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Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in s = 13 TeV pp collisions with the ATLAS detector

Publication ,  Journal Article
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, NJ; Abidi, SH; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y ...
Published in: Journal of High Energy Physics
July 1, 2025

A search is performed for long-lived heavy neutral leptons (HNLs), produced through the decay of a W boson along with a muon or electron. Two channels are explored: a leptonic channel, in which the HNL decays into two leptons and a neutrino, and a semi-leptonic channel, in which the HNL decays into a lepton and a charged pion. The search is performed with 140 fb−1 of s = 13 TeV proton-proton collision data collected by ATLAS during Run 2 of the Large Hadron Collider. No excess of events is observed; Dirac-like and Majorana-like HNLs with masses below 14.5 GeV and mixing coefficients as small as 10−7 are excluded at the 95% confidence level. The results are interpreted under different assumptions on the flavour of the leptons from the HNL decays.

Duke Scholars

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

July 1, 2025

Volume

2025

Issue

7

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics
 

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Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. J., … Aoki, T. (2025). Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in s = 13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics, 2025(7). https://doi.org/10.1007/JHEP07(2025)196
Aad, G., E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, et al. “Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in s = 13 TeV pp collisions with the ATLAS detector.” Journal of High Energy Physics 2025, no. 7 (July 1, 2025). https://doi.org/10.1007/JHEP07(2025)196.
Aad G, Aakvaag E, Abbott B, Abdelhameed S, Abeling K, Abicht NJ, et al. Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in s = 13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics. 2025 Jul 1;2025(7).
Aad, G., et al. “Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in s = 13 TeV pp collisions with the ATLAS detector.” Journal of High Energy Physics, vol. 2025, no. 7, July 2025. Scopus, doi:10.1007/JHEP07(2025)196.
Aad G, Aakvaag E, Abbott B, Abdelhameed S, Abeling K, Abicht NJ, Abidi SH, Aboelela M, Aboulhorma A, Abramowicz H, Abulaiti Y, Acharya BS, Ackermann A, Adam Bourdarios C, Adamczyk L, Addepalli SV, Addison MJ, Adelman J, Adiguzel A, Adye T, Affolder AA, Afik Y, Agaras MN, Aggarwal A, Agheorghiesei C, Ahmadov F, Ahuja S, Ai X, Aielli G, Aikot A, Ait Tamlihat M, Aitbenchikh B, Akbiyik M, Åkesson TPA, Akimov AV, Akiyama D, Akolkar NN, Aktas S, Alberghi GL, Albert J, Albicocco P, Albouy GL, Alderweireldt S, Alegria ZL, Aleksa M, Aleksandrov IN, Alexa C, Alexopoulos T, Alfonsi F, Algren M, Alhroob M, Ali B, Ali HMJ, Ali S, Alibocus SW, Aliev M, Alimonti G, Alkakhi W, Allaire C, Allbrooke BMM, Allen JS, Allen JF, Allport PP, Aloisio A, Alonso F, Alpigiani C, Alsolami ZMK, Alvarez Fernandez A, Alves Cardoso M, Alviggi MG, Aly M, Amaral Coutinho Y, Ambler A, Amelung C, Amerl M, Ames CG, Amezza T, Amidei D, Amini B, Amirie K, Amirkhanov A, Amor Dos Santos SP, Amos KR, Amperiadou D, An S, Anastopoulos C, Andeen T, Anders JK, Anderson AC, Andreazza A, Angelidakis S, Angerami A, Anisenkov AV, Annovi A, Antel C, Antipov E, Antonelli M, Anulli F, Aoki M, Aoki T. Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in s = 13 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics. 2025 Jul 1;2025(7).
Journal cover image

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

July 1, 2025

Volume

2025

Issue

7

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics