ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at s√=13 TeV

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dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbbott, D.C.
dc.contributor.authorAbed Abud, A.
dc.contributor.authorAbeling, K.
dc.contributor.authorAbhayasinghe, D.K.
dc.contributor.authorAbidi, S.H.
dc.contributor.authorAbouZeid, O.S.
dc.contributor.authorAbraham, N.L.
dc.contributor.authorAbramowicz, H.
dc.contributor.authorAlbert, Justin
dc.contributor.authorAnelli, Christopher R.
dc.contributor.authorChiu, Y. H.
dc.contributor.authorGhasemi Bostanabad, M.
dc.contributor.authorHamano, Kenji
dc.contributor.authorHill, Ewan Chin
dc.contributor.authorKay, E. F.
dc.contributor.authorKeeler, Richard
dc.contributor.authorKowalewski, Robert
dc.contributor.authoret al.
dc.date.accessioned2020-11-10T19:03:43Z
dc.date.available2020-11-10T19:03:43Z
dc.date.copyright2019en_US
dc.date.issued2019
dc.description.abstractThe 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.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. 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. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFNCNAF (Italy), NL-T1 (The Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Refen_US
dc.identifier.citationAad, G., Abbott, B., Abbott, D. C., Abed Abud, A., Abeling, K., Abhayasinghe, D. K., … Zwalinski, L. (2019). ATLAS b-jet identification performance and efficiency measurement with tt events in pp collisions at s√=13TeV. The European Physical Journal C, 79(11). https://doi.org/10.1140/epjc/s10052-019-7450-8en_US
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-019-7450-8
dc.identifier.urihttp://hdl.handle.net/1828/12335
dc.language.isoenen_US
dc.publisherThe European Physical Journal Cen_US
dc.subject.departmentDepartment of Physics and Astronomy
dc.titleATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at s√=13 TeVen_US
dc.typeArticleen_US

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