Searches for compositeness at the Tevatron

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The existence of three families of quarks and leptons suggests the possibility of a substructure for these objects. The hypothetical constituents known generically as preons, interact via a new strong interaction called Metacolor. The characteristic energy scale, {Lambda}, for the new interactions is, of course, unknown. The strength of the interactions through a contact term can be written as {cflx s}/({alpha}{sub S}{Lambda}{sup 2}), where {cflx s} is the square of the energy in the center of mass frame of the (normal) interacting partons, and {alpha}{sub S} is the QCD coupling. The first limit on the size of the atomic nucleus ... continued below

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347 Kilobytes pages

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Green, J. Andrew May 11, 2000.

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The existence of three families of quarks and leptons suggests the possibility of a substructure for these objects. The hypothetical constituents known generically as preons, interact via a new strong interaction called Metacolor. The characteristic energy scale, {Lambda}, for the new interactions is, of course, unknown. The strength of the interactions through a contact term can be written as {cflx s}/({alpha}{sub S}{Lambda}{sup 2}), where {cflx s} is the square of the energy in the center of mass frame of the (normal) interacting partons, and {alpha}{sub S} is the QCD coupling. The first limit on the size of the atomic nucleus was obtained by Geiger and Mardsen in the Rutherford scattering of {alpha} particles from nuclei. In an analogous way, the authors can set a limit on the size of quarks and leptons by observing the scattering of the highest energy quarks and antiquarks at the Fermilab Tevatron at {bar p}p center-of-mass energy of 1.8 TeV for collider experiments, and proton beam energy of 0.8 TeV for fixed-target experiments. The collider detectors at Fermilab, CDF and D0, have performed searches for compositeness, and this paper gives a summary of those searches. Those detectors are general-purpose, have nearly 4{pi} acceptance, and measure lepton and jet energies to high precision. In addition, the neutrino detector, CCFR, which utilized the 800 GeV proton line at Fermilab has performed a compositeness search.

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347 Kilobytes pages

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  • Rencontres de Blois, Blois (FR), 06/27/1999--07/03/1999

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  • Report No.: FERMILAB-Conf-00/088-E
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 754710
  • Archival Resource Key: ark:/67531/metadc707020

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  • May 11, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 1, 2016, 4:55 p.m.

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Green, J. Andrew. Searches for compositeness at the Tevatron, article, May 11, 2000; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc707020/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.