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The Supersymmetry Les Houches Accord (SLHA) [1] provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various generalisations: the minimal supersymmetric standard model with violation of CP,(More)
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when higher-order corrections are included. We propose such a scheme, Supersymmetry Parameter Analysis SPA, based on a consistent set of conventions and input parameters. A(More)
Cross-sections and angular distributions for hadronic and lepton pair final states in e+e− collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant αem, and(More)
The work contained herein constitutes a report of the “Beyond the Standard Model” working group for the Workshop “Physics at TeV Colliders”, Les Houches, France, 26 May–6 June, 2003. The research presented is original, and was performed specifically for the workshop. Tools for calculations in the minimal supersymmetric standard model are presented,(More)
Cross sections for elastic production of J/ψ mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb−1. Results are presented for photon virtualities Q2 up to 80GeV. The dependence on the photon-proton centre of mass energy Wγp is analysed in the range 40 ≤ Wγp ≤ 305GeV in(More)
The major physics motivation to construct the International Linear Collider (ILC) is summarized. The prospects for precision measurements of Higgs boson properties and Standard-Model processes as well as new physics scenarios beyond the Standard Model are given. Finally the concepts for an ultra-high-precision detector and R&D towards it are described.
A search for scalar top quarks in R–parity violating supersymmetry is performed in e+p collisions at HERA using the H1 detector. The data, taken at √ s = 319GeV and 301GeV, correspond to an integrated luminosity of 106 pb−1. The resonant production of scalar top quarks t̃ in positron quark fusion via an R–parity violating Yukawa coupling λ′ is considered(More)
Inclusive production cross sections are measured in deep inelastic scattering at HERA for meson states composed of a charm quark and a light antiquark or the charge conjugate. The measurements cover the kinematic region of photon virtuality 2 < Q2 < 100 GeV, inelasticity 0.05 < y < 0.7, D meson transverse momenta pt(D) ≥ 2.5 GeV and pseudorapidity |η(D)| ≤(More)
Measurements are presented of inclusive charm and beauty cross sections in ep collisions at HERA for values of photon virtuality 12 ≤ Q ≤ 60 GeV and of the Bjorken scaling variable 0.0002 ≤ x ≤ 0.005. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to(More)