Exploring Little Higgs models with ATLAS at the LHC-

The European Physical Journal C - We discuss possible searches for the new particles predicted by Little Higgs Models at the LHC. By using a simulation of the ATLAS detector, we demonstrate how the...     

Measurement of the hadronic decay current in τ?→π??+vτ

The properties of hadronic Z⁰ decays with final state photons, measured with OPAL at LEP, have been compared with predictions from two different matrix element calculations ofO( _s ). Two calculations, GNJETS and EEPRAD, have been investigated which use different schemes to restrict the phase space around the poles of the cross section. Assuming the E0-JADE jet definition, both calculations describe the data well in large regions of phase space fory _cut values around 0.06. For very large and very small jet-photon masses some deviations from the predictions have been found, indicating the importance of higher order corrections. Significant differences between the calculations are only apparent in the predicted rate of 1-jet plus photon events. The rate is higher in GNJETS which reproduces the data better than EEPRAD.     

Prospects for the search for a standard model Higgs boson in ATLAS using vector boson fusion

The European Physical Journal C - The potential for the discovery of a Standard Model Higgs boson in the mass range m H < 2 m Z in the vector boson fusion mode has been studied for the ATLAS...     

New fermions at e+e− colliders II. Signals and backgrounds

We discuss the production, at high-energye ⁺ e ^– linear colliders, of new heavy fermions predicted by extensions of the Standard Model. We analyze in great details the various signals and the corresponding backgrounds for both pair production and single production in association with ordinary fermions. Concentrating on new leptons, we use a model detector fore ⁺ e ^– collisions at a center of mass energy of 500 GeV, to illustrate the discovery potential of the next linear colliders.     

Inclusive neutral vector meson production in hadronicZ0 decays

Results are reported of a study of neutral vector meson production in multihadronicZ ⁰ decays in the OPAL experiment at LEP. Pions and kaons have been identified by specific ionisation energy loss andK ^± andK ⁺ K ^– mass spectra have been fitted, in bins of the scaled momentum variablex _p , to combinations of resonance signals and non-resonant backgrounds. Rates are given forK ^*(892)° and ø(1020), and production cross sections are compared to the predictions of Monte Carlo models. Overall multiplicities have been determined as 0.76±0.07±0.06K ^*(892)° and 0.086±0.015±0.010 ø(1020) per hadronicZ ⁰ decay (the quoted errors are respectively statistical and systematic). Momentum dependent distortions of the mass spectra, possibly associated indirectly with Bose-Einstein effects, have prevented reliable measurement of the (770)° cross section in this study.