1,795 research outputs found
Exclusive processes with a leading neutron in collisions
In this paper we extend the color dipole formalism to the study of exclusive
processes associated with a leading neutron in collisions at high
energies. The exclusive , and production, as well as the
Deeply Virtual Compton Scattering, are analysed assuming a diffractive
interaction between the color dipole and the pion emitted by the incident
proton. We compare our predictions with the HERA data on production and
estimate the magnitude of the absorption corrections. We show that the color
dipole formalism is able to describe the current data. Finally, we present our
estimate for the exclusive cross sections which can be studied at HERA and in
future electron-proton colliders.Comment: 11 pages, 9 figures. Version published in Physical Review
Diffractive production at small in future Electron - Ion Colliders
The future Electron - Ion () Collider is expected to probe the high
energy regime of the QCD dynamics, with the exclusive vector meson production
cross section being one of the most promising observables. In this paper we
complement previous studies of exclusive processes presenting a comprehensive
analysis of diffractive production at small . We compute the coherent
and incoherent cross sections taking into account non-linear QCD dynamical
effects and considering different models for the dipole - proton scattering
amplitude and for the vector meson wave function. The dependence of these cross
sections with the energy, photon virtuality, nuclear mass number and squared
momentum transfer is analysed in detail. Moreover, we compare the non-linear
predictions with those obtained in the linear regime. Finally, we also estimate
the exclusive photon, and production and compare with the
results obtained for production. Our results demonstrate that the
analysis of diffractive production in future electron - ion colliders
will be important to understand the non-linear QCD dynamics.Comment: 12 pages, 8 figures, 1 table. Enlarged and revised version to be
published in the Journal of Physics G. arXiv admin note: text overlap with
arXiv:1503.0064
Investigating the impact of the gluon saturation effects on the momentum transfer distributions for the exclusive vector meson photoproduction in hadronic collisions
The exclusive vector meson production cross section is one of the most
promising observables to probe the high energy regime of the QCD dynamics. In
particular, the squared momentum transfer () distributions are an important
source of information about the spatial distribution of the gluons in the
hadron and about fluctuations of the color fields. In this paper we complement
previous studies on exclusive vector meson photoproduction in hadronic
collisions presenting a comprehensive analysis of the - spectrum measured
in exclusive , and photoproduction in and
collisions at the LHC. We compute the differential cross sections taking into
account gluon saturation effects and compare the predictions with those
obtained in the linear regime of the QCD dynamics. Our results show that gluon
saturation suppresses the magnitude of the cross sections and shifts the
position of the dips towards smaller values of .Comment: 7 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1612.0625
Exclusive photoproduction in hadronic collisions at CERN LHC energies
The exclusive photoproduction in proton-proton and proton -
nucleus collisions at LHC energies is investigated using the color dipole
formalism and considering different models for the wave function and
forward dipole - target scattering amplitude. Our goal is to update the color
dipole predictions and estimate the theoretical uncertainty present in these
predictions. We present predictions for the kinematical ranges probed by the
ALICE, CMS and LHCb Collaborations.Comment: 8 pages, 5 figures and 3 tables. Version to be published in Physics
Letters
Double vector meson production in photon - hadron interactions at hadronic colliders
In this paper we analyse the double vector meson production in photon --
hadron () interactions at collisions and present
predictions for the , and production
considering the double scattering mechanism. We estimate the total cross
sections and rapidity distributions at LHC energies and compare our results
with the predictions for the double vector meson production in
interactions at hadronic colliders. We present predictions for the different
rapidity ranges probed by the ALICE, ATLAS, CMS and LHCb Collaborations. Our
results demonstrate that the and production in
collisions is dominated by the double scattering mechanism, while the
two - photon mechanism dominates in collisions. Moreover, our results
indicate that the analysis of the production at LHC can be useful
to constrain the double scattering mechanism.Comment: 9 pages, 5 figures, 2 tables. Revised and enlarged version to be
published in the European Physical Journal
Double vector meson production in interactions at hadronic colliders
In this paper we revisit the double vector meson production in interactions at heavy ion collisions and present, by the first time,
predictions for the and production in proton --
nucleus and proton -- proton collisions. In order to obtain realistic
predictions for rapidity distributions and total cross sections for the double
vector production in ultra peripheral hadronic collisions we take into account
of the description of cross section at low
energies as well as its behaviour at large energies, associated to the gluonic
interaction between the color dipoles. Our results demonstrate that the double
production is dominated by the low energy behaviour of the cross section. In contrast, for the double
production, the contribution associated to the description of the QCD dynamics
at high energies contributes significantly, mainly in collisions.
Predictions for the RHIC, LHC, FCC and CEPC - SPPC energies are shown.Comment: 9 pages, 5 figures, 2 tables. arXiv admin note: text overlap with
arXiv:1504.0441
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