Performance of the proposed fast track processor for rare decays at the ATLAS experiment

Erik Brubaker*, Catalin Ciobanu, Francesco Crescioli, Monica Dunford, Paola Giannetti, Young Kee Kim, Tony Liss, Mauro Dell'Orso, Giovanni Punzi, Mel Shochet, Giulio Usai, Iacopo Vivarelli, Guido Volpi, Kohei Yorita

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The Fast Track processor (FTK) has been proposed for high-quality track finding at very high rates (Level-1 output rates) for the LHC experiments. Fast, efficient and precise pattern recognition has been studied using a silicon 7-layer sub-detector, including a subset of the pixel and SCT layers. We tested the FTK algorithms using the ATLAS full simulation. We compare the FTK reconstruction quality with the tracking capability of the offline iPatRec algorithm. We show that similar resolutions and efficiencies are reached by FTK at a speed higher than iPatRec by orders of magnitude. With FTK full events are reconstructed at the Level-1 output rate. Bs0 → μ+μ- events are fully simulated together with background samples. We show that a low Level-2 rate is allowed by FTK, even using a single 6 GeV Level-1 muon selection trigger. FTK provides the full-resolution track list ready for the Level-2 Bs0 identification. All selection cuts performed by the Event Filter can be easily anticipated at Level-2. We present the Bs0 → μ+μ- efficiency gain and related Level-2 rates.

Original languageEnglish
Pages (from-to)145-150
Number of pages6
JournalIEEE Transactions on Nuclear Science
Issue number1
Publication statusPublished - 2008 Feb
Externally publishedYes


  • FTK
  • Fast track
  • Trigger

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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