Search for a fourth-generation quark more massive than the Z0 boson in pp¯ collisions at √s = 1.8 TeV

CDF Collaboration

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


We present the results of a search for pair production of a fourth-generation charge -1/3 quark (b′) in √s=1.8 TeV pp¯ 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′→bZ0 and that the b′ mass is greater than mZ+mb. We studied the decay mode b′b′¯→Z0Z0bb¯ where one Z0 decays into e+e or μ+μ and the other decays hadronically, giving a signature of two leptons plus jets. An upper limit on the σpp¯→b′b′¯×[B(b′→bZ0)]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/c2 for B(b′→bZ0)=100%.

Original languageEnglish (US)
Pages (from-to)835-840
Number of pages6
JournalPhysical review letters
Issue number5
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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