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Title: Observation of the associated production of a top quark and a Z boson in pp collisions at $$ \sqrt{s} $$= 13 TeV with the ATLAS detector

Abstract

Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 fb-1. Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a b-hadron, are selected. The main backgrounds are from $$t\bar{t}Z$$ and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for tℓ+ℓ-q production, including non-resonant dilepton pairs with mℓ+ℓ-> 30 GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction.

Authors:
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Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Oklahoma, Norman, OK (United States); Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
ATLAS Collaboration; The ATLAS collaboration
OSTI Identifier:
1650116
Alternate Identifier(s):
OSTI ID: 1656781; OSTI ID: 1690239; OSTI ID: 1776584
Grant/Contract Number:  
AC02-05CH11231; SC0009956; SC0007881
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2020; Journal Issue: 7; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Hadron-Hadron scattering experiments; Hadron-Hadron scattering (experiments)

Citation Formats

Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adachi, S, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adersberger, M, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alshehri, AA, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, CF, Anders, JK, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aperio Bella, L, Araque, JP, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, and Arce, ATH. Observation of the associated production of a top quark and a Z boson in pp collisions at $ \sqrt{s} $= 13 TeV with the ATLAS detector. United States: N. p., 2020. Web. doi:10.1007/JHEP07(2020)124.
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Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adachi, S, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adersberger, M, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alshehri, AA, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, CF, Anders, JK, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aperio Bella, L, Araque, JP, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, & Arce, ATH. Observation of the associated production of a top quark and a Z boson in pp collisions at $ \sqrt{s} $= 13 TeV with the ATLAS detector. United States. https://doi.org/10.1007/JHEP07(2020)124
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Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Achkar, B, Adachi, S, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Adelman, J, Adersberger, M, Adiguzel, A, Adorni, S, Adye, T, Affolder, AA, Afik, Y, Agapopoulou, C, Agaras, MN, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmadov, F, Ahmed, WS, Ai, X, Aielli, G, Akatsuka, S, Åkesson, TPA, Akilli, E, Akimov, AV, Al Khoury, K, Alberghi, GL, Albert, J, Alconada Verzini, MJ, Alderweireldt, S, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, BMM, Allen, BW, Allport, PP, Aloisio, A, Alonso, F, Alpigiani, C, Alshehri, AA, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, MG, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor Dos Santos, SP, Amoroso, S, Amrouche, CS, An, F, Anastopoulos, C, Andari, N, Andeen, T, Anders, CF, Anders, JK, Andreazza, A, Andrei, V, Anelli, CR, Angelidakis, S, Angerami, A, Anisenkov, AV, Annovi, A, Antel, C, Anthony, MT, Antipov, E, Antonelli, M, Antrim, DJA, Anulli, F, Aoki, M, Aparisi Pozo, JA, Aperio Bella, L, Araque, JP, Araujo Ferraz, V, Araujo Pereira, R, Arcangeletti, C, and Arce, ATH. Mon . "Observation of the associated production of a top quark and a Z boson in pp collisions at $ \sqrt{s} $= 13 TeV with the ATLAS detector". United States. https://doi.org/10.1007/JHEP07(2020)124. https://www.osti.gov/servlets/purl/1650116.
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@article{osti_1650116,
title = {Observation of the associated production of a top quark and a Z boson in pp collisions at $ \sqrt{s} $= 13 TeV with the ATLAS detector},
author = {Aad, G and Abbott, B and Abbott, DC and Abed Abud, A and Abeling, K and Abhayasinghe, DK and Abidi, SH and AbouZeid, OS and Abraham, NL and Abramowicz, H and Abreu, H and Abulaiti, Y and Acharya, BS and Achkar, B and Adachi, S and Adam, L and Adam Bourdarios, C and Adamczyk, L and Adamek, L and Adelman, J and Adersberger, M and Adiguzel, A and Adorni, S and Adye, T and Affolder, AA and Afik, Y and Agapopoulou, C and Agaras, MN and Aggarwal, A and Agheorghiesei, C and Aguilar-Saavedra, JA and Ahmadov, F and Ahmed, WS and Ai, X and Aielli, G and Akatsuka, S and Åkesson, TPA and Akilli, E and Akimov, AV and Al Khoury, K and Alberghi, GL and Albert, J and Alconada Verzini, MJ and Alderweireldt, S and Aleksa, M and Aleksandrov, IN and Alexa, C and Alexopoulos, T and Alfonsi, A and Alfonsi, F and Alhroob, M and Ali, B and Aliev, M and Alimonti, G and Allaire, C and Allbrooke, BMM and Allen, BW and Allport, PP and Aloisio, A and Alonso, F and Alpigiani, C and Alshehri, AA and Alunno Camelia, E and Alvarez Estevez, M and Alviggi, MG and Amaral Coutinho, Y and Ambler, A and Ambroz, L and Amelung, C and Amidei, D and Amor Dos Santos, SP and Amoroso, S and Amrouche, CS and An, F and Anastopoulos, C and Andari, N and Andeen, T and Anders, CF and Anders, JK and Andreazza, A and Andrei, V and Anelli, CR and Angelidakis, S and Angerami, A and Anisenkov, AV and Annovi, A and Antel, C and Anthony, MT and Antipov, E and Antonelli, M and Antrim, DJA and Anulli, F and Aoki, M and Aparisi Pozo, JA and Aperio Bella, L and Araque, JP and Araujo Ferraz, V and Araujo Pereira, R and Arcangeletti, C and Arce, ATH},
abstractNote = {Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 fb-1. Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a b-hadron, are selected. The main backgrounds are from $t\bar{t}Z$ and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for tℓ+ℓ-q production, including non-resonant dilepton pairs with mℓ+ℓ-> 30 GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction.},
doi = {10.1007/JHEP07(2020)124},
journal = {Journal of High Energy Physics (Online)},
number = 7,
volume = 2020,
place = {United States},
year = {Mon Jul 20 00:00:00 EDT 2020},
month = {Mon Jul 20 00:00:00 EDT 2020}
}
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https://doi.org/10.1007/JHEP07(2020)124
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