We review the results on representing the differential cross section for W-pair production, includingW decay and hard-photon bremsstrahlung, in terms of a Bornform approximation of fairly simple analytic form. The results of the Born-form approximation are compared with full-one-loop results. The emphasis is on the energy range of future e+e− (or μ+μ−) colliders. LC-TH-2000-018 BI-TP 2000/05 he...

The connection between the present density of neutralinos that are left over from the Big Bang and the superparticle mass scale is briefly reviewed. Superparticle mass scales in the range from a few GeV to several TeV can lead to an acceptable density of thermal relic neutralinos, the actual value depending on relations between the masses of certain sparticles and Higgs bosons. To appear in the...

This note describes a study on the momentum resolution of the TPC-based central tracker design which will be included in the ECFA/DESY conceptual design report (CDR) for the proposed DESY 500 GeV electron-positron linear collider. The study found it to be likely that the central tracker could achieve a momentum resolution of approximately 10 −4 (GeV/c) −1 , particularly if a layer of silicon mi...

One of the options considered for the ECFA-CERNNuPECC design study for a Large Hadron electron Collider (LHeC) [1] based on the LHC is adding a recirculating energy-recovery linac tangential to the LHC. First designs of the electron Final Focus System have shown the need to correct the chromatic aberrations. Two designs using different approaches for the chromaticity correction are compared, na...

The passage of the Excellent Care for All Act, 2010 (ECFA Act) in Ontario has confirmed the responsibilities of hospital boards for quality of care and reinforced expectations that they will monitor performance and establish strategic aims in this area. Quality of care and patient safety have created a new agenda for many healthcare boards that had only a limited focus on these issues. Here, we...

ATP-binding cassette (ABC) transporters mediate transport of diverse substrates across membranes. We have determined the quaternary structure and functional unit of the recently discovered ECF-type (energy coupling factor) of ABC transporters, which is widespread among prokaryotes. ECF transporters are protein complexes consisting of a conserved energizing module (two peripheral ATPases and the...

In this manuscript, I give a short summary on scenarios with new physics scalars that could be investigated at future e+e? colliders. concentrate cases where least one of the additional has mass below 125 GeV, and discuss both models realized, as well studies which focus such scenarios. This work is based several overview talks recently gave CEPC workshop, FCC week ECFA collider Snowmass White ...

We study pair production of leptoquarks in ee annihilation at linear colliders. A detailed simulation including beamstrahlung and initial state radiation, leptoquark decay and hadronization, as well as detector smearing, is performed. Discovery limits are estimated for center-of-mass energies of 500 and 800 GeV. The prospects for determining masses and couplings of leptoquarks are also investig...

We review the features of top-quark decays and loop-induced effects in the production cross section and CP-violating observables of e+e− → tt̄ which are specific to the R-parity conserving Minimal Supersymmetric Standard Model (MSSM). Contribution to the proceedings of the 2nd Joint ECFA/DESY Workshop on Physics and Detectors for a Linear Electron-Positron Collider, based on talks presented by J...

For the next generation of linear colliders, the energy loss due to beamstruhlung during the collision of the e+ebeams is expected to substantially influence the effective center-of-mass energy distribution of the colliding particles. In this paper, we first derive analytical formulae for the electron and photon energy spectra under multiple beamstrahlung processes, and for the e+eand +yr diffe...