A search for charge 1/3 third generation leptoquarks in muon channels

Thesis/Dissertation · Tue Aug 01 04:00:00 EDT 2006

DOI:https://doi.org/10.2172/907801· OSTI ID:907801

Uzunyan, Sergey A. ^[1]

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1. Northern Illinois Univ., DeKalb, IL (United States)

Leptoquarks are exotic particles that have color, electric charge, and lepton number and appear in extended gauge theories and composite models. Current theory suggests that leptoquarks would come in three different generations corresponding to the three quark and lepton generations. We are searching for charge 1/3 third generation leptoquarks produced in p$$\bar{p}$$ collisions at √s = 1.96 TeV using data collected by the D0 detector. Such leptoquarks would decay into either a tau-neutrino plus a b-quark or, if heavy enough, to a tau-lepton plus a t-quark. We present preliminary results on an analysis where both leptoquarks decay into neutrinos giving a final state with missing energy and two b-quarks using 367 pb^-1 of Run II D0 data taken between August 2002 and September 2004. We place upper limits on σ(p$$\bar{p}$$ → LQ$$\bar{LQ}$$)B² as a function of the leptoquark mass M_LQ. Assuming B = 1, we exclude at the 95% confidence level third generation leptoquarks with M_LQ < 197 GeV/c².

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 907801
• Report Number(s): FERMILAB-THESIS--2006-36
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
COLOR
COMPOSITE MODELS
DECAY
ELECTRIC CHARGES
Experiment-HEP
LEPTON NUMBER
LEPTONS
MUONS
NEUTRINOS
QUARKS