17,335 research outputs found
From sine-Gordon to vacuumless systems in flat and curved spacetimes
In this work we start from the Higgs prototype model to introduce a new
model, which makes a smooth transition between systems with well located minima
and systems that support no minima at all. We implement this possibility using
the deformation procedure, which allows the obtention of a sine-Gordon-like
model, controlled by a real parameter that gives rise to a family of models,
reproducing the sine-Gordon and the so-called vacuumless models. We also study
the thick brane scenarios associated with these models and investigate their
stability and renormalization group flow. In particular, one shows how gravity
can change from the 5-dimensional warped geometry with a single extra dimension
of infinite extent to the conventional 5-dimensional Minkowski geometry.Comment: 11 pages, 12 figures. Version to appear in EPJ
Probing the in interactions at the LHC
The production of in the interactions that occur in
proton-proton, proton-nucleus and nucleus-nucleus collisions at the CERN Large
Hadron Collider (LHC) is investigated and predictions for the kinematical
ranges probed by the ALICE and LHCb Collaborations are presented. We focus on
the process, which have been measured
by the Belle Collaboration, and present parameter free predictions for the
total cross sections at the LHC energies. Our results demonstrate that the
experimental study of this process is feasible and can be used to confirm or
not the existence of the state. Finally, for completeness, we present
predictions for the production of the state in the process and show that this exotic state can also be
probed in interactions at the LHC.Comment: 5 pages, 2 figures, 2 table
Exclusive vector meson production with a leading neutron in photon - hadron interactions at hadronic colliders
In this paper we study leading neutron production in photon - hadron
interactions which take place in and collisions at large impact
parameters. Using a model that describes the recent leading neutron data at
HERA, we consider exclusive vector meson production in association with a
leading neutron in collisions at RHIC and LHC energies. The total cross
sections and rapidity distributions of , and produced
together with a leading neutron are computed. Our results indicate that the
study of these processes is feasible and that it can be used to improve the
understanding of leading neutron processes and of exclusive vector meson
production.Comment: 8 pages, 3 figures, 2 table
Counterions at charge-modulated substrates
We consider counterions in the presence of a single planar surface with a
spatially inhomogeneous charge distribution using Monte-Carlo simulations and
strong-coupling theory. For high surface charges, multivalent counterions, or
pronounced substrate charge modulation the counterions are laterally correlated
with the surface charges and their density profile deviates strongly from the
limit of a smeared-out substrate charge distribution, in particular exhibiting
a much increased laterally averaged density at the surface.Comment: 7 page
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