Measurements of b-jet tagging efficiency with the ATLAS detector using t(t)over-bar events at root s=13 TeV

M. Aaboud; G. Aad; B. Abbott; O. Abdinov; B Abeloos; DK Abhayasinghe; S.H. Abidi; Ossama Sherif Alexander Abouzeid; NL Abraham; H. Abramowicz; H. Abreu; Y. Abulaiti; B.S. Acharya; Shin-ichi Adachi; L. Adamczyk; J. Adelman; M. Adersberger; A. Adiguzel; T. Adye; A. A. Affolder; Y.  Afik; Milena Bajic; Geert-Jan Besjes; Mogens Dam; Jørn Dines Hansen; Simon Holm Stark; James William Monk; Jørgen Beck Hansen; Peter Henrik Hansen; Flavia de Almeida Dias; Troels Christian Petersen; Gorm Aske Gram Krohn Galster; Fabian Alexander Jürgen Thiele; Alejandro Alonso Diaz; Graig Wiglesworth; Stefania Xella

doi:10.1007/JHEP08(2018)089

Measurements of b-jet tagging efficiency with the ATLAS detector using t(t)over-bar events at root s=13 TeV

M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B Abeloos, DK Abhayasinghe, S.H. Abidi, Ossama Sherif Alexander Abouzeid, NL Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, Shin-ichi Adachi, L. Adamczyk, J. Adelman, M. Adersberger, A. Adiguzel, T. Adye, A. A. AffolderY. Afik, Milena Bajic, Geert-Jan Besjes, Mogens Dam, Jørn Dines Hansen, Simon Holm Stark, James William Monk, Jørgen Beck Hansen, Peter Henrik Hansen, Flavia de Almeida Dias, Troels Christian Petersen, Gorm Aske Gram Krohn Galster, Fabian Alexander Jürgen Thiele, Alejandro Alonso Diaz, Graig Wiglesworth, Stefania Xella

Experimental Particle Physics

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Abstract

The efficiency to identify jets containing b-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (tt¯) selected from the 36.1 fb⁻¹ of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy s=13 TeV. Two methods are used to extract the efficiency from tt¯ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b-tagging information, is used to select events in which two b-jets are present, which reduces the dominant uncertainty in the modelling of the flavour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.

Original language	English
Article number	089
Journal	Journal of High Energy Physics
Volume	2018
Issue number	8
Number of pages	47
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP08(2018)089
Publication status	Published - 1 Aug 2018

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Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, DK., Abidi, S. H., Abouzeid, O. S. A., Abraham, NL., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adiguzel, A., Adye, T., ... Xella, S. (2018). Measurements of b-jet tagging efficiency with the ATLAS detector using t(t)over-bar events at root s=13 TeV. Journal of High Energy Physics, 2018(8), [089]. https://doi.org/10.1007/JHEP08(2018)089

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, Abouzeid, OSA, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adiguzel, A, Adye, T, Affolder, AA, Afik, Y, Bajic, M, Besjes, G-J, Dam, M , Hansen, JD, Stark, SH, Monk, JW, Hansen, JB , Hansen, PH, de Almeida Dias, F, Petersen, TC, Galster, GAGK, Thiele, FAJ, Alonso Diaz, A, Wiglesworth, G & Xella, S 2018, 'Measurements of b-jet tagging efficiency with the ATLAS detector using t(t)over-bar events at root s=13 TeV', Journal of High Energy Physics, vol. 2018, no. 8, 089. https://doi.org/10.1007/JHEP08(2018)089

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title = "Measurements of b-jet tagging efficiency with the ATLAS detector using t(t)over-bar events at root s=13 TeV",

abstract = "The efficiency to identify jets containing b-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (tt¯) selected from the 36.1 fb−1 of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy s=13 TeV. Two methods are used to extract the efficiency from tt¯ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b-tagging information, is used to select events in which two b-jets are present, which reduces the dominant uncertainty in the modelling of the flavour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.",

author = "M. Aaboud and G. Aad and B. Abbott and O. Abdinov and B Abeloos and DK Abhayasinghe and S.H. Abidi and Abouzeid, {Ossama Sherif Alexander} and NL Abraham and H. Abramowicz and H. Abreu and Y. Abulaiti and B.S. Acharya and Shin-ichi Adachi and L. Adamczyk and J. Adelman and M. Adersberger and A. Adiguzel and T. Adye and Affolder, {A. A.} and Y. Afik and Milena Bajic and Geert-Jan Besjes and Mogens Dam and Hansen, {J{\o}rn Dines} and Stark, {Simon Holm} and Monk, {James William} and Hansen, {J{\o}rgen Beck} and Hansen, {Peter Henrik} and {de Almeida Dias}, Flavia and Petersen, {Troels Christian} and Galster, {Gorm Aske Gram Krohn} and Thiele, {Fabian Alexander J{\"u}rgen} and {Alonso Diaz}, Alejandro and Graig Wiglesworth and Stefania Xella",

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AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abdinov, O.

AU - Abeloos, B

AU - Abhayasinghe, DK

AU - Abidi, S.H.

AU - Abouzeid, Ossama Sherif Alexander

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Adachi, Shin-ichi

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adiguzel, A.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Bajic, Milena

AU - Besjes, Geert-Jan

AU - Dam, Mogens

AU - Hansen, Jørn Dines

AU - Stark, Simon Holm

AU - Monk, James William

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - de Almeida Dias, Flavia

AU - Petersen, Troels Christian

AU - Galster, Gorm Aske Gram Krohn

AU - Thiele, Fabian Alexander Jürgen

AU - Alonso Diaz, Alejandro

AU - Wiglesworth, Graig

AU - Xella, Stefania

PY - 2018/8/1

Y1 - 2018/8/1

N2 - The efficiency to identify jets containing b-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (tt¯) selected from the 36.1 fb−1 of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy s=13 TeV. Two methods are used to extract the efficiency from tt¯ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b-tagging information, is used to select events in which two b-jets are present, which reduces the dominant uncertainty in the modelling of the flavour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.

AB - The efficiency to identify jets containing b-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (tt¯) selected from the 36.1 fb−1 of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy s=13 TeV. Two methods are used to extract the efficiency from tt¯ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b-tagging information, is used to select events in which two b-jets are present, which reduces the dominant uncertainty in the modelling of the flavour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.

U2 - 10.1007/JHEP08(2018)089

DO - 10.1007/JHEP08(2018)089

M3 - Journal article

SN - 1126-6708

VL - 2018

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

IS - 8

M1 - 089

ER -

Measurements of b-jet tagging efficiency with the ATLAS detector using t(t)over-bar events at root s=13 TeV

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