1,174 research outputs found
Photoconduction and photocontrolled collective effects in the Peierls conductor TaS
Light illumination of thin crystals of CDW conductor TaS is found to
result in dramatic changes of both linear () and nonlinear conduction. The
increase of is accompanied by suppression of the collective conduction,
growth of the threshold field , and appearance of the switching and
hysteretic behavior in the nonlinear conduction. The effects in the nonlinear
conduction are associated with increase of CDW elasticity due to illumination
that leads in particular to appearance of a relation
expected for the one-dimensional pinning.Comment: RevTeX4, 4 pages, 4 postscript figures. Revised manuscript, new
title, new Fig. 1, text corrections. Journal reference adde
TMD parton densities in associated real and virtual photon and jet production at LHC
We study the associated production of real (isolated) or virtual photons
(with their subsequent leptonic decay) and hadronic jets in proton-proton
collisions at the LHC using the -factorization approach of QCD. The
consideration is based on the off-shell quark-gluon QCD Compton scattering
subprocesses. In the case of virtual photon production, the contributions from
Z boson exchange as well as gamma*-Z interference with the full spin
correlations are included. The transverse momentum dependent (TMD) quark and
gluon densities in a proton are determined from the Kimber-Martin-Ryskin
prescription or Catani-Ciafoloni-Fiorani-Marchesini (CCFM) equation. In the
latter, we restricted to the case where the gluon-to-quark splitting occurs at
the last evolution step and calculate the sea quark density as a convolution of
the CCFM-evolved gluon distribution and the TMD gluon-to-quark splitting
function. Our numerical predictions are compared with the recent experimental
data taken by the ATLAS Collaboration. We discuss the theoretical uncertainties
of our calculations and argue that further studies are capable of constraining
the TMD parton densities in a proton.Comment: 11 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1402.549
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