Direct measurement of A(b) and A(c) at the Z0 pole using a lepton tag

The parity violation parameters A(b) and A(c) of the Zb (b) over bar and Zc (c) over bar couplings have been measured directly, using the polar angle dependence of the Z(0)-pole polarized cross sections. Bottom and charmed hadrons were tagged via semileptonic decays. Both the muon and electron identification algorithms take advantage of new multivariate techniques, incorporating for the first time information from the SLD Cerenkov Ring Imaging Detector. Based on the 1993-1995 SLD sample of 150 000 Z(0) decays produced with highly polarized electron beams, we measure A(b) = 0.910 +/- 0.068(stat) +/- 0.037(syst), A(c) = 0.642 +/- 0.110(stat) +/- 0.063(syst)

Direct measurement of A(b) in Z(0) decays using charged kaon tagging

We present a direct measurement of the_parity-violating asymmetry Ab, in the Z0 to bb̄ coupling using a new technique to distinguish the b and b̄ quarks using charged kaons from B decays. The Z0 bosons are produced in e+e- collisions at the SLC with longitudinally polarized electrons, bb̄ events are selected using a secondary vertex mass tag and Ab is determined from the left-right forward-backward asymmetry. From the 1994-1995 data sample, selected from 100000 hadronic Z0 decays, we obtain Ab = 0.855 ± 0.088stal ± 0.102syst. © 1999 The American Physical Society

Electron performance measurements with the ATLAS detector using the 2010 LHC proton-proton collision data

Detailed measurements of the electron performance of the ATLAS detector at the LHC are reported, using decays of the Z, W and J/psi particles. Data collected in 2010 at sqrt(s)=7 TeV are used, corresponding to an integrated luminosity of almost 40 pb^-1. The inter-alignment of the inner detector and the electromagnetic calorimeter, the determination of the electron energy scale and resolution, and the performance in terms of response uniformity and linearity are discussed. The electron identification, reconstruction and trigger efficiencies, as well as the charge misidentification probability, are also presented.Comment: 34 pages plus author list (46 pages total), 24 figures, 12 tables, matches published version in EPJ