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Measurement of dijet angular distributions at CDF

Journal Article · · Phys.Rev.Lett.
We have used 106 pb~-1 of data collected in proton-antiproton collisions at sqrt(s)=1.8 TeV by the Collider Detector at Fermilab to measure jet angular distributions in events with two jets in the final state. The angular distributions agree with next to leading order (NLO) predictions of Quantum Chromodynamics (QCD) in all dijet invariant mass regions. The data exclude at 95% confidence level (CL) a model of quark substructure in which only up and down quarks are composite and the contact interaction scale is Lambda_ud(+) < 1.6 TeV or Lambda_ud(-) < 1.4 TeV. For a model in which all quarks are composite the excluded regions are Lambda(+) < 1.8 TeV and Lambda(-) < 1. 6 TeV.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
CDF
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1861334
Report Number(s):
FERMILAB-PUB-96-317-E; CDF-PUB-JET-PUBLIC-3773; FERMILAB-PUB-98-173-ED; FERMILAB-PUB-98-173-EG; arXiv:hep-ex/9609011; oai:inspirehep.net:423414
Journal Information:
Phys.Rev.Lett., Journal Name: Phys.Rev.Lett. Vol. 77
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS