[en] The measurement of the top quark pair production cross section in proton-antiproton collisions at √s = 1.96 TeV is a test of quantum chromodynamics and could potentially be sensitive to new physics beyond the standard model. The author reports on the latest t(bar t) cross section results from the CDF and D0 experiments in various final state topologies which arise from decays of top quark pairs

[en] The authors present a measurement of the B_s⁰ meson lifetime using fully and partially reconstructed hadronic decays B_s⁰ → D_s^- π⁺(X) followed by D_s^- → φπ^-. The data sample was recorded with the CDF II detector at the Fermilab Tevatron and corresponds to an integrated luminosity of 1.3 fb^-1 from p(bar p) collisions at √s = 1.96 TeV

[en] The CDF and D0 collaborations have updated their measurements of the mass of the top quark using proton-antiproton collisions at √s = 1.96 TeV produced at the Tevatron. The uncertainties in each of the top-antitop decay channels have been reduced. The new Tevatron average for the mass of the top quark based on about 1 fb^-1 of data per experiment is 170.9 ± 1.8 GeV/c²

[en] Measuring the angle γ is an important part of over-constraining the Unitarity Triangle to test Standard Model predictions. There are a number of methods to measure γ, and we present results on the progress made in measuring γ with B meson decays, using data collected with the BABAR detector at the PEP-II asymmetric energy e⁺e^- collider at SLAC

[en] Over the last 20 years many labs started to use Allison scanners to measure loW--energy ion beam emittances. We show that large trajectory angles produce ghost signals due to the impact of the beamlet on the electric deflection plates. The strength of the ghost signal is proportional to the amount of beam entering the scanner. Depending on the ions and their velocity, ghost signals can have the opposite polarity as the main beam signals or the same polarity. These ghost signals are easily overlooked because they partly overlap the real signals, they are mostly below the 1% level, and they are often hidden in the noise. However, they cause significant errors in emittance estimates because they are associated with large trajectory angles. The strength of ghost signals, and the associated errors, can be drastically reduced with a simple modification of the deflection plates

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[en] A measurement of the top quark mass in t(bar t) → l + jets candidate events, obtained from p(bar p) collisions at √s = 1.96 TeV at the Fermilab Tevatron using the CDF II detector, is presented. The measurement approach is that of a matrix element method. For each candidate event, a two dimensional likelihood is calculated in the top pole mass and a constant scale factor, 'JES', where JES multiplies the input particle jet momenta and is designed to account for the systematic uncertainty of the jet momentum reconstruction. As with all matrix elements techniques, the method involves an integration using the Standard Model matrix element for tt production and decay. however, the technique presented is unique in that the matrix element is modified to compensate for kinematic assumptions which are made to reduce computation time. Background events are dealt with through use of an event observable which distinguishes signal from background, as well as through a cut on the value of an event's maximum likelihood. Results are based on a 955 pb^-1 data sample, using events with a high-p_T lepton and exactly four high-energy jets, at least one of which is tagged as coming from a b quark; 149 events pass all the selection requirements. They find M_meas = 169.8 ± 2.3(stat.) ± 1.4(syst.) GeV/c²

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[en] The Damping Rings for the International Linear Collider have challenging requirements for the acceptance, because of the high average injected beam power and the large beam produced from the positron source. At the same time, the luminosity goals mean that the natural emittance must be very small, and this makes it particularly difficult to achieve a good dynamic aperture. We describe design approaches and lattice designs that meet the emittance specification and have very promising dynamic aperture