ATLAS

Abstract:

The cooling system of a large scale silicon detector system is critical for the long term operation of detectors in the harsh radiation environment of the LHC. The ATLAS and CMS experiments have developed and commissioned their large and complex distributed systems over the last few years. The systems are now complete and are in operation. In this publication I will describe the ATLAS and CMS systems and summarise some of the experience gained in the development and operation of these systems.

Abstract:

Direct measurements of the proton structure function FL have been performed in deep inelastic ep scattering at low x at HERA. The FL values are extracted by the H1 and ZEUS collaborations from the cross sections measured at fixed x and Q2 but different y values. This is achieved by using data sets collected with three different proton beam energies. The H1 and ZEUS results are consistent with each other and exhibit a non-zero FL. The measurements are also consistent with the previous indirect determinations of FL by H1. The results confirm DGLAP NLO and NNLO QCD predictions for FL(x,Q2), derived from previous HERA data, which are dominated by a large gluon density at low x.

Abstract:

EURECA (European Underground Rare Event Calorimeter Array) is an astro-particle physics facility aiming to directly detect galactic dark matter. The Laboratoire Souterrain de Modane has been selected as host laboratory. The EURECA collaboration unites CRESST, EDELWEISS and the Spanish-French experiment ROSEBUD, thus concentrating and focussing effort on cryogenic detector research in Europe into a single facility. EURECA will use a target mass of up to one ton, enough to explore WIMP - nucleon scalar scattering cross sections in the region of 10^-9 - 10^-10 picobarn. A major advantage of EURECA is the planned use of more than just one target material (multi target experiment for WIMP identification). © EAS, EDP Sciences 2009.

Abstract:

We provide an assessment of the state of the art in various issues related to experimental measurements, phenomenological methods and theoretical results relevant for the determination of parton distribution functions (PDFs) and their uncertainties, with the specific aim of providing benchmarks of different existing approaches and results in view of their application to physics at the LHC. We discuss higher order corrections, we review and compare different approaches to small x resummation, and we assess the possible relevance of parton saturation in the determination of PDFS at HERA and its possible study in LHC processes. We provide various benchmarks of PDF fits, with the specific aim of studying issues of error propagation, non-gaussian uncertainties, choice of functional forms of PDFs, and combination of data from different experiments and different processes. We study the impact of combined HERA (ZEUS-H1) structure function data, their impact on PDF uncertainties, and their implications for the computation of standard candle processes, and we review the recent F L determination at HERA. Finally, we compare and assess methods for luminosity measurements at the LHC and the impact of PDFs on them.