1,978 research outputs found
Diffractive dissociation in proton-nucleus collisions at collider energies
The cross section for the nuclear diffractive dissociation in proton-lead
collisions at the LHC is estimated. Based on the current theoretical
uncertainties for the single (target) diffactive cross section in hadron-hadron
reactions one obtains sigma_SD(5.02 TeV) = 19.67 \pm 5.41 mb and sigma_SD(8.8
TeV) = 18.76 \pm 5.77 mb, respectively. The invariant mass M_X for the reaction
pPb -> pX is also analyzed. Discussion is performed on the main theoretical
uncertainties associated to the calculations.Comment: 04 pages, 2 figures. Final version to be published in European
Physical Journal A - "Hadrons and Nuclei
Exclusive photoproduction of quarkonium in proton-nucleus collisions at energies available at the CERN Large Hadron Collider
In this work we investigate the coherent photoproduction of psi(1S), psi(2S)
and Upsilon (1S) states in the proton-nucleus collisions in the LHC energies.
Predictions for the rapidity distributions are presented using the color dipole
formalism and including saturation effects that are expected to be relevant at
high energies. Calculations are done at the energy 5.02 TeV and also for the
next LHC run at 8.8 TeV in proton-lead mode. Discussion is performed on the
main theoretical uncertainties associated to the calculations.Comment: 05 pages, 5 figures. Version to be published in Phys. Rev.
Light vector meson photoproduction in hadron-hadron and nucleus-nucleus collisions at the energies available at the CERN Large Hadron Collider
In this work we analyse the theoretical uncertainties on the predictions for
the photoproduction of light vector mesons in coherent pp, pA and AA collisions
at the LHC energies using the color dipole approach. In particular, we present
our predictions for the rapidity distribution for rh0 and phi photoproduction
and perform an analysis on the uncertainties associated to the choice of vector
meson wavefunctionand the phenomenological models for the dipole cross section.
Comparison is done with the recent ALICE analysis on coherent production of rho
at 2.76 TeV in PbPb collisions.Comment: 07 pages, 6 figures. Version to be published in Phys. Rev.
Double charmed meson production in and collisions at the LHC within the dipole approach in momentum representation
A study of double charmed meson production in proton-proton and
proton-nucleus collisions at the LHC energies is performed. Based on the color
dipole formalism developed in the transverse momentum representation and the
double parton scattering mechanism, predictions are made for the transverse
momentum differential cross section for different pairs of -mesons. The
theoretical results consider the center-of-mass energy and forward rapidities
associated to the measurements by the LHCb Collaboration. The results
considering different unintegrated gluon distributions are presented and
compared to data and predictions for proton-nucleus collisions are provided.Comment: 20 pages, 4 figure
The color dipole picture for prompt photon production in and collisions at the CERN-LHC
A study on the prompt photon production within the QCD color dipole picture
with emphasis in and collisions at the LHC energy regimes is
performed. We present predictions for the differential cross section as a
function of photon transverse momentum at different rapidity bins considering
updated phenomenological color dipole models, which take into account the QCD
gluon saturation physics. The results are directly compared to the recent
experimental measurements provided by CMS and ATLAS Collaborations, showing a
reasonable agreement in all rapidity bins with no free parameters. Special
attention is given to the IPSAT model given its good description of the data in
all rapidity bins from low- to high- ranges. As a result, a
free-parameter approach has succeeded in describing the LHC data for prompt
photon production, while new predictions for the 13-TeV data is presented in
view of new data to confirm such prospect.Comment: 12 pages, 18 figure
A study on the isolated photon production in nuclear collisions at the CERN-LHC energies
An analysis of prompt photon production in high energy nuclear collisions at
the LHC energy regime is performed within the parton saturation picture taking
into account the updated phenomenological color dipole models. The results are
confronted with the measurements made by the ALICE, ATLAS, and CMS experiments
in terms of photon transverse momentum at different rapidity bins. As a result,
we show that the prompt photon production exhibits distinct scalings in
events associated to geometrical properties of the collision and can be
properly addressed in the color dipole formalism.Comment: 17 pages, 5 figure
Prompt photon production in high-energy collisions at forward rapidity
Prompt photon production in hadronic collisions at the RHIC and the LHC
energies is investigated within the QCD color dipole approach. Predictions for
the nuclear modification factor in collisions are evaluated based on
parton saturation framework and the results are compared to the experimental
measurements as a function of the photon transverse momentum at different
rapidity bins. The reliability of the models is performed with the data from
PHENIX, ATLAS, and ALICE Collaborations. Moreover, we show that the observed
-scaling of prompt photon production in and collisions can
positively be addressed in the QCD color dipole formalism.Comment: 17 pages, 10 figure
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