Apr 2 – 5, 2019
Jardí Botànic de València
Europe/Zurich timezone

Patatrack: accelerated Pixel Track reconstruction in CMS

Apr 2, 2019, 10:00 AM
Jardí Botànic de València

Jardí Botànic de València

Carrer Quart 80, 46008 València, Spain
Talk 6: Architectures and techniques for fast track reconstruction


Felice Pantaleo (CERN)


The upgraded CMS Pixel Tracker Detector installed during the 2016-2017 extended year-end technical stop consists of four layers in the barrel region and three disks on both sides in the forward region. This made it possible to perform a real fit on quadruplet of hits selected by a Cellular Automaton algorithm to form the pixel tracks. Pixel tracks are an important component of the CMS High-Level Trigger(HLT) reconstruction since they are also used as seeds for additional tracking iterations that make use of the full tracker information. Having a good knowledge of the parameters of the tracks allows a better cleaning and reduces the fake tracks saving CPU time. In this talk, we will describe our experience in implementing two non-iterative and multiple scattering aware fit techniques in the CMS Experiment: the Riemann Fit and Broken Line Fit. We will compare their performances against the standard Run-2 reconstruction both in terms of timing and track-parameter resolution. We will also illustrate our experience in implementing both algorithms on GPU architectures, with a particular emphasis on the engineering work that has been necessary to make the integration.

Primary authors

Marco Rovere (CERN) Vincenzo Innocente (CERN) Andrea Bocci (CERN) Matti Kortelainen (Fermi National Accelerator Lab. (US)) Felice Pantaleo (CERN) Giovanni Maria Tomaselli (INFN Sezione di Pisa, Universita' e Scuola Normale Superiore, P) Roberto Ribatti

Presentation materials