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Source of Energetic Protons in the 2014 September 1 Sustained Gamma-ray Emission Event.
Sol Phys
February 2020
2The Catholic University of America, Washington, DC USA.
We report on the source of protons during the SOL2014-09-01 sustained gamma-ray emission (SGRE) event based on multi-wavelength data from a wide array of space- and ground-based instruments. Based on the eruption geometry we provide concrete explanation for the spatially and temporally extended -ray emission from the eruption. We show that the associated flux rope is of low inclination (roughly oriented in the east-west direction), which enables the associated shock to extend to the frontside.
View Article and Find Full Text PDFTaming the pion cloud of the nucleon.
Phys Rev Lett
April 2012
Department of Physics, Seattle University, Seattle, Washington 98122, USA.
We present a light-front determination of the pionic contribution to the nucleon self-energy, Σ(π), to second order in pion-baryon coupling constants that allows the pion-nucleon vertex function to be treated in a model-independent manner constrained by experiment. The pion mass μ dependence of Σ(π) is consistent with chiral perturbation theory results for small values of μ and is also linearly dependent on μ for larger values, in accord with the results of lattice QCD calculations. The derivative of Σ(π) with respect to μ(2) yields the dominant contribution to the pion content, which is consistent with the d[over ¯]-u[over ¯] difference observed experimentally in the violation of the Gottfried sum rule.
View Article and Find Full Text PDFFrom quarks and gluons to baryon form factors.
Prog Part Nucl Phys
April 2012
Institut für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany.
I briefly summarize recent results for nucleon and [Formula: see text] electromagnetic, axial and transition form factors in the Dyson-Schwinger approach. The calculation of the current diagrams from the quark-gluon level enables a transparent discussion of common features such as: the implications of dynamical chiral symmetry breaking and quark orbital angular momentum, the timelike structure of the form factors, and their interpretation in terms of missing pion-cloud effects.
View Article and Find Full Text PDFHigh-precision determination of the electric and magnetic form factors of the proton.
Phys Rev Lett
December 2010
Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
New precise results of a measurement of the elastic electron-proton scattering cross section performed at the Mainz Microtron MAMI are presented. About 1400 cross sections were measured with negative four-momentum transfers squared up to Q² = 1 (GeV/c)² with statistical errors below 0.2%.
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