Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector

Philip James Clark; Sinead Farrington; Michele Faucci Giannelli; Yanyan Gao; Ahmed Hasib; Christos Leonidopoulos; Victoria Jane Martin; Liza Mijović; Corrinne Mills; Benjamin Wynne; Atlas Collaboration

doi:10.1016/j.physletb.2018.03.023

Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector

Philip James Clark, Sinead Farrington, Michele Faucci Giannelli, Yanyan Gao, Ahmed Hasib, Christos Leonidopoulos, Victoria Jane Martin, Liza Mijović, Corrinne Mills, Benjamin Wynne, Atlas Collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

The production of a top quark in association with a $Z$ boson is investigated. The proton--proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} = 13 \mathrm{TeV}$ are used, corresponding to an integrated luminosity of $36.1 \mathrm{fb}^{-1}$. Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a $b$-quark jet are selected. The major backgrounds are diboson, $t\bar{t}$ and $Z\mathrm{+jets}$ production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is $4.2\sigma$ in the data and the expected significance is $5.4\sigma$. The measured cross-section for $tZq$ production is $600 \pm 170 \mathrm{(stat.)} \pm 140 \mathrm{(syst.)} \mathrm{fb}$.

Original language	English
Article number	557-577
Journal	Physics Letters B
Volume	B780
DOIs	https://doi.org/10.1016/j.physletb.2018.03.023
Publication status	Published - 10 May 2018

Access to Document

10.1016/j.physletb.2018.03.023

http://repo.scoap3.org/record/24360/files/main.pdfFinal published version, 1.49 MB

Cite this

Clark, P. J., Farrington, S., Faucci Giannelli, M., Gao, Y., Hasib, A., Leonidopoulos, C., Martin, V. J., Mijović, L., Mills, C., Wynne, B., & Collaboration, A. (2018). Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector. Physics Letters B, B780, Article 557-577. https://doi.org/10.1016/j.physletb.2018.03.023

@article{25bc4be451a542e08f84206756105c58,

title = "Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector",

abstract = "The production of a top quark in association with a $Z$ boson is investigated. The proton--proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} = 13 \mathrm{TeV}$ are used, corresponding to an integrated luminosity of $36.1 \mathrm{fb}^{-1}$. Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a $b$-quark jet are selected. The major backgrounds are diboson, $t\bar{t}$ and $Z\mathrm{+jets}$ production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is $4.2\sigma$ in the data and the expected significance is $5.4\sigma$. The measured cross-section for $tZq$ production is $600 \pm 170 \mathrm{(stat.)} \pm 140 \mathrm{(syst.)} \mathrm{fb}$.",

author = "Clark, {Philip James} and Sinead Farrington and {Faucci Giannelli}, Michele and Yanyan Gao and Ahmed Hasib and Christos Leonidopoulos and Martin, {Victoria Jane} and Liza Mijovi{\'c} and Corrinne Mills and Benjamin Wynne and Atlas Collaboration",

year = "2018",

month = may,

day = "10",

doi = "10.1016/j.physletb.2018.03.023",

language = "English",

volume = "B780",

journal = "Physics Letters B",

issn = "1873-2445",

publisher = "Elsevier",

}

Clark, PJ , Farrington, S, Faucci Giannelli, M, Gao, Y, Hasib, A, Leonidopoulos, C , Martin, VJ , Mijović, L, Mills, C, Wynne, B & Collaboration, A 2018, 'Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector', Physics Letters B, vol. B780, 557-577. https://doi.org/10.1016/j.physletb.2018.03.023

TY - JOUR

T1 - Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector

AU - Clark, Philip James

AU - Farrington, Sinead

AU - Faucci Giannelli, Michele

AU - Gao, Yanyan

AU - Hasib, Ahmed

AU - Leonidopoulos, Christos

AU - Martin, Victoria Jane

AU - Mijović, Liza

AU - Mills, Corrinne

AU - Wynne, Benjamin

AU - Collaboration, Atlas

PY - 2018/5/10

Y1 - 2018/5/10

N2 - The production of a top quark in association with a $Z$ boson is investigated. The proton--proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} = 13 \mathrm{TeV}$ are used, corresponding to an integrated luminosity of $36.1 \mathrm{fb}^{-1}$. Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a $b$-quark jet are selected. The major backgrounds are diboson, $t\bar{t}$ and $Z\mathrm{+jets}$ production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is $4.2\sigma$ in the data and the expected significance is $5.4\sigma$. The measured cross-section for $tZq$ production is $600 \pm 170 \mathrm{(stat.)} \pm 140 \mathrm{(syst.)} \mathrm{fb}$.

AB - The production of a top quark in association with a $Z$ boson is investigated. The proton--proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} = 13 \mathrm{TeV}$ are used, corresponding to an integrated luminosity of $36.1 \mathrm{fb}^{-1}$. Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a $b$-quark jet are selected. The major backgrounds are diboson, $t\bar{t}$ and $Z\mathrm{+jets}$ production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is $4.2\sigma$ in the data and the expected significance is $5.4\sigma$. The measured cross-section for $tZq$ production is $600 \pm 170 \mathrm{(stat.)} \pm 140 \mathrm{(syst.)} \mathrm{fb}$.

U2 - 10.1016/j.physletb.2018.03.023

DO - 10.1016/j.physletb.2018.03.023

M3 - Article

SN - 1873-2445

VL - B780

JO - Physics Letters B

JF - Physics Letters B

M1 - 557-577

ER -

Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector

Abstract / Description of output

Access to Document

Fingerprint

Cite this