7,727 research outputs found
The QCD Pomeron in Ultraperipheral Heavy Ion Collisions: IV. Photonuclear Production of Vector Mesons
The photonuclear production of vector mesons in ultraperipheral heavy ion
collisions is investigated within the QCD color dipole picture, with particular
emphasis on the saturation model. The integrated cross section and the rapidity
distribution for the A + A --> V + A + A (V = rho, omega, phi, J/Psi) process
are computed and theoretical estimates for scattering on both light and heavy
nuclei are given for energies of RHIC and LHC. A comparison with the recent
STAR data on coherent production of rho mesons is also presented. Furthermore,
we calculate the photoproduction of vector mesons in proton-proton collisions
at RHIC, Tevatron and LHC energies.Comment: 19 pages, 6 figures and 2 tables. Version to be published in Eur.
Phys. J.
Nuclear Heavy Quark Photoproduction in a Saturation Model
We calculate the nuclear inclusive and diffractive cross sections for heavy
quark photoproduction within a phenomenological saturation approach. The
nuclear cross section is obtained by the extension of the saturation model
through Glauber-Gribov formalism. We predict large nuclear heavy quark cross
section at LHC energies.Comment: 14 pages, 6 figures. Version to be published in Eur. Phys. J.
Diffractive photoproduction of Z^0 bosons in coherent interactions at CERN-LHC
The exclusive photoproduction at high energies in ,
and collisions is investigate within the color dipole formalism. We
generalize the description of the deeply virtual compton scattering (DVCS)
process, which describe quite well the HERA data, for the production of
bosons and estimate the total cross section for the exclusive process () for different energies, photon virtualities and atomic
numbers. As hadrons at collider energies are a source of Weizs\"{a}cker -
Williams photons, we consider electromagnetic interactions in hadron-hadron
collisions at Tevatron and LHC energies and estimate the rapidity distribution
and total cross section for production in the process.
This is the first estimation for such a process in literature. It can allow us
to study, for instance, the physics of hadronic decays in a clean
environment characterized by two rapidity gaps. Our results indicate that the
experimental analyzes of this process could be feasible in but the physics
scenario for collisions is not promising.Comment: 6 pages, 2 figures, 1 table; The erroneus additional factor of
in the normalization of the cross sections is removed. Figures and table are
update
Coherent photon-hadron interactions in pA collisions: Small-x physics after HERA
In this letter we study the photoproduction of heavy quarks and vector mesons
in the coherent proton-nucleus (pA) interactions for RHIC and LHC energies and
analyze if these processes can be used to determine the QCD dynamics at high
energies. The integrated cross section and rapidity distribution are estimated
using the Color Glass Condensate (CGC) formalism. A comparison with the linear
dynamics predictions is also presented. Our results indicate that the nonlinear
dynamics can be proven in those reactions, which are well suited for studing
saturation effects.Comment: 5 pages, 3 figures. Version to be published in Physical Review
The QCD Pomeron in Ultraperipheral Heavy Ion Collisions: II. Heavy Quark Production
The heavy quark production in ultraperipheral heavy ion collisions is
investigated, in particular we focus on the results from the coherent
interactions given by the two-photon process. One addresses the heavy quark
total cross sections at photon level considering the saturation model and the
BFKL dynamics in the color dipole picture. The corresponding cross sections at
nuclear level are presented. It is verified that the QCD dynamics implies an
enhancement of the cross section in comparison with previous calculations.Comment: 16 pages, 7 figures. Version to be published in Eur. Phys. J.
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