skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of event shapes in pp̄ collisions at √s=1.96 TeV

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less

A study of event-shape observables in proton-antiproton collisions at √s=1.96  TeV is presented. The data for this analysis were recorded by the CDF II Detector at the Tevatron Collider. The variables studied are the transverse thrust and thrust minor, both defined in the plane perpendicular to the beam direction. The observables are measured using energies from unclustered calorimeter cells. In addition to studies of the differential distributions, we present the dependence of event-shape mean values on the leading-jet transverse energy. Data are compared with pythia Tune A and to resummed parton-level predictions that were matched to fixed-order results at next-to-leading-order (NLO) accuracy (NLO+NLL). Predictions from pythia Tune A agree fairly well with the data. However, the underlying event contributes significantly to these observables, making it difficult to make direct comparisons to the NLO+NLL predictions, which do not account for the underlying event. To overcome this difficulty, we introduce a new observable, a weighted difference of the mean values of the thrust and thrust minor, which is less sensitive to the underlying event, allowing for a comparison with NLO+NLL. Both pythia Tune A and the NLO+NLL calculations agree well within the 20% theoretical uncertainty with the data for this observable, indicating that perturbative QCD successfully describes shapes of the hadronic final states.

Sponsoring Organization:
USDOE
OSTI ID:
1099630
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Vol. 83 Journal Issue: 11; ISSN 1550-7998
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

References (29)

Jet measures and hadronic event shapes at the CERN $$\bar p$$ p collider journal June 1987
Underlying event in hard interactions at the Fermilab Tevatron p ¯ p collider journal October 2004
Topology of three-jet events in p ¯ p collisions at s = 1.8 TeV journal March 1992
Renormalons journal August 1999
Simple Quantum-Chromodynamics Prediction of Jet Structure in e + e Annihilation journal November 1977
A measurement of the QCD colour factors using event shape distributions at $\sqrt{s}=14$ to 189 GeV journal June 2001
Initial state radiation effects onW and jet production journal March 1986
Principles of general final-state resummation and automated implementation journal March 2005
Hadronic jet production at the CERN proton-antiproton collider journal November 1983
Measurement of the J / ψ meson and b -hadron production cross sections in p p ¯ collisions at s = 1960 G e V journal February 2005
Event shapes in e + e   annihilation and deep inelastic scattering journal February 2004
Inclusive jet production, parton distributions, and the search for new physics journal October 2003
Measurement of QCD jet broadening in p p ¯ collisions at s = 1.8 TeV journal August 1991
αs determination from event shapes at DELPHI journal March 1999
Measurements of αs from QCD event shapes at OPAL and LEP journal June 2003
Determination of αs from event shapes and power corrections journal May 1998
Quantum Chromodynamics Test for Jets journal December 1977
αs 2002 journal June 2003
Global QCD analysis of parton structure of the nucleon: CTEQ5 parton distributions journal February 2000
Tests of power corrections for event shapes in ${\mathrm{e^+e^-}$ annihilation journal September 2001
Event shapes in e+e− annihilation journal March 1979
Search for gluons in e+e− annihilation journal August 1976
A model for initial state parton showers journal July 1985
Generalized resummation of QCD final-state observables journal April 2004
A multiple-interaction model for the event structure in hadron collisions journal October 1987
Resummed event shapes at hadron-hadron colliders journal August 2004
Phenomenology of event shapes at hadron colliders journal June 2010
Next-to-leading order calculation of three-jet observables in hadron-hadron collisions journal November 2003
Determination of the jet energy scale at the Collider Detector at Fermilab
  • Bhatti, A.; Canelli, F.; Heinemann, B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 566, Issue 2 https://doi.org/10.1016/j.nima.2006.05.269
journal October 2006

Similar Records

Measurement of Event Shapes in Proton-Antiproton Collisions at Center-of-Mass Energy 1.96 TeV
Journal Article · Tue Mar 01 00:00:00 EST 2011 · Submitted to Phys.Rev.D · OSTI ID:1099630

Study of direct photon production with heavy flavor jets in $p\overline{p}$ collisions at $\sqrt{s}=1.96$ TeV with DZero detector
Thesis/Dissertation · Sun Jan 01 00:00:00 EST 2017 · OSTI ID:1099630

Measurement of b-quark Jet Shapes at CDF
Thesis/Dissertation · Sun Jan 01 00:00:00 EST 2006 · OSTI ID:1099630

Related Subjects