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. Andreazza
Membro del Collaboration Group
;
E. Ballabene
Membro del Collaboration Group
;
A. Carbone
Membro del Collaboration Group
;
L. Carminati;S. D’Auria
Membro del Collaboration Group
;
L. Dell'Asta;M. Fanti
Membro del Collaboration Group
;
M. Lazzaroni
Membro del Collaboration Group
;
C. Meroni
Membro del Collaboration Group
;
D.P. Mungo
Membro del Collaboration Group
;
A. Murrone
Membro del Collaboration Group
;
L. Perini
Membro del Collaboration Group
;
F. Piazza
Membro del Collaboration Group
;
F. Ragusa
Membro del Collaboration Group
;
A. Stabile
Membro 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.
Settore FIS/01 - Fisica Sperimentale
Settore ING-INF/07 - Misure Elettriche e Elettroniche
31-gen-2022
Article (author)
File in questo prodotto:
File Dimensione Formato  
Aad2022_Article_MeasurementOfTheC-jetMistaggin.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Licenza: Creative commons
Dimensione 4.68 MB
Formato Adobe PDF
4.68 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/907762
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 104
  • ???jsp.display-item.citation.isi??? 105
  • OpenAlex ND
social impact