Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking - INSPIRE

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Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking

ATLAS

Collaboration

May 19, 2020

53 pages

Published in:

JHEP 08 (2020) 080

Published: Aug 19, 2020

e-Print:

2005.09554 [hep-ex]

DOI:

10.1007/JHEP08(2020)080

Report number:

CERN-EP-2020-050

Experiments:

CERN-LHC-ATLAS

View in:

reference search139 citations

Citations per year

Abstract: (Springer)

The factor of four increase in the LHC luminosity, from 0.5 × 10

^{34}

cm

^{−2}

s

^{−1}

to 2.0 × 10

^{34}

cm

^{−2}

s

^{−1}

, and the corresponding increase in pile-up collisions during the 2015–2018 data-taking period, presented a challenge for the ATLAS trigger, particularly for those algorithms that select events with missing transverse momentum. The output data rate at fixed threshold typically increases exponentially with the number of pile-up collisions, so the legacy algorithms from previous LHC data-taking periods had to be tuned and new approaches developed to maintain the high trigger efficiency achieved in earlier operations. A study of the trigger performance and comparisons with simulations show that these changes resulted in event selection efficiencies of > 98% for this period, meeting and in some cases exceeding the performance of similar triggers in earlier run periods, while at the same time keeping the necessary bandwidth within acceptable limits.[graphic not available: see fulltext]

Note:

53 pages in total, author list starting page 37, 14 figures, 3 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TRIG-2019-01/

Hadron-Hadron scattering (experiments)
p p: scattering
p p: colliding beams
Z0: leptonic decay
muon: pair production
transverse momentum: missing-energy
trigger: performance
transverse momentum: trigger
trigger: efficiency
CERN LHC Coll

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