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Register a new userDetermination of the Absolute Jet Energy Scale in the DZERO Calorimeters
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The DZERO detector is used to study proton-antiproton collisions at the 1800 GeV and 630 GeV center-of-mass energies available at the Fermilab Tevatron. To measure jets, the detector uses a sampling calorimeter composed of uranium and liquid argon as the passive and active media respectively. Understanding the jet energy calibration is not only crucial for precision tests of QCD, but also for the measurement of particle masses and the determination of physics backgrounds associated with new phenomena. This paper describes the energy calibration of jets observed with the DZERO detector at the two proton-antiproton center-of-mass energies in the transverse energy and pseudorapidity range ET>8 GeV and pseudorapidity<3.
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We study the impact of new set of cuts, proposed in our previous works, on the improvement of accuracy of the jet energy calibration with p p ->photon+Jet+X process at LHC. Monte Carlo events produced by the PYTHIA 5.7 generator are used for this aim. The selection criteria for photon+jet event samples that would provide a good balance of photon Pt with jet Pt and would allow to reduce the background are described. The distributions of these events over photon Pt and jet pseudorapidity are presented. The features of photon+jet events in the barrel region of the CMS detector (|eta^{jet}| < 1.4) are exposed. The efficiency of the cuts used for background suppression is demonstrated. It is shown that the samples of photon+jet events, gained with the cuts for the jet energy calibration, may have enough statistics for determining the gluon distribution inside a proton in the region of x > 2*10^{-4} and of Q^2 by two orders higher than that studied at HERA.
A possibility of jet energy scale setting by help of ``p p -> Z0+jet+X process at LHC is studied. The effect of new set of cuts, proposed in our previous works, on the improvement of the Pt balance between Z0 boson and jet is demonstrated. The distributions of the selected events over Z0 transverse momentum and jet pseudorapidity are presented. A possibility of background events suppression by use of the Z0+jet events selection criteria is shown. It is also found that the samples of Z0+jet events, gained with the cuts for the jet energy calibration, may have enough statistics for determining the gluon distribution inside a proton in the region of 2*10^{-4} < x < 1.0$ with 0.9*10^3 < Q^2 < 4*10^4 (GeV/c)^2. Monte Carlo events produced by the PYTHIA 5.7 generator are used here.
The consequences of application of new set of criteria, proposed in our previous works, for the improvement of a jet energy calibration accuracy with the process p~p->photon+jet+X at Tevatron and for a reduction of background events contribution are studied. The efficiencies of the used selection criteria are estimated. The distributions of these events over photon Pt and jet pseudorapidity are presented. The features of photon+jet events in the central calorimeter region of the D0 detector (|eta|<0.7) are investigated. It is also shown that the samples of photon+jet events, selected with the cuts used for the jet energy calibration, may have the statistics sufficient for determining the gluon distribution function of a proton in the region of 2*10^{-3}< x < 1.0 and the values of Q^2 by one order higher than that reached in the experiments at HERA. Monte Carlo events produced by the PYTHIA 5.7 generator are used for this aim.
Jets originating from the fragmentation of quarks and gluons are the most common, and complicated, final state objects produced at hadron colliders. A precise knowledge of their energy calibration is therefore of great importance at experiments at the Large Hadron Collider at CERN, while is very difficult to ascertain. We present in-situ techniques and results for the jet energy scale at ATLAS using recent collision data. ATLAS has demonstrated an understanding of the necessary jet energy corrections to within approx 4% in the central region of the calorimeter.
The article describes the identification of hadronically decaying tau leptons in ppbar collisions at 1.96 TeV collected by the DZero detector at the Fermilab Tevatron. After a brief description of the motivations and the challenges of considering tau leptons in high energy hadronic collisions, details of the tau reconstruction and identification will be discussed. The challenges associated for tau energy measurements in an hadronic environment will be presented including approaches to deal with such measurements.
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