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Search for a fourth-generation quark more massive than the Z(0) boson in p(p)over-bar collisions at root s=1.8 TeV

Affolder, T; Akimoto, H; Akopian, A; Albrow, MG; Amaral, P; Amendolia, SR; Amidei, D; ... CDF Collaboration, The; + view all (2000) Search for a fourth-generation quark more massive than the Z(0) boson in p(p)over-bar collisions at root s=1.8 TeV. Physical Review Letters , 84 (5) 835 - 840. 10.1103/PhysRevLett.84.835. Green open access

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Abstract

We present the results of a search for pair production of a fourth-generation charge -1/3 quark (b') in root s = 1.8 TeV p (p) over bar collisions using 88 pb(-1) of data obtained with the Collider Detector at Fermilab. We assume that both quarks decay via the flavor-changing neutral current process b' --> bZ(0) and that the b' mass is greater than m(Z) + m(b). We studied the decay mode b'<(b')over bar> --> Z(0)Z(0)b (b) over bar where one Z(0) decays into e(+) e(-) or mu(+) mu(-) and the other decays hadronically, giving a signature of two leptons plus jets. An upper limit on the sigma(p (p) over bar --> b'<(b')over bar>) x [B(b' --> bZ(0))](2) is established as a function of the b' mass. We exclude at 95% confidence level a b' quark with mass between 100 and 199 GeV/c(2) for B(b' --> bZ(0)) = 100%.

Type: Article
Title: Search for a fourth-generation quark more massive than the Z(0) boson in p(p)over-bar collisions at root s=1.8 TeV
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.84.835
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.84.835
Language: English
Additional information: © 2000 The American Physical Society
Keywords: NEUTRAL-CURRENT DECAY, TOP-QUARK, B' QUARK, LEPTONS, MODEL, SYMMETRY, PHOTONS, TRISTAN, CHARGE, EVENTS
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/131944
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