Searches for direct pair production of supersymmetric top and supersymmetric bottom quarks in pp collisions at {radical}(s)=1.96 TeV

Journal Article · Mon Oct 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.072010· OSTI ID:21032311

Aaltonen, T; Maki, T; Mehtala, P; Orava, R; Osterberg, K; Saarikko, H; Remortel, N van ^[1]; Abulencia, A; Budd, S; Ciobanu, C I; Errede, D; Errede, S; Gerberich, H; Grundler, U; Junk, T R; Kraus, J; Marino, C P; Pitts, K; Rogers, E; Taffard, A ^[2]

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1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
2. University of Illinois, Urbana, Illinois 61801 (United States)

We search for direct pair production of supersymmetric top quarks and supersymmetric bottom quarks in proton-antiproton collisions at {radical}(s)=1.96 TeV, using 295 pb{sup -1} of data recorded by the Collider Detector at Fermilab (CDF II) experiment. The supersymmetric top (supersymmetric bottom) quarks are selected by reconstructing their decay into a charm (bottom) quark and a neutralino, which is assumed to be the lightest supersymmetric particle. The signature of such processes is two energetic heavy-flavor jets and missing transverse energy. The number of events that pass our selection for each search process is consistent with the expected standard model background. By comparing our results to the theoretical production cross sections of the supersymmetric top and supersymmetric bottom quarks in the minimal supersymmetric standard model, we exclude, at a 95% confidence level in the frame of that model, a supersymmetric top quark mass up to 132 GeV/c{sup 2} for a neutralino mass of 48 GeV/c{sup 2}, and a supersymmetric bottom quark mass up to 193 GeV/c{sup 2} for a neutralino mass of 40 GeV/c{sup 2}.

• OSTI ID: 21032311
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
CROSS SECTIONS
FERMILAB COLLIDER DETECTOR
FLAVOR MODEL
GEV RANGE
JET MODEL
PAIR PRODUCTION
PARTICLE DECAY
PROTON-ANTIPROTON INTERACTIONS
PROTON-PROTON INTERACTIONS
REST MASS
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
T QUARKS
TEV RANGE
TRANSVERSE ENERGY