14,888 research outputs found
High energy DVCS on a photon and related meson exclusive production
In this work we estimate the differential cross section for the high energy
deeply virtual Compton scattering on a photon target within the QCD
dipole-dipole scattering formalism. For the phenomenology, a saturation model
for the dipole-dipole cross section for two photon scattering is considered.
Its robustness is supported by good description of current accelerator data. In
addition, we consider the related exclusive vector meson production processes.
This analysis is focused on the light and meson production, which
produce larger cross sections. The phenomenological results are compared with
the theoretical calculation using the CD BFKL approach.Comment: 6 pages, 5 figures. Version to be published in Physical Review
Charm and bottom production in inclusive double Pomeron exchange in heavy ion collisions at the LHC
The inclusive double Pomeron exchange cross section for heavy quark pair
production is calculated for nucleus-nucleus collisions at the LHC. The present
estimate is based on hard diffractive factorization, corrected by absorptive
corrections and nuclear effects. The theoretical uncertainties for nuclear
collisions are investigated and a comparison to other approaches is presented.
The production channels producing a similar final state configuration are
discussed as well.Comment: 7 pages, 3 tables. Final version to be published in Physical Review
Distorted Neutrino Oscillations From Ultralight Scalar Dark Matter
Cold, ultralight ( eV) bosonic dark matter with a misalignment abundance
can induce temporal variation in the masses and couplings of Standard Model
particles. We find that fast variations in neutrino oscillation parameters can
lead to significantly distorted neutrino oscillations (DiNOs) and yield
striking signatures at long baseline experiments. We study several
representative observables to demonstrate this effect and find that current and
future experiments including DUNE and JUNO are sensitive to a wide range of
viable scalar parameters over many decades in mass reach.Comment: 5+2 pages, 4 figures , 2 appendice
Structure and Magnetic Properties of a 1D Alternating Cu(II) Monomer―Paddlewheel Chain
One-dimensional metal–organic coordination polymers make up a class of compounds with potential towards the development of practical, new magnetic materials. Herein, a rare example of an ABBABB coupled linear chain comprised of alternating dicopper(II) tetraacetate units bridged to copper(II) acetate monomer units via axial η2:η1:µ2 coordinated acetate is reported. Examination of the structure, determined by small molecule X-ray crystallography, shows that each Cu(II) ion is in a dx2–y2 magnetic ground state. Magnetic susceptibility and magnetization data were collected and, consistent with the structural interpretation, demonstrate that the Cu(II) dimer (paddlewheel) exhibits classic antiferromagnetic exchange, while the S = 1/2 Cu(II) monomer is uncompensated in the ground state (low temperature regime.) Data were therefore fitted to a modified Bleaney-Bowers model, and results were consistent with the only other reported chain in this class for which magnetic data are available
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