Search for long-lived neutral particles produced in $pp$ collisions at $\sqrt{s} = 13$ TeV decaying into displaced hadronic jets in the ATLAS inner detector and muon spectrometer
ArXiv 1911.12575 (2019)
Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
ArXiv 1911.12606 (2019)
ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at s√=13 TeV
European Physical Journal C: Particles and Fields Springer 79:11 (2019) 970
Abstract:
The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b-hadrons is measured in collision data. The measurement uses a likelihood-based method in a sample highly enriched in tt¯ events. The topology of the t→Wb decays is exploited to simultaneously measure both the jet flavour composition of the sample and the efficiency in a transverse momentum range from 20 to 600 GeV. The efficiency measurement is subsequently compared with that predicted by the simulation. The data used in this measurement, corresponding to a total integrated luminosity of 80.5 fb−1, were collected in proton–proton collisions during the years 2015–2017 at a centre-of-mass energy s√= 13 TeV. By simultaneously extracting both the efficiency and jet flavour composition, this measurement significantly improves the precision compared to previous results, with uncertainties ranging from 1 to 8% depending on the jet transverse momentum.Search for direct stau production in events with two hadronic $τ$-leptons in $\sqrt{s} = 13$ TeV $pp$ collisions with the ATLAS detector
ArXiv 1911.0666 (2019)
ATLAS data quality operations and performance for 2015-2018 data-taking
ArXiv 1911.04632 (2019)