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ABSTRACT We calculate the associated production of a pseudoscalar (A) with a pair of heavy quarks at hadonic colliders, namely p pbar, pp →QQA + X for Q = b, t and X the remaining partonic interactions, including one-loop QCD corrections, i.e. at Next-to-leading Order (NLO) in QCD. The one-loop amplitude for the parton level processes q qbar, gg → Q Qbar A is calculated both with a traditional Feynman-diagram approach and with more recently proposed on-shell methods and unitarity based techniques. We use this process as a testing ground to learn and compare the new on-shell methods to more traditional techniques in a case where several massive particles are involved. We present results for the full NLO hadronic cross section, at both the Tevatron (p pbar) and the Large Hadron Collider (pp) with the aim to further aid and constrain the parameter space of models with pseudoscalar production at particle colliders.
HIGGS, LHC PHYSICS, ON-SHELL METHODS, OPP, QCD, QUANTUM FIELD THEORY
Date of Defense
June 29, 2012.
A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Includes bibliographical references.
Laura Reina, Professor Directing Thesis; Paolo Aluﬃ, University Representative; Harrison B. Prosper, Committee Member; Takemichi Okui, Committee Member; Simon Capstick, Committee Member.
Florida State University
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