Publication Date

2006

Document Type

Dissertation/Thesis

First Advisor

Hedin, David

Degree Name

Ph.D. (Doctor of Philosophy)

Legacy Department

Department of Physics

LCSH

Particles (Nuclear physics); Quarks; Leptons (Nuclear physics)

Abstract

Leptoquarks (LQ) are particles with both color and lepton number predicted in some gauge theories and composite models. Current theory suggests that leptoquarks would come in three different generations. We report on a search for charge 1/3 third generation leptoquarks produced in pp̅ collisions at [squareroot s]=1.96 TeV using data collected by the D0 detector at Fermilab. Such leptoquarks would decay into a tau-neutrino plus a b-quark with branching fraction B. We present preliminary results on an analysis where both leptoquarks decay into neutrinos giving a final state with missing energy and two b-jets. Using 425(recorded) pb⁻¹ of data, we place limits on a(pp̅ —> LQL̅Q̅)B² as a function of the leptoquark mass. Assuming B = 1, we excluded at the 95% confidence level scalar third generation leptoquarks with M[sub LQ]lq < 219 GeV.

Comments

Includes bibliographical references (pages [102]-105).

Extent

xi, 105 pages (some color pages)

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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