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28 March 2024
 
  » pubmed » pmid11017385

 Article overview


Search for a fourth-generation quark more massive than the Z0 boson in p&pmacr; collisions at radicals = 1.8 TeV
W Trischuk ; de Troconiz JF ; S Truitt ; J Tseng ; N Turini ; F Ukegawa ; J Valls ; S Vejcik ; G Velev ; R Vidal ; R Vilar ; I Vologouev ; D Vucinic ; R G Wagner ; R L Wagner ; J Wahl ; N B Wallace ; A M Walsh ; C Wang ; C H Wang ; M J Wang ; T Watanabe ; D Waters ; T Watts ; R Webb ; H Wenzel ;
Date 31 Jan 2000
Journal Phys Rev Lett, 84 (5), 835-40
AbstractWe present the results of a search for pair production of a fourth-generation charge -1 / 3 quark (b(’)) in sqrt[s] = 1.8 TeV p&pmacr; 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(’);-->Z(0)Z(0)b&bmacr; where one Z0 decays into e(+)e(-) or &mgr;(+)&mgr;(-) and the other decays hadronically, giving a signature of two leptons plus jets. An upper limit on the sigma(p&pmacr;-->b(’)b(’);)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%.
Source PubMed, pmid11017385
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