22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

LHCb trigger system

22 Jul 2010, 10:15
13m
Salle Maillot ()

Salle Maillot

Parallel Session Talk 01 - Early Experience and Results from LHC 01 - Early Experience and Results from LHC

Speaker

Eric Van Herwijnen (CERN)

Description

The Large Hadron Collider beauty experiment (LHCb) is a dedicated heavy flavour physics experiment at the LHC. The trigger system employs the finite lifetime and relative large mass of charm and beauty hadrons to distinguish heavy flavour and background from inelastic pp-scattering. The LHCb trigger is a two level system. The first level is implemented in hardware, it reduces the visible interaction rate to a maximum of 1MHz, at which the whole detector can be readout. The second trigger level is a C++ application running on an Event Filter Farm composed of several thousand CPU nodes. The full trigger is operational in the experiment. In this talk, an overview of the LHCb trigger system will be given. We put special emphasis on the experience obtained with the initial data taking at the LHC, and the commissioning and monitoring of the software trigger. The method to obtain the efficiency of the trigger from real data will be described, and first results will be presented.

Primary author

Presentation Materials