370 research outputs found
Diffractive Double-Elastic Production of ' and in the Reaction
I discuss double-diffractive (double-elastic) production of the and
mesons in the reaction within the formalism of
unintegrated gluon distribution functions (UGDF). The contribution of fusion is estimated. The distributions in the Feynman
(or rapidity), transferred four-momenta squared between initial and final
protons (, ) and azimuthal angle difference between outgoing protons
() are calculated and discussed. The results are compared with the WA102
data. Predictions at higher energies are presented.Comment: a talk presented at the international conference MESON2006, Cracow,
Poland, June, 2006; 5 pages, 3 figures, 1 tabl
Diffractive pQCD mechanisms of exclusive production of dijets and pairs in proton-proton collisions
We discuss central exclusive production of pairs in proton-proton
collisions at LHC. Predictions for the total cross section and differential
distributions in transverse momentum of and invariant mass are
presented. We discuss both mechanism as well as a
new mechanism of exclusive diffractive production. The amplitude for the latter
process is calculated in the Durham model. We compare the two (QED and QCD)
types of contributions. The diffractive contribution is only a small fraction
of fb compared to the contribution which is of the order of 100
fb. This opens a possibility of searches for anomalous four-boson coupling due to physics beyond Standard Model.Comment: invited talk at the DIS2012 workshop, Bonn, Germany, 26-30 March 201
Central meson production in diffractive reactions
I discuss double-diffractive (double-elastic) production of the and
mesons in the reaction within the formalism of
unintegrated gluon distribution functions (UGDF). The contribution of fusion is estimated. The distributions in the Feynman
(or rapidity), transferred four-momenta squared between initial and final
protons (, ) and azimuthal angle difference between outgoing protons
() are calculated and discussed. The results are compared with the WA102
data. Predictions at higher energies are presented.Comment: 7 pages, 6 figures a talk at International Workshop on Diffraction in
High-Energy Physics - DIFFRACTION 2006, Adamantas, Milos island, Greece,
September 5-10, 200
Production of pairs at LHC: -factorization and double-parton scattering
We discuss charm production at LHC. The production of single pairs
is calculated in the -factorization approach. We use several unintegrated
gluon distributions from the literature. Differential distributions for several
charmed mesons are presented and compared to recent results of the ALICE and
LHCb collaborations. Some missing strength can be observed. Furthermore we
discuss production of two pairs within a simple formalism of
double-parton scattering (DPS). Surprisingly large cross sections, comparable
to single-parton scattering (SPS) contribution to production, are
predicted for LHC energies.Comment: invited talk at DIS2012 workshop, Bonn, Germany, 26-30 March 201
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