@article{fd58288a48fe405e8eefbd92f7d01859,

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

abstract = "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%.",

author = "{CDF Collaboration} and T. Affolder and H. Akimoto and A. Akopian and Albrow, {M. G.} and P. Amaral and Amendolia, {S. R.} and D. Amidei and J. Antos and G. Apollinari and T. Arisawa and T. Asakawa and W. Ashmanskas and M. Atac and F. Azfar and P. Azzi-Bacchetta and N. Bacchetta and Bailey, {M. W.} and S. Bailey and {de Barbaro}, P. and A. Barbaro-Galtieri and Barnes, {V. E.} and Barnett, {B. A.} and M. Barone and G. Bauer and F. Bedeschi and S. Belforte and G. Bellettini and J. Bellinger and D. Benjamin and J. Bensinger and A. Beretvas and Berge, {J. P.} and J. Berryhill and S. Bertolucci and B. Bevensee and A. Bhatti and C. Bigongiari and M. Binkley and D. Bisello and Blair, {R. E.} and C. Blocker and K. Bloom and B. Blumenfeld and Blusk, {B. S.} and A. Bocci and A. Bodek and W. Bokhari and G. Bolla and Y. Bonushkin and D. Bortoletto",

year = "2000",

doi = "10.1103/PhysRevLett.84.835",

language = "English",

volume = "84",

pages = "835--840",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

}