932 research outputs found
Measurement of the ratio of inclusive cross sections in collisions at TeV
We measure the ratio of cross sections, /, for
associated production of a boson with at least two jets with transverse
momentum GeV and pseudorapidity .
This measurement uses data corresponding to an integrated luminosity of 9.7
fb collected by the \DO experiment in Run II of Fermilab's Tevatron
\ppbar Collider at a center-of-mass energy of 1.96 TeV. The measured integrated
ratio of
0.0236\pm0.0032\left(\mbox{stat}\right)\pm0.0035\left(\mbox{syst}\right) is
in agreement with predictions from next-to-leading-order perturbative QCD and
the Monte Carlo event generators {\sc pythia} and {\sc alpgen}
Precision measurement of the top-quark mass in lepton+jets final states
We measure the mass of the top quark in leptonjets final states using the
full sample of collision data collected by the D0 experiment in Run
II of the Fermilab Tevatron Collider at TeV, corresponding to
of integrated luminosity. We use a matrix element technique
that calculates the probabilities for each event to result from
production or background. The overall jet energy scale is constrained in situ
by the mass of the boson. We measure GeV. This
constitutes the most precise single measurement of the top-quark mass.Comment: submitted to Phys. Rev. D, 40 pages, detailed documentation of Phys.
Rev. Lett. 113, 032002 (2014) [arXiv:1405.1756
Measurement of the differential -jet cross section and the ratio (-jets)/(-jet) in collisions at =1.96 TeV
We present the first measurements of the differential cross section
for the production of an isolated photon in
association with at least two -quark jets. The measurements consider photons
with rapidities and transverse momenta GeV and . The ratio of differential production cross sections for
-jets to -jet as a function of is also
presented. The results are based on the proton-antiproton collision data at
1.96~\TeV collected with the D0 detector at the Fermilab Tevatron
Collider. The measured cross sections and their ratios are compared to the
next-to-leading order perturbative QCD calculations as well as predictions
based on the -factorization approach and those from the SHERPA and
PYTHIA Monte Carlo event generators.Comment: 10 pages, 8 figures, Submitted to Phys. Lett.
Measurement of the distribution of muon pairs with masses between 30 and 500 GeV in 10.4 fb of collisions
We present a measurement of the distribution of the variable
for muon pairs with masses between 30 and 500 GeV, using the complete Run II
data set collected by the D0 detector at the Fermilab Tevatron
proton-antiproton collider. This corresponds to an integrated luminosity of
10.4 fb at = 1.96 TeV. The data are corrected for detector
effects and presented in bins of dimuon rapidity and mass. The variable
probes the same physical effects as the boson
transverse momentum, but is less susceptible to the effects of experimental
resolution and efficiency. These are the first measurements at any collider of
the distributions for dilepton masses away from the boson mass peak. The data are compared to QCD predictions based
on the resummation of multiple soft gluons.Comment: Accepted for publication in Phys.Rev.
Improved quark jet identification at the D0 experiment
The ability to identify jets which originated from quarks is an important
tool of the physics program of the D0 experiment at the Fermilab Tevatron
collider. This article describes a new algorithm designed to select
jets originating from quarks while suppressing the contamination caused by
jets from other quark flavors and gluons. Additionally, a new technique, the
SystemN method, for determining the misidentification rate directly from data
is presented.Comment: Submitted to Nucl. Instrum. Methods Phys. Res.
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