-body forces and few-nucleon dynamics, hadron structure and QCD; exotic hadrons and atoms; effective field theory in few-body physics; electromagnetic and weak processes in few-body systems; few-body dynamics in atoms, molecules, Bose-Einstein condensates and quantum dots; few-body approaches to unstable nuclei, nuclear astrophysics and nuclear clustering aspects; and hypernuclear physics.
Download or read book Topical Problems of Nonlinear Wave Physics written by Alexander M. Sergeev and published by SPIE-International Society for Optical Engineering. This book was released on 2006 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes Proceedings Vol. 7821
