Observation of four-top-quark production in the multilepton final state with the ATLAS detector

ATLAS Collaboration

doi:10.1140/epjc/s10052-023-11573-0

Observation of four-top-quark production in the multilepton final state with the ATLAS detector

ATLAS Collaboration

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Abstract

This paper presents the observation of four-top-quark (tt¯ tt¯) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb ^-1 at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5_-5.5^+6.6 fb, consistent with the SM prediction of 12.0 ± 2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect tt¯tt¯ production.

Original language	English
Article number	496
Number of pages	35
Journal	European Physical Journal C
Volume	83
Issue number	6
DOIs	https://doi.org/10.1140/epjc/s10052-023-11573-0
Publication status	Published - Jun 2023
Externally published	Yes

Bibliographical note

Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

An erratum exists for this article and can be found in The European Physical Journal C, 84(2), 156, doi: 10.1140/epjc/s10052-024-12458-6
Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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Publisher version (open access)Final published version, 2.92 MBLicence: CC BY

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@article{d691f3ac55b24c2ab14e67dfcfcae24e,

title = "Observation of four-top-quark production in the multilepton final state with the ATLAS detector",

abstract = "This paper presents the observation of four-top-quark (tt¯ tt¯) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb -1 at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5-5.5+6.6 fb, consistent with the SM prediction of 12.0 ± 2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect tt¯tt¯ production.",

author = "\{ATLAS Collaboration\} and G. Aad and B. Abbott and K. Abeling and Abicht, \{N. J.\} and Abidi, \{S. H.\} and A. Aboulhorma and H. Abramowicz and H. Abreu and Y. Abulaiti and Hoffman, \{A. C.Abusleme\} and Acharya, \{B. S.\} and Bourdarios, \{C. Adam\} and L. Adamczyk and L. Adamek and Addepalli, \{S. V.\} and Addison, \{M. J.\} and J. Adelman and A. Adiguzel and T. Adye and Affolder, \{A. A.\} and Y. Afik and Agaras, \{M. N.\} and J. Agarwala and A. Aggarwal and C. Agheorghiesei and A. Ahmad and F. Ahmadov and Ahmed, \{W. S.\} and S. Ahuja and X. Ai and G. Aielli and Tamlihat, \{M. Ait\} and B. Aitbenchikh and I. Aizenberg and M. Akbiyik and {\AA}kesson, \{T. P.A.\} and Akimov, \{A. V.\} and D. Akiyama and Akolkar, \{N. N.\} and Khoury, \{K. Al\} and Alberghi, \{G. L.\} and J. Albert and P. Albicocco and Albouy, \{G. L.\} and S. Alderweireldt and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and T. Alexopoulos and A. Alfonsi and F. Alfonsi and M. Algren and M. Alhroob and B. Ali and Ali, \{H. M.J.\} and S. Ali and Alibocus, \{S. W.\} and M. Aliev and G. Alimonti and W. Alkakhi and C. Allaire and Allbrooke, \{B. M.M.\} and Allen, \{J. F.\} and Flores, \{C. A.Allendes\} and Allport, \{P. P.\} and A. Aloisio and F. Alonso and C. Alpigiani and Estevez, \{M. Alvarez\} and Fernandez, \{A. Alvarez\} and Cardoso, \{M. Alves\} and Alviggi, \{M. G.\} and M. Aly and Coutinho, \{Y. Amaral\} and A. Ambler and C. Amelung and M. Amerl and Ames, \{C. G.\} and D. Amidei and Santos, \{S. P.Amor Dos\} and Amos, \{K. R.\} and V. Ananiev and C. Anastopoulos and T. Andeen and Anders, \{J. K.\} and Andrean, \{S. Y.\} and A. Andreazza and S. Angelidakis and A. Angerami and Anisenkov, \{A. V.\} and A. Annovi and C. Antel and Anthony, \{M. T.\} and E. Antipov and M. Antonelli and Antrim, \{D. J.A.\} and F. Anulli and M. Aoki and T. Aoki and Pozo, \{J. A.Aparisi\} and Aparo, \{M. A.\} and Bella, \{L. Aperio\} and C. Appelt and A. Apyan and N. Aranzabal and C. Arcangeletti and Arce, \{A. T.H.\} and E. Arena and Arguin, \{J. F.\} and S. Argyropoulos and Arling, \{J. H.\} and O. Arnaez and H. Arnold and Tame, \{Z. P.Arrubarrena\} and G. Artoni and H. Asada and K. Asai and S. Asai and Asbah, \{N. A.\} and J. Assahsah and K. Assamagan and R. Astalos and S. Atashi and Atkin, \{R. J.\} and M. Atkinson and Atlay, \{N. B.\} and H. Atmani and Atmasiddha, \{P. A.\} and K. Augsten and S. Auricchio and Auriol, \{A. D.\} and Austrup, \{V. A.\} and G. Avolio and K. Axiotis and G. Azuelos and D. Babal and H. Bachacou and K. Bachas and A. Bachiu and F. Backman and A. Badea and P. Bagnaia and M. Bahmani and Bailey, \{A. J.\} and Bailey, \{V. R.\} and Baines, \{J. T.\} and L. Baines and C. Bakalis and Baker, \{O. K.\} and E. Bakos and Gupta, \{D. Bakshi\} and R. Balasubramanian and Baldin, \{E. M.\} and P. Balek and E. Ballabene and F. Balli and Baltes, \{L. M.\} and Balunas, \{W. K.\} and J. Balz and E. Banas and M. Bandieramonte and A. Bandyopadhyay and S. Bansal and L. Barak and M. Barakat and Barberio, \{E. L.\} and D. Barberis and M. Barbero and G. Barbour and Barends, \{K. N.\} and T. Barillari and Barisits, \{M. S.\} and T. Barklow and P. Baron and Moreno, \{D. A.Baron\} and A. Baroncelli and G. Barone and Barr, \{A. J.\} and Barr, \{J. D.\} and Navarro, \{L. Barranco\} and F. Barreiro and \{da Costa\}, \{J. Barreiro Guimar{\~a}es\} and U. Barron and Teixeira, \{M. G.Barros\} and S. Barsov and F. Bartels and R. Bartoldus and Barton, \{A. E.\} and P. Bartos and A. Basan and M. Baselga and A. Bassalat and Basso, \{M. J.\} and Basson, \{C. R.\} and Bates, \{R. L.\} and S. Batlamous and Batley, \{J. R.\} and B. Batool and M. Battaglia and D. Battulga and M. Bauce and M. Bauer and P. Bauer and Hurrell, \{L. T.Bazzano\} and Beacham, \{J. B.\} and T. Beau and Beauchemin, \{P. H.\} and F. Becherer and P. Bechtle and Beck, \{H. P.\} and K. Becker and Beddall, \{A. J.\} and Bednyakov, \{V. A.\} and Bee, \{C. P.\} and Beemster, \{L. J.\} and Beermann, \{T. A.\} and M. Begalli and M. Begel and A. Behera and Behr, \{J. K.\} and Beirer, \{J. F.\} and F. Beisiegel and M. Belfkir and G. Bella and L. Bellagamba and A. Bellerive and P. Bellos and K. Beloborodov and Belyaev, \{N. L.\} and D. Benchekroun and F. Bendebba and Y. Benhammou and M. Benoit and Bensinger, \{J. R.\} and S. Bentvelsen and L. Beresford and M. Beretta and Kuutmann, \{E. Bergeaas\} and N. Berger and B. Bergmann and J. Beringer and G. Bernardi and C. Bernius and Bernlochner, \{F. U.\} and F. Bernon and T. Berry and P. Berta and A. Berthold and Bertram, \{I. A.\} and J. Shojaii",

note = "Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher. An erratum exists for this article and can be found in The European Physical Journal C, 84(2), 156, doi: 10.1140/epjc/s10052-024-12458-6 Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2023",

month = jun,

doi = "10.1140/epjc/s10052-023-11573-0",

language = "English",

volume = "83",

journal = "European Physical Journal C",

issn = "1434-6052",

publisher = "Springer, Springer Nature",

number = "6",

}

TY - JOUR

T1 - Observation of four-top-quark production in the multilepton final state with the ATLAS detector

AU - ATLAS Collaboration

AU - Aad, G.

AU - Abbott, B.

AU - Abeling, K.

AU - Abicht, N. J.

AU - Abidi, S. H.

AU - Aboulhorma, A.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Hoffman, A. C.Abusleme

AU - Acharya, B. S.

AU - Bourdarios, C. Adam

AU - Adamczyk, L.

AU - Adamek, L.

AU - Addepalli, S. V.

AU - Addison, M. J.

AU - Adelman, J.

AU - Adiguzel, A.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agaras, M. N.

AU - Agarwala, J.

AU - Aggarwal, A.

AU - Agheorghiesei, C.

AU - Ahmad, A.

AU - Ahmadov, F.

AU - Ahmed, W. S.

AU - Ahuja, S.

AU - Ai, X.

AU - Aielli, G.

AU - Tamlihat, M. Ait

AU - Aitbenchikh, B.

AU - Aizenberg, I.

AU - Akbiyik, M.

AU - Åkesson, T. P.A.

AU - Akimov, A. V.

AU - Akiyama, D.

AU - Akolkar, N. N.

AU - Khoury, K. Al

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albicocco, P.

AU - Albouy, G. L.

AU - Alderweireldt, S.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexopoulos, T.

AU - Alfonsi, A.

AU - Alfonsi, F.

AU - Algren, M.

AU - Alhroob, M.

AU - Ali, B.

AU - Ali, H. M.J.

AU - Ali, S.

AU - Alibocus, S. W.

AU - Aliev, M.

AU - Alimonti, G.

AU - Alkakhi, W.

AU - Allaire, C.

AU - Allbrooke, B. M.M.

AU - Allen, J. F.

AU - Flores, C. A.Allendes

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, F.

AU - Alpigiani, C.

AU - Estevez, M. Alvarez

AU - Fernandez, A. Alvarez

AU - Cardoso, M. Alves

AU - Alviggi, M. G.

AU - Aly, M.

AU - Coutinho, Y. Amaral

AU - Ambler, A.

AU - Amelung, C.

AU - Amerl, M.

AU - Ames, C. G.

AU - Amidei, D.

AU - Santos, S. P.Amor Dos

AU - Amos, K. R.

AU - Ananiev, V.

AU - Anastopoulos, C.

AU - Andeen, T.

AU - Anders, J. K.

AU - Andrean, S. Y.

AU - Andreazza, A.

AU - Angelidakis, S.

AU - Angerami, A.

AU - Anisenkov, A. V.

AU - Annovi, A.

AU - Antel, C.

AU - Anthony, M. T.

AU - Antipov, E.

AU - Antonelli, M.

AU - Antrim, D. J.A.

AU - Anulli, F.

AU - Aoki, M.

AU - Aoki, T.

AU - Pozo, J. A.Aparisi

AU - Aparo, M. A.

AU - Bella, L. Aperio

AU - Appelt, C.

AU - Apyan, A.

AU - Aranzabal, N.

AU - Arcangeletti, C.

AU - Arce, A. T.H.

AU - Arena, E.

AU - Arguin, J. F.

AU - Argyropoulos, S.

AU - Arling, J. H.

AU - Arnaez, O.

AU - Arnold, H.

AU - Tame, Z. P.Arrubarrena

AU - Artoni, G.

AU - Asada, H.

AU - Asai, K.

AU - Asai, S.

AU - Asbah, N. A.

AU - Assahsah, J.

AU - Assamagan, K.

AU - Astalos, R.

AU - Atashi, S.

AU - Atkin, R. J.

AU - Atkinson, M.

AU - Atlay, N. B.

AU - Atmani, H.

AU - Atmasiddha, P. A.

AU - Augsten, K.

AU - Auricchio, S.

AU - Auriol, A. D.

AU - Austrup, V. A.

AU - Avolio, G.

AU - Axiotis, K.

AU - Azuelos, G.

AU - Babal, D.

AU - Bachacou, H.

AU - Bachas, K.

AU - Bachiu, A.

AU - Backman, F.

AU - Badea, A.

AU - Bagnaia, P.

AU - Bahmani, M.

AU - Bailey, A. J.

AU - Bailey, V. R.

AU - Baines, J. T.

AU - Baines, L.

AU - Bakalis, C.

AU - Baker, O. K.

AU - Bakos, E.

AU - Gupta, D. Bakshi

AU - Balasubramanian, R.

AU - Baldin, E. M.

AU - Balek, P.

AU - Ballabene, E.

AU - Balli, F.

AU - Baltes, L. M.

AU - Balunas, W. K.

AU - Balz, J.

AU - Banas, E.

AU - Bandieramonte, M.

AU - Bandyopadhyay, A.

AU - Bansal, S.

AU - Barak, L.

AU - Barakat, M.

AU - Barberio, E. L.

AU - Barberis, D.

AU - Barbero, M.

AU - Barbour, G.

AU - Barends, K. N.

AU - Barillari, T.

AU - Barisits, M. S.

AU - Barklow, T.

AU - Baron, P.

AU - Moreno, D. A.Baron

AU - Baroncelli, A.

AU - Barone, G.

AU - Barr, A. J.

AU - Barr, J. D.

AU - Navarro, L. Barranco

AU - Barreiro, F.

AU - da Costa, J. Barreiro Guimarães

AU - Barron, U.

AU - Teixeira, M. G.Barros

AU - Barsov, S.

AU - Bartels, F.

AU - Bartoldus, R.

AU - Barton, A. E.

AU - Bartos, P.

AU - Basan, A.

AU - Baselga, M.

AU - Bassalat, A.

AU - Basso, M. J.

AU - Basson, C. R.

AU - Bates, R. L.

AU - Batlamous, S.

AU - Batley, J. R.

AU - Batool, B.

AU - Battaglia, M.

AU - Battulga, D.

AU - Bauce, M.

AU - Bauer, M.

AU - Bauer, P.

AU - Hurrell, L. T.Bazzano

AU - Beacham, J. B.

AU - Beau, T.

AU - Beauchemin, P. H.

AU - Becherer, F.

AU - Bechtle, P.

AU - Beck, H. P.

AU - Becker, K.

AU - Beddall, A. J.

AU - Bednyakov, V. A.

AU - Bee, C. P.

AU - Beemster, L. J.

AU - Beermann, T. A.

AU - Begalli, M.

AU - Begel, M.

AU - Behera, A.

AU - Behr, J. K.

AU - Beirer, J. F.

AU - Beisiegel, F.

AU - Belfkir, M.

AU - Bella, G.

AU - Bellagamba, L.

AU - Bellerive, A.

AU - Bellos, P.

AU - Beloborodov, K.

AU - Belyaev, N. L.

AU - Benchekroun, D.

AU - Bendebba, F.

AU - Benhammou, Y.

AU - Benoit, M.

AU - Bensinger, J. R.

AU - Bentvelsen, S.

AU - Beresford, L.

AU - Beretta, M.

AU - Kuutmann, E. Bergeaas

AU - Berger, N.

AU - Bergmann, B.

AU - Beringer, J.

AU - Bernardi, G.

AU - Bernius, C.

AU - Bernlochner, F. U.

AU - Bernon, F.

AU - Berry, T.

AU - Berta, P.

AU - Berthold, A.

AU - Bertram, I. A.

AU - Shojaii, J.

N1 - Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher. An erratum exists for this article and can be found in The European Physical Journal C, 84(2), 156, doi: 10.1140/epjc/s10052-024-12458-6 Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2023/6

Y1 - 2023/6

N2 - This paper presents the observation of four-top-quark (tt¯ tt¯) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb -1 at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5-5.5+6.6 fb, consistent with the SM prediction of 12.0 ± 2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect tt¯tt¯ production.

AB - This paper presents the observation of four-top-quark (tt¯ tt¯) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb -1 at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5-5.5+6.6 fb, consistent with the SM prediction of 12.0 ± 2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect tt¯tt¯ production.

UR - http://10.1140/epjc/s10052-024-12458-6

UR - https://www.scopus.com/pages/publications/85164151361

UR - http://www.scopus.com/inward/record.url?scp=85190710850&partnerID=8YFLogxK

U2 - 10.1140/epjc/s10052-023-11573-0

DO - 10.1140/epjc/s10052-023-11573-0

M3 - Article

AN - SCOPUS:85164151361

SN - 1434-6052

VL - 83

JO - European Physical Journal C

JF - European Physical Journal C

IS - 6

M1 - 496

ER -

Observation of four-top-quark production in the multilepton final state with the ATLAS detector

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