Eur. Phys. J. C (2006) 46: 605-667
https://doi.org/10.1140/epjc/s2006-02495-8
https://doi.org/10.1140/epjc/s2006-02495-8
Experimental Physics
The CMS high level trigger
Received:
2
September
2005
Published online:
12
April
2006
At the Large Hadron Collider at CERN the proton bunches cross at a rate of 40 MHz. At the Compact Muon Solenoid experiment the original collision rate is reduced by a factor of 
(1000) using a Level-1 hardware trigger. A subsequent factor of (1000) data reduction is obtained by a software-implemented high level trigger (HLT) selection that is executed on a multi-processor farm. In this review we present in detail prototype CMS HLT physics selection algorithms, expected trigger rates and trigger performance in terms of both physics efficiency and timing.
© Springer-Verlag, 2006
