Showing 4 of 74 results
We present a measurement of the cross sections for the associated production of a $W$ boson with at least one heavy quark jet, $b$ or $c$, in proton-antiproton collisions. Data corresponding to an integrated luminosity of 8.7 fb$^{-1}$ recorded with the D0 detector at the Fermilab Tevatron \ppbar Collider at $\sqrt{s}=1.96$ TeV are used to measure the cross sections differentially as a function of the jet transverse momenta in the range 20 to 150 GeV. These results are compared to calculations of perturbative QCD theory as well as predictions from Monte Carlo generators.
The $W + b$-jet production cross sections times $W \to \mu\nu$ branching fraction, ${\rm d}\sigma/{\rm d}p_T^{\rm jet}$.
The $W + c$-jet production cross sections times $W \to \mu\nu$ branching fraction, ${\rm d}\sigma/{\rm d}p_T^{\rm jet}$.
The $\sigma(W+c)/\sigma(W+b)$ cross section ratio in bins of $c(b)$-jet $p_T$.
A measurement of the beauty production cross section in ep collisions at a centre-of-mass energy of 319 GeV is presented. The data were collected with the H1 detector at the HERA collider in the years 1999-2000. Events are selected by requiring the presence of jets and muons in the final state. Both the long lifetime and the large mass of b-flavoured hadrons are exploited to identify events containing beauty quarks. Differential cross sections are measured in photoproduction, with photon virtualities Q^2 < 1 GeV^2, and in deep inelastic scattering, where 2 < Q^2 < 100 GeV^2. The results are compared with perturbative QCD calculations to leading and next-to-leading order. The predictions are found to be somewhat lower than the data.
Muons and jets from beauty photoproduction, pseudorapidity.
Muons and jets from beauty photoproduction, muon transverse momentum.
Muons and jets from beauty photoproduction, leading jet transverse momentum
Muons and jets from beauty photoproduction, energy fraction of the exchanged photon entering the hard subprocess
Muons and jets from beauty in deep-inelastic scattering, negative momentum transfer squared $Q^2$. Jets are reconstructed in the Breit frame of reference.
Muons and jets from beauty in deep-inelastic scattering, Bjorken-x. Jets are reconstructed in the Breit frame of reference.
Muons and jets from beauty in deep-inelastic scattering, muon pseudorapidity. Jets are reconstructed in the Breit frame of reference.
Muons and jets from beauty in deep-inelastic scattering, muon transverse momentum. Jets are reconstructed in the Breit frame of reference.
Muons and jets from beauty in deep-inelastic scattering, leading jet transverse momentum. Jets are reconstructed in the Breit frame of reference.
Muons and jets from beauty in photoproduction and deep-inelastic scattering. in photoproduction, two jets are required, with transverse momentum above 7 and 6 GeV, respectively. In Deep-inelastic scattering, jets are reconstructed in the Breit frame of reference, and only one jet is required, with transverse momentum above 6 GeV.
Multihadronic e+e− annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q2-Q1, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p⊥, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e+e− data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z0, are also presented.
Aplanarity distribution.
QX Distribution(QX=SQRT(3)*(Q3-Q2)).
The (Q2-Q1) distribution.
Sphericity distribution.
Thrust distribution.
The minor value distribution.
Oblateness distribution.
The invariant mass square of the broad jet.
The invariant mass square of the slim jet.
The mass square difference of the broad and slim jet.
The transverse momentum distribution with respect to the sphericity axis.
The transverse momentum distribution with respect to the sphericity axis.
The momentum distribution out of the event plane.
The transverse momentum distribution in the event plane with respect to the sphericity axis.
The scaled momentum distribution.
Rapidity distribution (folded around yrap=0).
The charged particle flow with respect to the sphericity axis.
The energy flow with respect to the sphericity axis.
Aplanarity distribution.
QX Distribution (QX=SQRT(3)*(Q3-Q2).
The (Q2-Q1) distributions.
Sphericity distribution.
Thrust distribution.
The minor value distribution.
Oblateness distribution.
The invariant mass square of the broad jet.
No description provided.
The mass square difference of the broad and slim jet.
The transverse momentum disribution with respect to the sphericity axis.
The transverse momentum distribution with respect to the sphericity axis.
The momentum distribution out of the event plane.
The transverse momentum distribution in the event plane with respect to the sphericity axis.
The scaled momentum distribution.
Rapidity distribution (folded around yrap=0).
The charged particle flow with respect to the sphericity axis.
No description provided.
Aplanarity distribution.
QX distribution (QX=SQRT(3)*(Q3-Q2).
The (Q2-Q1) distribution.
Sphericity distribution.
Thrust distribution.
The minor value distribution.
Oblateness distribution.
The invariant mass square of the broad jet.
The invariant mass square of the slim jet.
The mass square difference of the broad and slim jet.
The transverse momentum distribution with respect to the sphericity axis.
The transverse momentum distribution with respect to the sphericity axis.
The momentum distribution out of the event plane.
The transverse momentum distribution in the event plane with respect to the sphericity axis.
No description provided.
Rapidity distribution (folded around yrap=0).
The charged particle flow with respect to the sphericity axis.
The energy flow with respect to the sphericity axis.
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
Axis error includes +- 0.0/0.0 contribution (?////SYSTEMATIC ERRORS IN CORRECTIONSVARIOUS CORRECTIONS USING MONTE-CARLO SIMULATION).
We present results from a high momentum resolution measurement of the π − p elastic differential cross section near the η production threshold. By analysing the cusp discontinuity in the elastic cross section we deduce the non-spin-flip elastic amplitude and compare it with solutions from phase-shift analyses.
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