Search for top-quark decays to real /ital W/ bosons at the Fermilab Tevatron collider

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.39.3310· OSTI ID:6140504

Baer, H; Barger, V; Phillips, R J. N.

We propose ways in which eventual signals from heavy-top-quark decays into on-shell or nearly-on-shell /ital W/ bosons may be discriminated more sharply from background at the Fermilab Tevatron /ital p/bar /p/ collider. For single-lepton /ital t/bar /t/ signals, the principal background from direct /ital W/ production cannot be eliminated by acceptance cuts alone, but the signal/background ratio can be greatly increased by requiring a high jet multiplicity /ital n/. Top-quark signals can be detected and /ital m//sub /ital t// can be measured via enhancements in the single-lepton event rates at high /ital n/, or via a peak in the invariant mass of the three hardest jets at high /ital n/. A /ital t/bar /t/ signal can be extracted up to /ital m//sub /ital t//=150 GeV (180 GeV) from selected data with /ital n/greater than or equal to3 (/ital n/greater than or equal to4) jets. For two-lepton /ital t/bar /t/ signals, the principal standard-model backgrounds from /ital b/bar /b/,/ital c/bar /c/ and Drell-Yan dilepton production can all be removed by cuts. The remaining backgrounds from direct /ital W//sup +/W/sup /minus// and Drell-Yan /tau/bar ///tau/ production can be suppressed to a level well below the /ital t/bar /t/ signals, for the whole of the mass range up to /ital m//sub /ital t//=200 GeV allowed for the standard model. Eventual /ital t/bar /t/ signals can be confirmed by characteristic dynamical distributions. An integrated luminosity of 10 pb/sup /minus/1/ (100 pb/sup /minus/1/) would be enough to detect top quarks up to /ital m//sub /ital t//=120 GeV (200 GeV).

• Research Organization: Physics Department, Florida State University, Tallahassee, Florida 32306(US); Physics Department, University of Wisconsin, Madison, Wisconsin 53706; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, England
• OSTI ID: 6140504
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 39:11; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON-BARYON INTERACTIONS
BOSONS
CYCLIC ACCELERATORS
DECAY
DRELL MODEL
ELEMENTARY PARTICLES
FERMILAB TEVATRON
FIELD THEORIES
HADRON-HADRON INTERACTIONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
JET MODEL
LUMINOSITY
MATHEMATICAL MODELS
NUCLEON-ANTINUCLEON INTERACTIONS
OPTICAL PROPERTIES
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHYSICAL PROPERTIES
POSTULATED PARTICLES
PROTON-ANTIPROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
STANDARD MODEL
SYNCHROTRONS
TOP PARTICLES
UNIFIED GAUGE MODELS
W MINUS BOSONS
W PLUS BOSONS