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Quantum Chromodynamics (QCD) is the gauge theory that governs the strong interactions between quarks and gluons inside hadrons like, for example, protons and neutrons. It shows two well established characteristics, related to the non-Abelian nature of the theory, that dominate its phenomenology: asymptotic freedom and color confinement. The dependence of the strong coupling, [alpha]{sub s}(Q2), with the hard scale is such that it decreases with decreasing the distance between partons. This allows to perform precise theoretical calculations at large energy transfer (short distances) using perturbative QCD (pQCD). On the other hand, the strength of the interaction increases with the distance between partons and thus colored quarks and gluons are forced to be confined inside colorless hadrons.
The D0 and CDF proton-antiproton collider experiments at the Tevatron accumulated large samples of high energy jet production data during Run I (1992- 1996). Presented here are measurements of the central inclusive jet cross section at center-of-mass energies of 1800 and 630 GeV (by the D0 and CDF experiments) and a forward).
Inclusive jet cross section and dijet angular distribution results from the CDF and D0 collaborations are presented. The possibility that compositeness might be evident at high transverse energies is explored by both experiments. Using the angular distributions, the CDF analysis excludes at the 95% CL regions with?
Quantum Chromodynamics (QCD) is the gauge theory that governs the strong interactions between quarks and gluons inside hadrons like, for example, protons and neutrons. At the Tevatron at Fermilab, protons and antiprotons collide at very high energy. In those collisions, collimated jets of hadrons are produced along the direction of struck quarks and gluons in the final state. The measurement of the inclusive jet production cross section for central jets constitutes one of the cornerstones of the jet physics program since it provides a stringent test of pQCD predictions over almost nine orders of magnitude. This Doctoral Thesis presents a measurement of the inclusive jet production cross section using the data collected by the CDF experiment in Run II. The longitudinally invariant Kt algorithm, infrared safe to all orders in pQCD, has been used in order to search for jets in the final state. This measurement is compared to pQCD NLO calculations where non-perturbative effects from the underlying event and the fragmentation of partons into jets of hadrons have been taken into account.
Preliminary results on inclusive jet production in proton-antiproton collisions at {radical}s = 1.96 TeV based on 1 fb{sup -1} of CDF Run II data are presented. Measurements are preformed using different jet algorithms in a wide range of jet transverse momentum and jet rapidity. The measured cross sections are compared to next-to-leading order perturbative QCD calculations.
A preliminary measurement is presented of the inclusive jet production cross section in p{bar p} collisions at a center-of-mass energy of (square root)s = 1960GeV: The data was taken with the D0 detector and represents an integrated luminosity of (almost equal to) 900 pb−1 of Tevatron RunII data. The cross section is studied as a function of jet transverse momentum (p{sub T}) and rapidity (y) and compared to perturbative QCD predictions in next-to-leading order including two-loop threshold corrections.
Measurements of the inclusive jet cross section and the dijet angular distribution using data from the Tevatron are presented Comparisons to NLO QCD show good agreement below 250 GeV, but CDF data show an excess at higher E{sub T}; qualitative agreement is seen between the CDF and D0 cross sections. Analysis of the dijet angular distributions exclude quark compositeness below 2.1 TeV.
The authors have studied the W + ≥ n jets process in Tevatron Run II experiment. This is the first result for the CDF Run II experiment. The data used corresponds to a total integrated luminosity of 72 pb−1 taken from March 2002 through January 2003. The lowest order QCD predictions have been tested with a new prescription of the parton-jet matching, which allows to construct the enhanced LO phase space. They found a good agreement between data and theory in the typical kinematics distributions. Number of events for each inclusive samples up to 3 jets are compared with Monte Carlo calculations. The comparison with Run I results is also presented.