Searches for new quarks and leptons produced in Z-boson decay

We have searched for events with new-particle topologies in 390 hadronic {ital Z} decays with the Mark II detector at the SLAC Linear Collider. We place 95%-confidence-level lower limits of 40.7 GeV/{ital c}{sup 2} for the top-quark mass, 42.0 GeV/{ital c}{sup 2} for the mass of a fourth-generation...

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Veröffentlicht in:	Physical review letters 1989-11, Vol.63 (22), p.2447-2451
Hauptverfasser:	Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Gomez Cadenas JJ, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J
Format:	Artikel
Sprache:	eng
Schlagworte:	645101 - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties 645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties ACCELERATOR FACILITIES ACCELERATORS ANNIHILATION BASIC INTERACTIONS BOSONS BRANCHING RATIO ELECTROMAGNETIC INTERACTIONS ELECTRON-POSITRON INTERACTIONS ELEMENTARY PARTICLES ENERGY RANGE FERMIONS GEV RANGE GEV RANGE 10-100 INTERACTIONS INTERMEDIATE BOSONS INTERMEDIATE VECTOR BOSONS LEPTON-LEPTON INTERACTIONS LEPTONS LINEAR ACCELERATORS MASS MONTE CARLO METHOD NEUTRAL-CURRENT INTERACTIONS PARTICLE INTERACTIONS PARTICLE PRODUCTION PHYSICS OF ELEMENTARY PARTICLES AND FIELDS POSTULATED PARTICLES QUARKS STANFORD LINEAR COLLIDER TOP PARTICLES Z NEUTRAL BOSONS
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Zusammenfassung:	We have searched for events with new-particle topologies in 390 hadronic {ital Z} decays with the Mark II detector at the SLAC Linear Collider. We place 95%-confidence-level lower limits of 40.7 GeV/{ital c}{sup 2} for the top-quark mass, 42.0 GeV/{ital c}{sup 2} for the mass of a fourth-generation charge {minus}(1/3) quark, and 41.3 GeV/{ital c}{sup 2} for the mass of an unstable Dirac neutral lepton.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.63.2447