The LHCb trigger and its performance in 2011
By R. Aaij, J. Albrecht, F. Alessio, S. Amato, E. Aslanides, I. Belyaev, M. Beuzekom, E. Bonaccorsi, R. Bonnefoy, L. Brarda and 73 more. 2012
870 citations recorded by the source corpus.
The LHCb trigger and its performance based on data taken at the LHC in 2011 is presented. LHCb is designed to perform flavour physics measurements, and its trigger distinguishes charm and beauty decays from the light quark background. It uses a combination of lepton identification of particles, transverse momentum of particles and selects particles originating from hadrons which decay after a finite flight distance. The trigger reduces the $\sim 11$ MHz of bunch-bunch crossings with at least one non-elastic pp-interaction to 3 kHz of events which are written to storage in two trigger levels. The first level is implemented in hardware, while the next level is a software application which runs on all processors of a large computer farm. A data driven method is used to evaluate the performance of the trigger for several charm and beauty decay modes.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/3e0dd5aee8ec4f566f62a226e119127347b67fd5
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Citations in the corpus
- Measurement of CP asymmetry in D0 → K−K+ and D0 → π−π+ decays (2014, neutral): “Then, the muon and one or two of the D 0 decay products are required to be consistent with the topological signature of b -hadron decays [16].”
- Production of J/ψ and $ \varUpsilon $ mesons in pp collisions at $ \sqrt{s}=8 $ TeV (2013, neutral): “The trigger [27] consists of a hardware stage, based on information from the calorimeter and muon systems, followed by a software stage, which applies a full event reconstruction.”
- Precision luminosity measurements at LHCb (2014, background): “The LHCb trigger system [30] consists of two separate levels: a hardware trigger, which is implemented in custom electronics, and a software trigger, executed on a farm of commercial processors.”
- Measurement of the Z+b-jet cross-section in pp collisions at s$$ \sqrt{s} $$ = 7 TeV in the forward region (2014, methodology): “The trigger consists of a hardware stage, based on information from the calorimeter and muon systems, followed by a software stage, which applies a full event reconstruction [11].”
- Measurement of the $J/\psi$ pair production cross-section in $pp$ collisions at $\sqrt{s} = 13 \,{\mathrm{TeV}}$ (2016, methodology): “The online event selection is performed by a trigger [74], which consists of a hardware stage (L0), based on information from the calorimeter and muon systems, followed by a software stage, which applies a full event reconstruction.”
- Study of J/ψ production and cold nuclear matter effects in pPb collisions at $ \sqrt{{{s_{NN }}}} $ = 5 TeV (2013, methodology): “The trigger efficiency is obtained from data using a sample of J/ψ decays unbiased by the trigger decision [17].”
- Differential branching fraction and angular analysis of the decay B0 → K∗0μ+μ− (2013, methodology): “In the second stage of the software trigger, candidates are triggered on the kinematic properties of the partially or fully reconstructed B candidate [12].”