151 research outputs found
Heavy Flavor Production in DGLAP improved Saturation Model
The saturation model with DGLAP evolution is shown to give good description
of the production of the charm and beauty quarks in deep inelastic scattering.
The modifications of saturation properties caused by the presence of heavy
quarks are also discussed.Comment: 4 pages, 3 figures; Talk presented at the International Workshop on
Deep-Inelastic Scattering and Related Subjects, Munich, Germany, April 16-20,
200
Diffraction at Tevatron and LHC in the Miettinen-Pumplin model
The process of soft diffractive dissociation in hadronic collisions is
discussed in the framework of the Miettinen-Pumplin model. A good description
of the data in the ISR-Tevatron energy range is found. Predictions for the
total, elastic and single diffractive cross sections for the LHC are also
presented. The total cross section is expected to be 15% smaller than that
given by Donnachie and Landshoff in the model with soft pomeron. The
diffractive cross section remains constant in the Tevatron-LHC energy range.Comment: 6 pages, 3 figures; Talk presented at the XLV Cracow School of
Theoretical Physics, Zakopane, Poland, June 3-12, 200
Total, elastic and diffractive cross sections at LHC in the Miettinen-Pumplin model
Predictions for the total, elastic and single diffractive cross sections
calculated for the LHC in the framework of the Miettinen-Pumplin model are
presented. The total cross section is expected to be 15% smaller than that
determined by Donnachie and Landshoff in the model with soft pomeron. The
diffractive cross section is almost constant in the Tevatron-LHC energy range.Comment: 8 pages, 5 figures, revised version to appear in Phys.Lett.
New simpler method of matching NLO corrections with parton shower Monte Carlo
Next steps in development of the KrkNLO method of implementing NLO QCD
corrections to hard processes in parton shower Monte Carlo programs are
presented. This new method is a simpler alternative to other well-known
approaches, such as MC@NLO and POWHEG. The KrkNLO method owns its simplicity to
the use of parton distribution functions (PDFs) in a new, so-called Monte Carlo
(MC), factorization scheme which was recently fully defined for the first time.
Preliminary numerical results for the Higgs-boson production process are also
presented.Comment: 8 pages, 5 JPG figures, conference: "Loops and Legs in Quantum Field
Theory", 24-29 April 2016, Leipzig, German
Matching NLO QCD with parton shower in Monte Carlo scheme - the KrkNLO method
A new method of including the complete NLO QCD corrections to hard processes
in the LO parton-shower Monte Carlo (PSMC) is presented. This method, called
KrkNLO, requires the use of parton distribution functions in a dedicated Monte
Carlo factorization scheme, which is also discussed in this paper. In the
future, it may simplify introduction of the NNLO corrections to hard processes
and the NLO corrections to PSMC. Details of the method and numerical examples
of its practical implementation, as well as comparisons with other
calculations, such as MCFM, MC@NLO, POWHEG, for single -boson
production at the LHC, are presented.Comment: 50 pages, 14 figures. Version published in JHEP: added a comparison
of krkNLO results and the fixed-order NNLO result from the DYNNLO program and
addressed several points raised by the refere
Di-boson Production beyond NLO QCD and Anomalous Couplings
In these proceedings, we review results for several di-boson production
processes beyond NLO QCD at high transverse momenta using the VBFNLO
Monte-Carlo program together with the LOOPSIM method. Additionally, we show for
the WZ production process how higher order QCD corrections can resemble
anomalous coupling effects.Comment: Conference Proceedings:C15-05-25.
Saturation effects in forward-forward dijet production in p+Pb collisions
We study saturation effects in the production of forward dijets in
proton-lead collisions at the Large Hadron Collider, using the framework of
High Energy Factorization. Such configurations, with both jets produced in the
forward direction, probe the gluon density of the lead nucleus at small
longitudinal momentum fraction, and also limit the phase space for emissions of
additional jets. We find significant suppression of the forward dijet azimuthal
correlations in proton-lead versus proton-proton collisions, which we attribute
to stronger saturation of the gluon density in the nucleus than in the proton.
In order to minimize model dependence of our predictions, we use two different
extensions of the Balitsky-Kovchegov equation for evolution of the gluon
density with sub-leading corrections.Comment: 13 pages, 4 figures; v2: added figure 4, several clarifying sentences
and a reference; version accepted by PR
Diffractive production at high energies in the Miettinen-Pumplin model
The model of soft diffractive dissociation proposed some time ago by
Miettinen and Pumplin is shown to describe correctly the data at FERMILAB
energies. The comparison with Goulianos model of renor malized pomeron flux is
also presented.Comment: 5 pages, 2 figures, LHC predictions removed, submitted to Phys.Lett.
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