162 research outputs found

    Measurement of the top quark mass in the alljets channel.

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    The top quark, the upper quark of the third fermion family, was discovered by CDF and DO collaborations at Fermilab Tevatron collider in 1995. Both, CDF and DO experiments measured the top quark properties, tt production cross section and top quark mass mass, in various decay channels. This thesis describes the measurement of the top quark mass in alljets final states using data collected by the DO detector during Run I in 1992 - 1996. The alljets channel has, compared to other tt decay modes, large branching ratio but it is characteristic by enormous QCD background. Both top quarks decay to the b quark and W boson, and both W bosons then decay to quarks forming fully hadronic final states. Such events thus should contain only jets with no isolated leptons.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

    Top quark production at D0

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    利子の形成について(上)

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    The lifetime of the B0 s meson is measured in the decay channel B0 s → J=ψπþπ− with 880 ≤ Mπþπ− ≤ 1080 MeV=c2, which is mainly a CP-odd state and dominated by the f0ð980Þ resonance. In 10.4 fb−1 of data collected with the D0 detector in Run II of the Tevatron, the lifetime of the B0 s meson is measured to be τðB0 s Þ ¼ 1.70 0.14ðstatÞ 0.05ðsystÞ ps. Neglecting CP violation in B0 s=B¯ 0 s mixing, the measurement can be translated into the width of the heavy mass eigenstate of the B0 s , ΓH ¼ 0.59 0.05ðstatÞ 0.02ðsystÞ ps−1. D

    Measurement of the W+bW+b-jet and W+cW+c-jet differential production cross sections in ppˉp\bar{p} collisions at s=1.96\sqrt{s}=1.96 TeV

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    We present a measurement of the cross sections for the associated production of a WW boson with at least one heavy quark jet, bb or cc, in proton-antiproton collisions. Data corresponding to an integrated luminosity of 8.7 fb1^{-1} recorded with the D0 detector at the Fermilab Tevatron \ppbar Collider at s=1.96\sqrt{s}=1.96 TeV are used to measure the cross sections differentially as a function of the jet transverse momenta in the range 20 to 150 GeV. These results are compared to calculations of perturbative QCD theory as well as predictions from Monte Carlo generators.We present a measurement of the cross sections for the associated production of a WW boson with at least one heavy quark jet, bb or cc, in proton-antiproton collisions. Data corresponding to an integrated luminosity of 8.7 fb1^{-1} recorded with the D0 detector at the Fermilab Tevatron \ppbar Collider at s=1.96\sqrt{s}=1.96 TeV are used to measure the cross sections differentially as a function of the jet transverse momenta in the range 20 to 150 GeV. These results are compared to calculations of perturbative QCD theory as well as predictions from Monte Carlo generators.We present a measurement of the cross sections for the associated production of a W boson with at least one heavy quark jet, b or c , in proton–antiproton collisions. Data corresponding to an integrated luminosity of 8.7 fb−1 recorded with the D0 detector at the Fermilab Tevatron pp¯ Collider at s=1.96 TeV are used to measure the cross sections differentially as a function of the jet transverse momenta in the range 20 to 150 GeV. These results are compared to calculations of perturbative QCD theory as well as predictions from Monte Carlo generators
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