Search for Third Generation Vector Leptoquarks in 1.96 TeV Proton-Antiproton Collisions, (Thesis/Dissertation).

Akimoto, T.

Technical Information Center Oak Ridge Tennessee

关键词: Proton-antiproton interactions;    Cross sections;    Decay;    Fermilab collider detector;    Pair production;   

RP-ID  :  DE2008923526

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The CDF experiment has searched for production of a third generation vector leptoquark (VLQ3) in the di-tau plus di-jet channel using 322 pb(sup -1) of Run II data. We review the production and decay theory and describe the VLQ3 model we have used as a benchmark. We study the analysis, including the data sample, triggers, particle identification, and event selection. We also discuss background estimates and systematic uncertainties. We have found no evidence for VLQ3 production and have set a 95% C.L. upper limit on the pair production cross section (sigma) to 344 fb, and exclude VLQ3 in the mass range m(sub VLQ3) > 317 GeV/c(sup 2), assuming Yang-Mills couplings and Br(LQ3 (yields) b(tau)) = 1. If theoretical uncertainties on the cross section are taken into account, the results are (sigma) < 353 fb and m(sub VLQ3) > 303 GeV/c(sup 2). For a VLQ3 with Minimal couplings, the upper limit on the cross section is (sigma) < 493 fb ((sigma) < 554 fb) and the lower limit on the mass is m(sub VLQ3) > 251 GeV/c(sup 2) (m(sub VLQ3) > 235 GeV/c(sup 2)) for the nominal (1(sigma) varied) theoretical expectation.