[PAST EVENT] Physics Seminar

November 7, 2011
2:30pm - 3:30pm
Small Hall, Conference Room 122
300 Ukrop Way
Williamsburg, VA 23185Map this location
Abstract: In 2010 and 2011 the ATLAS experiment has successfully recorded data from LHC collisions with high efficiency and excellent data quality. ATLAS employs a three-level trigger system to select events of interest for physics analyses and detector commissioning. The trigger system consists of a custom-designed hardware trigger at level-1 (L1) and software algorithms executing on commodity servers at the two higher levels. The trigger selection is defined by trigger menus which consist of more than 500 individual trigger signatures, such as
electrons, muons, particle jets, etc. A composition of a deployed trigger menu depends on instantaneous LHC luminosity, experiment's goals for recorded data and limits imposed by the available computing power, network bandwidth and storage space. In this talk I will describe a design of ATLAS trigger system and operational experience with the system as the LHC luminosity increased by 6 orders of magnitude.

LHC has already delivered more than 2fb^-1 at 7TeV pp center of mass energy, with more data to come. These data allows us to make precise measurements of the Standard Model physics, expand searches for the Higgs boson and look for new physics phenomena. This talk will overview Higgs analyses on ATLAS, with an emphasis on two leptons final states where Higgs decays to WW boson pair.