A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using ttbar events, where one of theW bosons decays into an electron or muon and a neutrino and the other decays into a quark-antiquark pair. The measurement utilises the relatively large and known W -> cs branching ratio, which allows ameasurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at $sqrt{s} = 13$ TeV and corresponds to an integrated luminosity of 139 fb^{-1}. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and t (t) over bar decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3-17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent b-jet tagging requirement.
Measurement of the $c$-jet mistagging efficiency in $tar{t}$ events using $pp$ collision data at $sqrt{s}=13$ TeV collected with the ATLAS detector [Measurement of the c-jet mistagging efficiency in t(t)over-bar events using pp collision data at root s=13 TeV collected with the ATLAS detector] / G. Aad, B.A.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 82:1(2022 Jan 31), pp. 95.1-95.27. [10.1140/epjc/s10052-021-09843-w]
Measurement of the $c$-jet mistagging efficiency in $tar{t}$ events using $pp$ collision data at $sqrt{s}=13$ TeV collected with the ATLAS detector [Measurement of the c-jet mistagging efficiency in t(t)over-bar events using pp collision data at root s=13 TeV collected with the ATLAS detector]
A. AndreazzaMembro del Collaboration Group
;E. BallabeneMembro del Collaboration Group
;A. CarboneMembro del Collaboration Group
;L. Carminati;S. D’AuriaMembro del Collaboration Group
;L. Dell'Asta;M. FantiMembro del Collaboration Group
;M. LazzaroniMembro del Collaboration Group
;C. MeroniMembro del Collaboration Group
;D.P. MungoMembro del Collaboration Group
;A. MurroneMembro del Collaboration Group
;L. PeriniMembro del Collaboration Group
;F. PiazzaMembro del Collaboration Group
;F. RagusaMembro del Collaboration Group
;A. StabileMembro del Collaboration Group
;
2022
Abstract
A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using ttbar events, where one of theW bosons decays into an electron or muon and a neutrino and the other decays into a quark-antiquark pair. The measurement utilises the relatively large and known W -> cs branching ratio, which allows ameasurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at $sqrt{s} = 13$ TeV and corresponds to an integrated luminosity of 139 fb^{-1}. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and t (t) over bar decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3-17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent b-jet tagging requirement.| File | Dimensione | Formato | |
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Aad2022_Article_MeasurementOfTheC-jetMistaggin.pdf
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