780 research outputs found
High-energy central exclusive production of the lightest vacuum resonance related to the soft Pomeron
A simple model based on Regge approach is proposed for description of the
central exclusive production (CEP) of the light tensor glueball lying on the
Regge trajectory of the soft Pomeron.Comment: 8 pages; a few references have been adde
Current stage of understanding and description of hadronic elastic diffraction
Current stage of development of the high-energy elastic diffractive
scattering phenomenology is reviewed. Verification of various theoretical
models via comparison of their predictions with the recent D0 and TOTEM data on
the nucleon-nucleon total and differential cross-sections is presented.Comment: Talk given at DIFFRACTION 2012, the 7th International Workshop on
Diffraction in High-Energy Physics, September 10-15, 2012, Puerto del Carmen,
Lanzarote, Canary Island
Nonlinear Regge Trajectories in Theory and Practice
The problems related to nonlinear behavior of Regge trajectories (RT) and
their renormalization group invariance are discussed.Comment: The extended version of the talk at the International Workshop
Diffraction-2008 (La Londe-les-Maures, France, September 9 - 14, 2008
Nonlinearity of vacuum reggeons and exclusive diffractive production of vector mesons at HERA
The processes of exclusive photo- and electroproduction of vector mesons
(770), (1020) and (3096) at collision energies and transferred momenta squared are considered in
the framework of a phenomenological Regge-eikonal scheme with nonlinear Regge
trajectories in which their QCD asymptotic behavior is taken into account
explicitly. By comparison of available experimental data from ZEUS and H1
Collaborations with the model predictions it is demonstrated that corresponding
angular distributions and integrated cross-sections in the above-mentioned
kinematical range can be quantitatively described with use of two -even
vacuum Regge trajectories. These are the "soft" pomeron dominating the high
energy reactions without a hard scale and the "hard" pomeron giving an
essential contribution to photo- and electroproduction of heavy vector mesons
and deeply virtual electroproduction of light vector mesons.Comment: 25 pages, 12 figure
Elastic and scattering at LHC
We discuss the possibility of measuring leading neutron production at the
LHC. These data could be used to extract from it and
cross-sections. In this note we give some estimates for the case of elastic
cross-sections and discuss related problems and prospects.Comment: 26 pages, 25 figures, to be published, minor text correction
Strong interface-induced spin-orbit coupling in graphene on WS2
Interfacial interactions allow the electronic properties of graphene to be
modified, as recently demonstrated by the appearance of satellite Dirac cones
in the band structure of graphene on hexagonal boron nitride (hBN) substrates.
Ongoing research strives to explore interfacial interactions in a broader class
of materials in order to engineer targeted electronic properties. Here we show
that at an interface with a tungsten disulfide (WS2) substrate, the strength of
the spin-orbit interaction (SOI) in graphene is very strongly enhanced. The
induced SOI leads to a pronounced low-temperature weak anti-localization (WAL)
effect, from which we determine the spin-relaxation time. We find that
spin-relaxation time in graphene is two-to-three orders of magnitude smaller on
WS2 than on SiO2 or hBN, and that it is comparable to the intervalley
scattering time. To interpret our findings we have performed first-principle
electronic structure calculations, which both confirm that carriers in
graphene-on-WS2 experience a strong SOI and allow us to extract a
spin-dependent low-energy effective Hamiltonian. Our analysis further shows
that the use of WS2 substrates opens a possible new route to access topological
states of matter in graphene-based systems.Comment: Originally submitted version in compliance with editorial guidelines.
Final version with expanded discussion of the relation between theory and
experiments to be published in Nature Communication
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