20th International Conference on Computing in High Energy and Nuclear Physics (CHEP2013)

The CMS High Level Trigger

17 Oct 2013, 11:00

20m

Verwey Kamer (Amsterdam, Beurs van Berlage)

Oral presentation to parallel session Data acquisition, trigger and controls Data Acquisition, Trigger and Controls

Speaker

Daniele Trocino (Northeastern University (US))

Description

The CMS experiment has been designed with a 2-level trigger system: the Level 1 Trigger, implemented on custom-designed electronics, and the High Level Trigger (HLT), a streamlined version of the CMS offline reconstruction software running on a computer farm. A software trigger system requires a tradeoff between the complexity of the algorithms running on the available computing power, the sustainable output rate, and the selection efficiency. Here we will present the performance of the main triggers used during the 2012 data taking, ranging from simpler single-object selections to more complex algorithms combining different objects, and applying analysis-level reconstruction and selection. We will discuss the optimisation of the triggers and the specific techniques to cope with the increasing LHC pile-up, reducing its impact on the physics performance.

Presentation materials

Slides

2013-10-17_CMSHLT_Trocino.pdf