50 research outputs found
Inclusion of Parton Distribution Functions in PYTHIA8
A selection of the latest and most frequently used PDFs is incorporated in
PYTHIA8, including the MC-adapted PDFs from the MSTW and CTEQ collaborations.
This thesis examines the differences in PDFs as well as the effect they have on
results of simulations. The results are also compared to data collected by the
CDF experiment.Comment: 35 pages; changed preprint numbe
Parton correlations in double parton scattering
Double parton scattering events are directly sensitive to the correlations
between two partons inside a proton and can answer fundamental questions on the
connections between the proton constituents. In this chapter, the different
types of possible correlations, our present knowledge of them, and the
processes where they are likely to be important, are introduced and explained.
The increasing integrated luminosity at the LHC and the refinements of the
theory of double parton scattering, lead to interesting prospects for
measuring, or severely constraining, two-parton correlations in the near
future.Comment: Prepared for: Multiple Parton Interactions at the LHC, Eds. P.
Bartalini and J. R. Gaunt, World Scientific, Singapore; v2: references adde
A Comparison of new MC-adapted Parton Densities
A selection of the latest and most frequently used parton distribution
functions (PDFs) is incorporated in Pythia8, including the Monte Carlo-adapted
PDFs from the MSTW and CTEQ collaborations. This article examines the
differences in PDFs as well as the effect they have on results of simulations
and compare with data collected by the CDF experiment. Monte Carlo-adapted PDFs
do a better job than leading- and next-to-leading order PDFs for many
observables, but there is room for further improvements.Comment: 14 page
Polarization effects in double open-charm production at LHCb
Double open-charm production is one of the most promising channels to
disentangle single from double parton scattering (DPS) and study different
properties of DPS. Several studies of the DPS contributions have been made. A
missing ingredient so far has been the study of polarization effects, arising
from spin correlations between the two partons inside an unpolarized proton. We
investigate the impact polarization has on the double open-charm cross section.
We show that the longitudinally polarized gluons can give significant
contributions to the cross section, but for most of the considered kinematic
region only have a moderate effect on the shape. We compare our findings to the
LHCb data in the D0D0 final state, identify observables where polarization does
have an impact on the distribution of the final state particles, and suggest
measurements which could lead to first experimental indications of, or limits
on, polarization in DPS.Comment: 16 pages, 13 figure