1,201 research outputs found
Collinear and soft resummation in the large-x limit
I discuss general unified formulas for resumming collinear and soft
contributions to QCD hard scattering cross sections at large x. Expansions of
the resummed cross sections to next-to-next-to-next-to-leading order are also
shown along with applications of the formalism.Comment: 4 pages, presented at DPF 2004, Riverside, California, August 26-31,
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Electroweak Measurements
The measurements of electroweak sector of the Standard Model are presented,
including most recent results from LEP, Tevatron and HERA colliders. The
robustness of the Standard Model is illustrated with the precision
measurements, the electroweak fits and the comparisons to the results obtained
from low energy experiments. The status of the measurements of the boson
properties and rare production processes involving weak bosons at colliders is
examined, together with the measurements of the electroweak parameters in
collisions.Comment: 12 pages, Proceedings of "Lepton-Photon 2005", Upsalla, Swede
Transverse Lepton Polarization in Polarized W Decays
Calculations of transverse polarization of leptons in the decay with polarized 's are presented. Planned accelerators will produce
enough 's for observation of the Standard Model contributions to this
polarization. One loop corrections to the polarization are given; these are too
small to be seen at presently available sources. The exchange of Majorons
will contribute to these polarizations; these may provide limits on the
couplings of these particles to leptons.Comment: 8 pages set in RevTex III and 4 uucompressed figures. This revised
version studies polarization effects due to the exchange of charged Majoron
doublet
TARCER - A Mathematica program for the reduction of two-loop propagator integrals
TARCER is an implementation of the recurrence algorithm of O.V. Tarasov for
the reduction of two-loop propagator integrals with arbitrary masses to a small
set of basis integrals. The tensor integral reduction scheme is adapted to
moment integrals emerging in operator matrix element calculations.Comment: 13 pages, LaTeX 2e using elsart.cls, program available at
http://www.mertig.com/tarcer or http://www.physik.uni-leipzig.de/TET/tarce
Fixed target Drell-Yan data and NNLO QCD fits of parton distribution functions
We discuss the influence of fixed target Drell-Yan data on the extraction of
parton distribution functions at next-to-next-to-leading order (NNLO) in QCD.
When used in a parton distribution fit, the Drell-Yan (DY) data constrain sea
quark distributions at large values of Bjorken x. We find that not all
available DY data are useful for improving the precision of parton distribution
functions (PDFs) obtained from a fit to the deep inelastic scattering (DIS)
data. In particular, some inconsistencies between DIS-based parton distribution
functions and DY data for large values of dilepton rapidity are found. However,
by selecting a sample of the DY data that is both representative and consistent
with the DIS data, we are able to perform a combined PDF fit that significantly
improves the precision of non-strange quark distributions at large values of x.
The NNLO QCD corrections to the DY process are crucial for improving the
precision. They reduce the uncertainty of the theoretical prediction, making it
comparable to the experimental uncertainty in DY cross-sections over a broad
range of x.Comment: 12 pages, revte
Threshold corrections to rapidity distributions of Z and W^\pm bosons beyond N^2 LO at hadron colliders
Threshold enhanced perturbative QCD corrections to rapidity distributions of
and bosons at hadron colliders are presented using the Sudakov
resummed cross sections at NLO level. We have used renormalisation group
invariance and the mass factorisation theorem that these hard scattering cross
sections satisfy to construct the QCD amplitudes. We show that these higher
order threshold QCD corrections stabilise the theoretical predictions for
vector boson production at the LHC under variations of both renormalisation and
factorisation scales.Comment: 17 pages, 8 eps figures. This paper is dedicated to the memory of
W.L.G.A.M. van Neerve
Higgs Production at NNLO
We describe the calculation of inclusive Higgs boson production at hadronic
colliders at next-to-next-to-leading order (NNLO) in perturbative quantum
chromodynamics. We have used the technique developed in reference [4]. Our
results agree with those published earlier in the literature.Comment: Talk given at PASCOS'03, TIFR, Mumbai, LaTeX, 5 page
Next-to-Next-to-Leading Order Higgs Production at Hadron Colliders
The Higgs boson production cross section at pp and p\bar{p} colliders is
calculated in QCD at next-to-next-to-leading order (NNLO). We find that the
perturbative expansion of the production cross section is well behaved and that
scale dependence is reduced relative to the NLO result. These findings give us
confidence in the reliability of the prediction. We also report an error in the
NNLO correction to Drell-Yan production.Comment: 5 pages, 4 figures, minor change
Probing small-x parton densities in proton- proton (-nucleus) collisions in the very forward direction
We present calculations of several pp scattering cross sections with
potential applications at the LHC. Significantly large rates for momentum
fraction, x, as low as 10^-7 are obtained, allowing for possible extraction of
quark and gluon densities in the proton and nuclei down to these small x values
provided a detector with good acceptance at maximal rapidities is used.Comment: 14 pages, LaTeX, 12 figures, uses revtex.st
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