QCD at DOe: A Review of Recent Results
- Louisiana Tech University, Ruston, LA 71272 (United States)
We report a variety of measurements of hadronic final states, ranging from elastic scattering of protons to events with highly energetic jets, based on data taken with the DOe experiment at the Fermilab Tevatron proton-antiproton collider.Starting with the non-perturbative regime, we report measurement of the pp-bar elastic differential scattering cross section, using DOe's Forward Proton Detectors (FPD). We present a new way to describe minimum bias events based on angular distributions in {approx_equal}5 million minimum bias pp-bar collisions collected between April 2002 and February 2006 with the DOe detector. We demonstrate that the distribution of {Delta}{phi} in the detector transverse plane between the leading track and all other tracks is a robust observable that can be used for tuning of multiple color interaction models. Pseudorapidity correlations of the {Delta}{phi} distributions are also studied. In addition, we present a measurement of the effective cross section for events produced by double parton scattering.DOe has produced a wide-variety of analyzes of final states involving jets, using a well-understood and calibrated data sample. Inclusive jet cross-sections, dijet production, and multi-jet production have been studied and compared to next-to-leading order (NLO) perturbative Quantum Chromodynamics (pQCD) predictions. After reviewing several published measurements, including the inclusive jet cross section and extraction of the strong coupleing constant {alpha}{sub s}, and the dijet angular dependence and azimuthal decorrelation, we present several recent analyszes. The differential inclusive dijet as a function of the dijet invariant mass Mjj, and the three-jet cross section as a function of the invariant three-jet mass (M{sub 3jet}), are measured in a data set corresponding to an integrated luminosity of 0.7 fb{sup -1}. NLO pQCD calculations are found to be in a reasonable agreement with the measured cross sections.Based on the same data set, we present the first measurement of ratios of multi-jet cross sections in pp-bar collisions at {radical}(s) = 1.96 TeV at the Fermilab Tevatron Collider. The ratio of inclusive trijet and dijet cross sections, R{sub 3/2}, has been measured as a function of the transverse jet momenta. The data are compared to QCD model predictions in different approximations.
- OSTI ID:
- 21516691
- Journal Information:
- AIP Conference Proceedings, Vol. 1348, Issue 1; Conference: 5. international workshop on high-pT physics at LHC, Mexico City (Mexico), 27 Sep - 1 Oct 2010; Other Information: DOI: 10.1063/1.3579434; (c) 2011 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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