153 research outputs found
Exclusive processes in electron - ion collisions
The exclusive processes in electron-ion () interactions are an important
tool to investigate the QCD dynamics at high energies as they are in general
driven by the gluon content of the target, which is strongly subject to parton
saturation effects. In this paper we compute the cross sections for the
exclusive vector meson production as well as the deeply virtual Compton
scattering (DVCS) relying on the color dipole approach and considering the
numerical solution of the Balitsky-Kovchegov equation including running
coupling corrections (rcBK). The production cross sections obtained with the
rcBK solution and bCGC parametrization are very similar, the former being
slightly larger.Comment: 6 pages, 4 figure
An efficient quantum algorithm for finding hidden parabolic subgroups in the general linear group
Constraining the nuclear gluon distribution in processes at RHIC
A systematic determination of the gluon distribution is of fundamental
interest in understanding the parton structure of nuclei and the QCD dynamics.
Currently, the behavior of this distribution at small (high energy) is
completely undefined. In this paper we analyze the possibility of constraining
the nuclear effects present in using the inclusive observables which
would be measured in the future electron-nucleus collider at RHIC. We
demonstrate that the study of nuclear longitudinal and charm structure
functions allows to estimate the magnitude of shadowing and antishadowing
effects in the nuclear gluon distribution.Comment: 6 pages, 3 eps figure
EVALUATION OF NITROGEN MONITORING, BUD FERTILITYAND ‘THOMPSON SEEDLESS’ GRAPEVINE PRODUCTION ON DIFFERENT ROOTSTOCKS
Could saturation effects be visible in a future electron-ion collider?
We expect to observe parton saturation in a future electron - ion collider.
In this letter we discuss this expectation in more detail considering two
different models which are in good agreement with the existing experimental
data on nuclear structure functions. In particular, we study the predictions of
saturation effects in electron - ion collisions at high energies, using a
generalization for nuclear targets of the b-CGC model, which describes the
HERA quite well. We estimate the total, longitudinal and charm structure
functions in the dipole picture and compare them with the predictions obtained
using collinear factorization and modern sets of nuclear parton distributions.
Our results show that inclusive observables are not very useful in the search
for saturation effects. In the small region they are very difficult to
disentangle from the predictions of the collinear approaches . This happens
mainly because of the large uncertainties in the latter. On the other hand, our
results indicate that the contribution of diffractive processes to the total
cross section is about 20 % at large A and small Q^2, allowing for a detailed
study of diffractive observables. The study of diffractive processes becomes
essential to observe parton saturation.Comment: 7 pages 5 figure
Heavy quark production at LHC in the color dipole formalism
In this work we estimate the heavy quark production in proton-proton and
proton-nucleus collisions at LHC energies using the color dipole formalism and
the solution of the running coupling Balitsky-Kovchegov equation. Nuclear
effects are considered in the computation of the total cross sections and
rapidity distributions for scattering on protons and nuclei.Comment: 10 pages, 8 figure
Análise da diversidade genética de isolados de Xanthomonas axonopodis pv. malvacearum do algodoeiro
Moscas frugívoras e seus parasitoides nos municípios de Pelotas e Capão do Leão, Rio Grande do Sul, Brasil
Análise da variabilidade da frequência cardíaca em cordeiros da raça Bergamácia, do nascimento aos 35 dias de idade
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