11,974 research outputs found
New measurements of the proton's size and structure using polarized photons
Improved measurements of the proton's structure are now possible thanks to
significant technical advances that allow us to probe the proton with polarized
photons. These measurements have shown that the proton is not as simple as
previously believed: quark orbital angular momentum and relativistic effects
play an important role and the spatial distribution of charge and magnetization
do not simply mimic the spatial distribution of the quarks. Even more recently,
the large scale structure and size of the proton have been examined more
carefully, and a significant discrepancy has been observed between the charge
radius of the proton as measured in the Lamb shift of muonic hydrogen and
measurements using the electron-proton interaction.Comment: 8 pages, 3 figures. Proceedings of plenary talk at CIPANP 2012, St
Petersburg, FL, May 28 - June 3, 201
Scanning the issue: T-ray imaging, sensing, and retection
Copyright © 2007 IEEEDerek Abbott, Xi-Cheng Zhan
diffractive production in the direct photon process at HERA
We present a study of diffractive production in the direct
photon process at HERA based on the factorization theorem for lepton-induced
hard diffractive scattering and the factorization formalism of the
nonrelativistic QCD (NRQCD) for quarkonia production. Using the diffractive
gluon distribution function extracted from HERA data on diffractive deep
inelastic scattering and diffractive dijet photon production, we show that this
process can be studied at HERA with present integrated luminosity, and can give
valuable insights in the color-octet mechanism for heavy quarkonia production.Comment: Revtex, 21 pages, 7 EPS figure
Special Issue "Top-down Proteomics: In Memory of Dr Alfred Yergey". Alfred Linwood Yergey, III, 17 September 1941-27 May 2018.
Please see J [...]
Comment on 'Nanoscale mapping of optical band gaps using monochromated electron energy loss spectroscopy' by Zhan, Granerød, Venkatachalapathy, Johansen, Jensen, Kuznetsov and Prytz in Nanotechnology 28 (2017) 105703
Comment on ‘Nanoscale mapping of optical band gaps using monochromated electron
energy loss spectroscopy’ by Zhan, Granerød, Venkatachalapathy, Johansen, Jensen,
Kuznetsov and Prytz in Nanotechnology 28 (2017) 10570
A new approach to the study of the ground-state properties of 2D Ising spin glass
A new approach known as flat histogram method is used to study the +/-J Ising
spin glass in two dimensions. Temperature dependence of the energy, the
entropy, and other physical quantities can be easily calculated and we give the
results for the zero-temperature limit. For the ground-state energy and entropy
of an infinite system size, we estimate e0 = -1.4007 +/- 0.0085 and s0 = 0.0709
+/- 0.006, respectively. Both of them agree well with previous calculations.
The time to find the ground-states as well as the tunneling times of the
algorithm are also reported and compared with other methods.Comment: 11 pages, 4 figure
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