5,743 research outputs found
Flux tubes in the SU(3) vacuum
We analyze the distribution of the chromoelectric field generated by a static
quark-antiquark pair in the SU(3) vacuum. We find that the transverse profile
of the flux tube resembles the dual version of the Abrikosov vortex field
distribution and give an estimate of the London penetration length in the
confined vacuum.Comment: 7 pages, 3 figures, poster contribution to the XXIX International
Symposium on Lattice Field Theory, LATTICE 201
Reflective Scattering and Unitarity
Interpretation of unitarity saturation as reflective scattering is discussed.
Analogies with optics and Berry phase alongside with the experimental
consequences of the proposed interpretation at the LHC energies are considered.Comment: 4 pages, 1 figure, talk given by S. Troshin at Diffraction 2008,
September 9-14, La Londe-les-Maures, Franc
Studying the Sivers function by model calculations
A formalism is presented to evaluate the Sivers function in constituent quark
models. A non-relativistic reduction of the scheme is performed and applied to
the Isgur-Karl model. The sign for the and flavor contributions that we
obtained turns out to be opposite. The Burkardt Sum Rule is fulfilled to a
large extent. After the estimate of the QCD evolution of the results from the
momentum scale of the model to the experimental one, a reasonable agreement
with the available data is obtained.Comment: To appear in the proceedings of Diffraction 2008: International
Workshop On Diffraction In High Energy Physics, 9-14 Sep 2008, La
Londe-les-Maures, France. Misprints corrected, reference adde
Interactions suppress Quasiparticle Tunneling at Hall Bar Constrictions
Tunneling of fractionally charged quasiparticles across a two-dimensional
electron system on a fractional quantum Hall plateau is expected to be strongly
enhanced at low temperatures. This theoretical prediction is at odds with
recent experimental studies of samples with weakly-pinched
quantum-point-contact constrictions, in which the opposite behavior is
observed. We argue here that this unexpected finding is a consequence of
electron-electron interactions near the point contact.Comment: 4 page
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