ATLAS

Abstract:

At HERA heavy quarks may contribute up to 30% of the structure function F2. The potential of including heavy-quark data in the ZEUS PDF fits is explored, using D* double dierential cross-sections as well as the inclusive quantities Fcc2 , Fcc2 . The introduction of heavy quarks requires an extension of the DGLAP formalism. The effect of using different heavy avour number schemes, and different approaches to the running of αs, are compared.

Abstract:

High precision magnetometry is an essential requirement of the cryoEDM experiment at the Institut Laue-Langevin, Grenoble. We have developed a SQUID system for this purpose, however tests done in Oxford have been limited by the noisy electromagnetic environment inside our laboratory, therefore we have tested a smaller version of our prototype system in the very low noise environment at LSBB, Rustrel, France. We have studied the crosstalk between an array of parallel pick-up loops - where the field generated by a current in one loop is detected by the others. We monitored the magnetic field in the LSBB for over twelve hours; and after correcting these data for SQUID resets, and crosstalk, we compare it to the published values from nearby geomagnetic observatories. We have also measured the noise spectrum of our system and studied the effect that heating one of the pick-up loops into its conducting state has on the other, parallel loops. © 2008 IOP Publishing Ltd and SISSA.

Abstract:

The Standard Model of particle physics has a number of asymmetries suggestive of a more fundamental theory, where the symmetries are restored. If the symmetry breaking scale is the electroweak scale, new Higgs bosons beyond that of the Standard Model could be observed at the Tevatron. Recent Tevatron searches have set the most stringent limits on new Higgs bosons in a variety of models.

Abstract:

A wide array of deep-inelastic-scattering and hadron collider experiments have tested the predictions of the electroweak theory and measured its parameters, while also searching for new particles and processes. We summarise recent measurements and searches that probe the Standard Model to unprecedented precision.

Abstract:

Supersymmetry predicts a range of new phenomena with a variety of experimental signatures. Searches for supersymmetry at the Fermilab Tevatron accelerator fall into three broad categories: generic sparticle searches; specialized searches for sparticles with unusual properties; and model-independent searches probing for discrepancies between the data and the standard model. Searches performed by the CDF and D0 experiments with up to 2 fb^-1 of √ s = 1.96 TeVpp data have yet to turn up any evidence for supersymmetry. © 2008 American Institute of Physics.