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Search for heavy right-handed Majorana neutrinos in the decay of top quarks produced in proton-proton collisions at s = 13 TeV with the ATLAS detector

Aad, G. [Aix-Marseille Université] (ORCID:0000000266654934)·Aakvaag, E. [University of Bergen] (ORCID:0000000176161554)·Abbott, B. [University of Oklahoma] (ORCID:0000000258882734)·Abdelhameed, S. [New York University Abu Dhabi] (ORCID:0000000202875869)·Abeling, K. [Georg-August-Universität Göttingen] (ORCID:0000000210021652)·Abicht, N. J. [Technische Universität Dortmund] (ORCID:0000000157632760)·Abidi, S. H. [Brookhaven National Laboratory] (ORCID:0000000284969294)·Aboelela, M. [Southern Methodist University] (ORCID:000900036578220X)·Aboulhorma, A. [Université Mohammed V] (ORCID:0000000299872292)·Abramowicz, H. [Tel Aviv University] (ORCID:0000000153296640)·Abreu, H. [Technion, Israel Institute of Technology] (ORCID:0000000215992896)·Abulaiti, Y. [New York University] (ORCID:0000000304033697)·Acharya, B. S. [INFN Gruppo Collegato di Udine; ICTP] (ORCID:0000000285889157)·Ackermann, A. [Ruprecht-Karls-Universität Heidelberg] (ORCID:0000000346997275)·Adam Bourdarios, C. [Université Savoie Mont Blanc] (ORCID:0000000226344958)·Adamczyk, L. [AGH University of Krakow] (ORCID:0000000258592075)·Addepalli, S. V. [Brandeis University] (ORCID:0000000229196663)·Addison, M. J. [University of Manchester] (ORCID:0000000283873661)·Adelman, J. [Northern Illinois University] (ORCID:0000000210413496)·Adiguzel, A. [Istanbul University] (ORCID:0000000166440517)·Adye, T. [Particle Physics Department, Rutherford Appleton Laboratory] (ORCID:0000000306275059)·Affolder, A. A. [University of California Santa Cruz] (ORCID:0000000290587217)·Afik, Y. [University of Chicago] (ORCID:000000018102356X)·Agaras, M. N. [Barcelona Institute of Science and Technology] (ORCID:0000000243555589)·Agarwala, J. [INFN Sezione di Pavia; Università di Pavia] (ORCID:0000000247547455)·Aggarwal, A. [Universität Mainz] (ORCID:0000000219222039)·Agheorghiesei, C. [Alexandru Ioan Cuza University of Iasi] (ORCID:0000000336951847)·Ahmadov, F. [CERN] (ORCID:000000033644540X)·Ahmed, W. S. [McGill University] (ORCID:0000000301283279)·Ahuja, S. [Royal Holloway University of London] (ORCID:0000000343689285)·Ai, X. [Zhengzhou University] (ORCID:0000000338562415)·Aielli, G. [INFN Sezione di Roma Tor Vergata; Università di Roma Tor Vergata] (ORCID:0000000205738114)·Aikot, A. [Centro Mixto Universidad de Valencia—CSIC] (ORCID:0000000165786890)·Ait Tamlihat, M. [Université Mohammed V] (ORCID:0000000213224666)·Aitbenchikh, B. [Université Hassan II de Casablanca] (ORCID:0000000280201181)·Akbiyik, M. [Universität Mainz] (ORCID:0000000273423130)·Åkesson, T. P. A. [Lunds universitet] (ORCID:0000000341415408)·Akimov, A. V. [CERN] (ORCID:0000000228462958)·Akiyama, D. [Waseda University] (ORCID:0000000176236421)·Akolkar, N. N. [Universität Bonn] (ORCID:0000000334242123)·Aktas, S. [Bogazici University] (ORCID:0000000282506501)·Al Khoury, K. [Columbia University] (ORCID:0000000205478199)·Alberghi, G. L. [INFN Sezione di Bologna] (ORCID:000000032388987X)·Albert, J. [University of Victoria] (ORCID:0000000302532505)·Albicocco, P. [INFN e Laboratori Nazionali di Frascati] (ORCID:0000000164301038)·Albouy, G. L. [Université Grenoble Alpes] (ORCID:0000000308300107)·Alderweireldt, S. [University of Edinburgh] (ORCID:0000000282247036)·Alegria, Z. L. [Oklahoma State University] (ORCID:0000000219770799)·Aleksa, M. [CERN] (ORCID:0000000219369217)·Aleksandrov, I. N. [CERN] (ORCID:0000000173816762)·Alexa, C. [Horia Hulubei National Institute of Physics and Nuclear Engineering] (ORCID:0000000309227669)·Alexopoulos, T. [National Technical University of Athens] (ORCID:000000028977279X)·Alfonsi, F. [INFN Sezione di Bologna] (ORCID:0000000209660211)·Algren, M. [Université de Genève] (ORCID:0000000317931787)·Alhroob, M. [University of Warwick] (ORCID:0000000175697111)·Ali, B. [Czech Technical University in Prague] (ORCID:0000000186535556)·Ali, H. M. J. [Lancaster University] (ORCID:0000000245077349)·Ali, S. [California State University] (ORCID:0000000152163133)·Alibocus, S. W. [University of Liverpool] (ORCID:0000000293778852)·Aliev, M. [University of Johannesburg] (ORCID:0000000290123746)·Alimonti, G. [INFN Sezione di Milano] (ORCID:0000000271289046)·Alkakhi, W. [Georg-August-Universität Göttingen] (ORCID:0000000193554245)·Allaire, C. [Université Paris-Saclay] (ORCID:000000034745538X)·Allbrooke, B. M. M. [University of Sussex] (ORCID:0000000257382471)·Allen, J. F. [University of Edinburgh] (ORCID:0000000199907486)·Allendes Flores, C. A. [Universidad Técnica Federico Santa María] (ORCID:0000000215093217)·Allport, P. P. [University of Birmingham] (ORCID:0000000173032570)·Aloisio, A. [INFN Sezione di Napoli; Università di Napoli] (ORCID:0000000238836693)·Alonso, F. [Universidad Nacional de La Plata and CONICET] (ORCID:0000000194318156)·Alpigiani, C. [University of Washington] (ORCID:0000000276415814)·Alsolami, Z. M. K. [Lancaster University] (ORCID:0000000237850709)·Alvarez Estevez, M. [Universidad Autónoma de Madrid] (ORCID:0000000281816532)·Alvarez Fernandez, A. [Universität Mainz] (ORCID:0000000315254620)·Alves Cardoso, M. [Université de Genève] (ORCID:000000020042292X)·Alviggi, M. G. [INFN Sezione di Napoli; Università di Napoli] (ORCID:000000030026982X)·Aly, M. [University of Manchester] (ORCID:0000000330433715)·Amaral Coutinho, Y. [Universidade Federal do Rio De Janeiro COPPE/EE/IF] (ORCID:0000000217987230)·Ambler, A. [McGill University] (ORCID:0000000321843480)·Amelung, C. [CERN]·Amerl, M. [University of Manchester] (ORCID:0000000311557982)·Ames, C. G. [Ludwig-Maximilians-Universität München] (ORCID:0000000221264246)·Amidei, D. [University of Michigan] (ORCID:0000000268140355)·Amirie, K. J. [University of Toronto] (ORCID:0000000280297347)·Amor Dos Santos, S. P. [Laboratório de Instrumentação e Física Experimental de Partículas—LIP] (ORCID:0000000175666067)·Amos, K. R. [Centro Mixto Universidad de Valencia—CSIC] (ORCID:0000000317575620)·An, S. [KEK]·Ananiev, V. [University of Oslo] (ORCID:0000000336497621)·Anastopoulos, C. [University of Sheffield] (ORCID:0000000315875830)·Andeen, T. [University of Texas at Austin] (ORCID:000000024413871X)·Anders, J. K. [CERN] (ORCID:0000000218460262)·Anderson, A. C. [University of Glasgow] (ORCID:0009000996824656)·Andrean, S. Y. [Stockholm University; Oskar Klein Centre] (ORCID:0000000297662670)·Andreazza, A. [INFN Sezione di Milano; Università di Milano] (ORCID:0000000151615759)·Angelidakis, S. [National and Kapodistrian University of Athens] (ORCID:0000000282746118)·Angerami, A. [Columbia University] (ORCID:0000000178348750)·Anisenkov, A. V. [CERN] (ORCID:0000000272015936)·Annovi, A. [INFN Sezione di Pisa] (ORCID:0000000246494398)·Antel, C. [Université de Genève] (ORCID:0000000196830890)·Antipov, E. [Stony Brook University] (ORCID:0000000266787665)·Antonelli, M. [INFN e Laboratori Nazionali di Frascati] (ORCID:0000000222935726)
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Abstract

A search for heavy right-handed Majorana neutrinos is performed with the ATLAS detector at the CERN Large Hadron Collider, using the 140 fb -1 of proton–proton collision data at $\sqrt{s}$ =13 TeV collected during Run 2. This search targets $t\overline{t}$ production, in which both top quarks decay into a bottom quark and a W boson, where one of the W bosons decays hadronically and the other decays into an electron or muon and a heavy neutral lepton. The heavy neutral lepton is identified through a decay into an electron or muon and another W boson, resulting in a pair of same-charge same-flavor leptons in the final state. This paper presents the first search for heavy neutral leptons in the mass range of 15–75 GeV using $t\overline{t}$ events. No significant excess is observed over the background expectation, and upper limits are placed on the signal cross sections. Assuming a benchmark scenario of the phenomenological type-I seesaw model, these cross section limits are then translated into upper limits on the mixing parameters of the heavy Majorana neutrino with Standard Model neutrinos.

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSHeavy neutrinosMajorana neutrinosTop quark

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Aad, G. [Aix-Marseille Université] (ORCID:0000000266654934), Aakvaag, E. [University of Bergen] (ORCID:0000000176161554), Abbott, B. [University of Oklahoma] (ORCID:0000000258882734), Abdelhameed, S. [New York University Abu Dhabi] (ORCID:0000000202875869), Abeling, K. [Georg-August-Universität Göttingen] (ORCID:0000000210021652), Abicht, N. J. [Technische Universität Dortmund] (ORCID:0000000157632760), Abidi, S. H. [Brookhaven National Laboratory] (ORCID:0000000284969294), Aboelela, M. [Southern Methodist University] (ORCID:000900036578220X), Aboulhorma, A. [Université Mohammed V] (ORCID:0000000299872292), Abramowicz, H. [Tel Aviv University] (ORCID:0000000153296640), Abreu, H. [Technion, Israel Institute of Technology] (ORCID:0000000215992896), Abulaiti, Y. [New York University] (ORCID:0000000304033697), Acharya, B. S. [INFN Gruppo Collegato di Udine; ICTP] (ORCID:0000000285889157), Ackermann, A. [Ruprecht-Karls-Universität Heidelberg] (ORCID:0000000346997275), Adam Bourdarios, C. [Université Savoie Mont Blanc] (ORCID:0000000226344958), Adamczyk, L. [AGH University of Krakow] (ORCID:0000000258592075), Addepalli, S. V. [Brandeis University] (ORCID:0000000229196663), Addison, M. J. [University of Manchester] (ORCID:0000000283873661), Adelman, J. [Northern Illinois University] (ORCID:0000000210413496), Adiguzel, A. [Istanbul University] (ORCID:0000000166440517), Adye, T. [Particle Physics Department, Rutherford Appleton Laboratory] (ORCID:0000000306275059), Affolder, A. A. [University of California Santa Cruz] (ORCID:0000000290587217), Afik, Y. [University of Chicago] (ORCID:000000018102356X), Agaras, M. N. [Barcelona Institute of Science and Technology] (ORCID:0000000243555589), Agarwala, J. [INFN Sezione di Pavia; Università di Pavia] (ORCID:0000000247547455), Aggarwal, A. [Universität Mainz] (ORCID:0000000219222039), Agheorghiesei, C. [Alexandru Ioan Cuza University of Iasi] (ORCID:0000000336951847), Ahmadov, F. [CERN] (ORCID:000000033644540X), Ahmed, W. S. [McGill University] (ORCID:0000000301283279), Ahuja, S. [Royal Holloway University of London] (ORCID:0000000343689285), Ai, X. [Zhengzhou University] (ORCID:0000000338562415), Aielli, G. [INFN Sezione di Roma Tor Vergata; Università di Roma Tor Vergata] (ORCID:0000000205738114), Aikot, A. [Centro Mixto Universidad de Valencia—CSIC] (ORCID:0000000165786890), Ait Tamlihat, M. [Université Mohammed V] (ORCID:0000000213224666), Aitbenchikh, B. [Université Hassan II de Casablanca] (ORCID:0000000280201181), Akbiyik, M. [Universität Mainz] (ORCID:0000000273423130), Åkesson, T. P. A. [Lunds universitet] (ORCID:0000000341415408), Akimov, A. V. [CERN] (ORCID:0000000228462958), Akiyama, D. [Waseda University] (ORCID:0000000176236421), Akolkar, N. N. [Universität Bonn] (ORCID:0000000334242123), Aktas, S. [Bogazici University] (ORCID:0000000282506501), Al Khoury, K. [Columbia University] (ORCID:0000000205478199), Alberghi, G. L. [INFN Sezione di Bologna] (ORCID:000000032388987X), Albert, J. [University of Victoria] (ORCID:0000000302532505), Albicocco, P. [INFN e Laboratori Nazionali di Frascati] (ORCID:0000000164301038), Albouy, G. L. [Université Grenoble Alpes] (ORCID:0000000308300107), Alderweireldt, S. [University of Edinburgh] (ORCID:0000000282247036), Alegria, Z. L. [Oklahoma State University] (ORCID:0000000219770799), Aleksa, M. [CERN] (ORCID:0000000219369217), Aleksandrov, I. N. [CERN] (ORCID:0000000173816762), Alexa, C. [Horia Hulubei National Institute of Physics and Nuclear Engineering] (ORCID:0000000309227669), Alexopoulos, T. [National Technical University of Athens] (ORCID:000000028977279X), Alfonsi, F. [INFN Sezione di Bologna] (ORCID:0000000209660211), Algren, M. [Université de Genève] (ORCID:0000000317931787), Alhroob, M. [University of Warwick] (ORCID:0000000175697111), Ali, B. [Czech Technical University in Prague] (ORCID:0000000186535556), Ali, H. M. J. [Lancaster University] (ORCID:0000000245077349), Ali, S. [California State University] (ORCID:0000000152163133), Alibocus, S. W. [University of Liverpool] (ORCID:0000000293778852), Aliev, M. [University of Johannesburg] (ORCID:0000000290123746), Alimonti, G. [INFN Sezione di Milano] (ORCID:0000000271289046), Alkakhi, W. [Georg-August-Universität Göttingen] (ORCID:0000000193554245), Allaire, C. [Université Paris-Saclay] (ORCID:000000034745538X), Allbrooke, B. M. M. [University of Sussex] (ORCID:0000000257382471), Allen, J. F. [University of Edinburgh] (ORCID:0000000199907486), Allendes Flores, C. A. [Universidad Técnica Federico Santa María] (ORCID:0000000215093217), Allport, P. P. [University of Birmingham] (ORCID:0000000173032570), Aloisio, A. [INFN Sezione di Napoli; Università di Napoli] (ORCID:0000000238836693), Alonso, F. [Universidad Nacional de La Plata and CONICET] (ORCID:0000000194318156), Alpigiani, C. [University of Washington] (ORCID:0000000276415814), Alsolami, Z. M. K. [Lancaster University] (ORCID:0000000237850709), Alvarez Estevez, M. [Universidad Autónoma de Madrid] (ORCID:0000000281816532), Alvarez Fernandez, A. [Universität Mainz] (ORCID:0000000315254620), Alves Cardoso, M. [Université de Genève] (ORCID:000000020042292X), Alviggi, M. G. [INFN Sezione di Napoli; Università di Napoli] (ORCID:000000030026982X), Aly, M. [University of Manchester] (ORCID:0000000330433715), Amaral Coutinho, Y. [Universidade Federal do Rio De Janeiro COPPE/EE/IF] (ORCID:0000000217987230), Ambler, A. [McGill University] (ORCID:0000000321843480), Amelung, C. [CERN], Amerl, M. [University of Manchester] (ORCID:0000000311557982), Ames, C. G. [Ludwig-Maximilians-Universität München] (ORCID:0000000221264246), Amidei, D. [University of Michigan] (ORCID:0000000268140355), Amirie, K. J. [University of Toronto] (ORCID:0000000280297347), Amor Dos Santos, S. P. [Laboratório de Instrumentação e Física Experimental de Partículas—LIP] (ORCID:0000000175666067), Amos, K. R. [Centro Mixto Universidad de Valencia—CSIC] (ORCID:0000000317575620), An, S. [KEK], Ananiev, V. [University of Oslo] (ORCID:0000000336497621), Anastopoulos, C. [University of Sheffield] (ORCID:0000000315875830), Andeen, T. [University of Texas at Austin] (ORCID:000000024413871X), Anders, J. K. [CERN] (ORCID:0000000218460262), Anderson, A. C. [University of Glasgow] (ORCID:0009000996824656), Andrean, S. Y. [Stockholm University; Oskar Klein Centre] (ORCID:0000000297662670), Andreazza, A. [INFN Sezione di Milano; Università di Milano] (ORCID:0000000151615759), Angelidakis, S. [National and Kapodistrian University of Athens] (ORCID:0000000282746118), Angerami, A. [Columbia University] (ORCID:0000000178348750), Anisenkov, A. V. [CERN] (ORCID:0000000272015936), Annovi, A. [INFN Sezione di Pisa] (ORCID:0000000246494398), Antel, C. [Université de Genève] (ORCID:0000000196830890), Antipov, E. [Stony Brook University] (ORCID:0000000266787665), Antonelli, M. [INFN e Laboratori Nazionali di Frascati] (ORCID:0000000222935726). 2024-12-02. Search for heavy right-handed Majorana neutrinos in the decay of top quarks produced in proton-proton collisions at s = 13 TeV with the ATLAS detector. https://doi.org/10.1103/physrevd.110.112004

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