The search for physics beyond the standard model in the b(bar)b spectrum observed in Tevatron proton-antiproton collisions
Abstract
Many extensions have been proposed to the Standard Model of fundamental particles and interactions, therefore we have conducted a general search with the Collider Detector at Fermilab (CDF) for particles which would be expected to appear as a resonance in the bb¯ mass spectrum produced in proton-antiproton collisions at a center-of-mass energy of [special characters omitted] TeV at the Fermilab Tevatron collider. We use 87.3 pb−1 of data collected from 1993–1995 during collider Run 1B to reconstruct the bb¯ mass spectrum from 150–625 GeV/c2. The spectrum is found to be in good agreement with simulations of direct bb¯ production, and is therefore used to set limits on a variety of new phenomena. We present model independent upper limits on the cross section for resonances decaying with a natural width that is narrower than the CDF bb¯ mass resolution, which excludes the color octet technirho predicted in walking technicolor theories between 350 and 440 GeV/c2. In addition, we exclude topgluons, predicted in models of topcolor assisted technicolor, of width Γ = 0.3 M in the mass range 280 < M < 670 GeV/c 2, of width Γ = 0.5M in the mass range 340 < M < 640 GeV/c2, and of width Γ = 0.7M in the mass range 375 < M < 560 GeV/c2.
Degree
Ph.D.
Advisors
Bortoletto, Purdue University.
Subject Area
Particle physics
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