Two-jet mass distributions at the CERN proton-antiproton collider

Two-jet mass distributions have been measured as a function of centre-of-mass scattering angle for high-mass jet pairs produced in proton-antiproton collisions at the CERN collider operating at a centre-of-mass energy of 630 GeV. The agreement between QCD expectations and the experimental measurements has been used to place limits on the production cross section of an object X decaying into two jets. In particular we consider the existence of a massive colour octet of vector gauge bosons (axigluons). We exclude axigluons with a width ΛA < 0.4mA and a mass mA in the range 150 < mA < 310 GeV/c2 (95% CL). © 1988

Beauty production at the CERN proton-antiproton collider

We report evidence for beauty particle production through the observation of dimuon events from proton-antiproton collisions at energies of s=546 GeV and s=630 GeV at the CERN collider. Our data indicate that semi-leptonic decays of beauty particles are the dominant source of pairs of high-pT muons. The beauty flavour creation (gg or qq→bb) cross-section needed to explain the dimuon rate is σ{pp→bb+X; pb T>5 GeV/c, |η|<2.0}=(1.1±0.1±0.4) μb, which is in good agreement with QCD calculations. We also observe clear signals for γ→μ+μ- (hidden beauty) and high-pTJ/Ψ→μ+μ-, well above the backgraound of continuum muon pairs from the Drell-Yan mechanism. © 1987