ATLAS b-jet identification performance and efficiency measurement with tt events in pp collisions at √ s = 13 TeV
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Springer Nature
Date
2019-11-25Referencia bibliográfica
Aad, G., Abbott, B., Abbott, D.C. et al. ATLAS b-jet identification performance and efficiency measurement with \(t{\bar{t}}\) events in pp collisions at \(\sqrt{s}=13\) TeV. Eur. Phys. J. C 79, 970 (2019).
Patrocinador
We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS,MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, The Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom;DOEandNSF,USA. In addition, individual groups andmembers have received support from BCKDF, CANARIE, CRC and Compute Canada, Canada; COST, ERC, ERDF, Horizon 2020, and Marie Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; The Royal Society and Leverhulme Trust, UK.Résumé
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.