A Search for Supersymmetric Quarks and Gluons in $$p\bar{p}$$ Collisions at 1.8-TeV with the CDF Detector

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1996

DOI:https://doi.org/10.2172/1422807· OSTI ID:1422807

Keyvan, Farhad ^[1]

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1. UCLA

This thesis reports on a search for Supersymmetric (SUSY) partners of the Standard Model (SM) quark (squark $$^{\sim}_q$$) and gluon (gluino $$^{\sim}_g$$) in 1.8 TeV $$p\bar{p}$$ Collisions at CDF. The search uses 19.0 $$pb^{-1}$$ of Run 1A (1992-93) data. According to the Minimal Supesymmetric Standard Model (MSSM), which provides the context for this search, squarks and gluinos can be created in pairs at the Tevatron, and subsequently decay into missing transverse energy ( $$E_T$$) and jets. The data consists of 2.0 million DST events from the Exotic data stream. The $$E_T$$ plus multijet channel is dominated by several major and minor backgrounds. These backgrounds can be divided into two distinct groups: 1) non-physics (spoiled events due to bad runs, detector problems, and cosmic rays), 2) physics (events due to W, Z, top decays, and QCD). Cuts on the data are applied to cleanup the non-physics events, and to remove the physics backgrounds as much as possible without gross reduction in signal efficiency. After all cuts, 23 events are left containing three or more jets and large $$E_T$$ . There are 6 events containing four jets and large $$E_T$$ . There are no

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1422807
• Report Number(s): FERMILAB-THESIS-1997-13; UMI-96-39852; 429121
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS