6,194 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
Viabilidade de consorciação sorgo granífero (Sorghum bicolor) e feijao (Phaseolus vulgaris) na região Norte de Minas Gerais.
Multi-q Pattern Classification of Polarization Curves
Several experimental measurements are expressed in the form of
one-dimensional profiles, for which there is a scarcity of methodologies able
to classify the pertinence of a given result to a specific group. The
polarization curves that evaluate the corrosion kinetics of electrodes in
corrosive media are an application where the behavior is chiefly analyzed from
profiles. Polarization curves are indeed a classic method to determine the
global kinetics of metallic electrodes, but the strong nonlinearity from
different metals and alloys can overlap and the discrimination becomes a
challenging problem. Moreover, even finding a typical curve from replicated
tests requires subjective judgement. In this paper we used the so-called
multi-q approach based on the Tsallis statistics in a classification engine to
separate multiple polarization curve profiles of two stainless steels. We
collected 48 experimental polarization curves in aqueous chloride medium of two
stainless steel types, with different resistance against localized corrosion.
Multi-q pattern analysis was then carried out on a wide potential range, from
cathodic up to anodic regions. An excellent classification rate was obtained,
at a success rate of 90%, 80%, and 83% for low (cathodic), high (anodic), and
both potential ranges, respectively, using only 2% of the original profile
data. These results show the potential of the proposed approach towards
efficient, robust, systematic and automatic classification of highly non-linear
profile curves.Comment: 12 pages, 7 figure
Quarkonium+ production in coherent hadron - hadron interactions at LHC energies
In this paper we study the ( and )
production in coherent hadron - hadron interactions at LHC energies.
Considering the ultrarelativistic protons as a source of photons, we estimate
the cross section using the
non-relativistic QCD (NRQCD) factorization formalism and considering different
sets of values for the matrix elements. Our results for the total cross sections and rapidity distributions at
and 14 TeV demonstrate that the experimental analysis of the
production at LHC is feasible.Comment: 6 pages, 3 figures, 1 table. Improved version with a new figure.
Version to be published in European Physical Journal
Double particle production in ultraperipheral collisions at the Large Hadron Collider and Future Circular Collider
In this paper we analyze the associated production of a vector meson with a
(pseudo)scalar bound state or a dimuon system in ultraperipheral
collisions through the double scattering mechanism for the energies of the
Large Hadron Collider (LHC) and Future Circular Collider (FCC). Our results
complement previous studies for the double vector meson production. We present
our predictions for the total cross sections and rapidity distributions
considering the rapidity ranges covered by the ALICE and LHCb detectors, which
indicate that a future experimental analysis of the , and final states is feasible.Comment: 6 pages, 2 figures, 1 table. arXiv admin note: text overlap with
arXiv:2210.0486
Associated and photoproduction in ultraperipheral collisions at the Large Hadron Collider and Future Circular Collider
In this paper we analyze the associated and photoproduction
in ultraperipheral collisions through the double scattering mechanism
for the energies of the Large Hadron Collider (LHC) and Future Circular
Collider (FCC). Our results complement a previous analysis for the ,
and production. We present our predictions for
the total cross sections and rapidity distributions considering the rapidity
ranges covered by the ALICE and LHCb detectors, which indicate that a future
experimental analysis of final state is feasible. These results
point out that the study of the double vector meson photoproduction in heavy
ion collisions can be useful to constrain the double scattering mechanism and
improve our understanding of the QCD dynamics at high energies.Comment: 6 pages, 3 figures, 1 tabl
Associated vector meson and bound-free electron-positron pair photoproduction in ultraperipheral collisions
In this letter we analyze the associated production of a vector meson with
the bound - free process in ultraperipheral collisions through
the double scattering mechanism for the energy of the Large Hadron Collider
(LHC). Such process is characterized by the presence of a meson and a positron
in the final state and by a forward hydrogen - like ion with a distinct
electric charge. We present our predictions for the total cross sections and
rapidity distributions considering the rapidity ranges covered by the ALICE and
LHCb detectors, which indicate that a future experimental analysis of the and final states is feasible.Comment: 5 pages, 2 figures, 1 table. arXiv admin note: substantial text
overlap with arXiv:2306.0551
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