On QCD analysis of stucture function F2γF_2^{\gamma} in alternative approach

The alternative approach to QCD analysis of the photon structure function $F_2^{\gamma}$ is presented. It differs from the conventional one by the presence of the terms which in conventional approach appear in higher orders. We show that this difference concerns also the photonic parton distribution functions. In the alternative approach, the complete LO analysis of $F_2^{\gamma}$ can be performed as all required quantities are known. At the NLO, however, one of the coefficient function is so far not available and thus only the photonic parton distribution function can be computed and compared to those of standard approach. We discuss the numerical difference of these approaches at the LO and the NLO approximation and show that in case of $F_2^{\gamma}$ this difference is non-negligible and may play an important role in the analysis on photon data of the future experiments.Comment: 25 page

Measurement of the WW Production Cross Section in Proton-Proton Collisions with the ATLAS Detector

Measurements of the W+W− production using the leptonic decay channels are analysed using data collected by the ATLAS detector at the CERN Large Hadron Collider. The precise measurement of W+W− production is important for comparing to the Standard Model expectation, and also provides a detailed understanding of this process as a background in searches for new physics phenomena