IV. High Pt Detector and Physics (cont.)
The CMS trigger system
Imperial College of Science Technology and Medicine, London SW7, UK
Accepted: 4 August 2003
Published online: 13 July 2004
The CMS trigger system must reduce an input data rate from the LHC bunch-crossing frequency of 40 MHz to a rate which will be written to permanent storage. A detailed study has recently been made of the performance of this system. This paper presents key elements of the results obtained and gives details of a draft “trigger table” for the Level-1 Trigger and the High-Level Trigger selection at a “start-up” luminosity of 2× 1033 cm – 2s – 1. High efficiencies for most physics objects are attainable with a selection that remains inclusive and avoids detailed topological or other requirements on the event.
© Società Italiana di Fisica, Springer-Verlag, 2004