Search for long-lived heavy neutral leptons in proton-proton collision events with a lepton-jet pair associated with a secondary vertex at $$ \sqrt{s} $$ = 13 TeV

A bstract A search for long-lived heavy neutral leptons (HNLs) using proton-proton collision data corresponding to an integrated luminosity of 138 fb − 1 collected at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV with the CMS detector at the CERN LHC is presented. Events are selected with a charged lepton originating from the primary vertex associated with the proton-proton interaction, as well as a second charged lepton and a hadronic jet associated with a secondary vertex that corresponds to the semileptonic decay of a long-lived HNL. No excess of events above the standard model expectation is observed. Exclusion limits at 95% confidence level are evaluated for HNLs that mix with electron and/or muon neutrinos. Limits are presented in the mass range of 1–16.5 GeV, with excluded square mixing parameter values reaching as low as 2 × 10 − 7 . For masses above 11 GeV, the presented limits exceed all previous results in the semileptonic decay channel, and for some of the considered scenarios are the strongest to date.

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Journal
Journal of High Energy Physics
Published
2025-02-06
DOI
https://doi.org/10.1007/jhep02(2025)036
Citations
1
Primary Topic
Particle physics theoretical and experimental studies
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article
Field-Weighted Citation Impact
1.87

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article

Search for long-lived heavy neutral leptons in proton-proton collision events with a lepton-jet pair associated with a secondary vertex at $$ \sqrt{s} $$ = 13 TeV

T. Reis, B. Kailasapathy, M. A. Ciocci, S. Polikarpov et al.
1 citations
Journal of High Energy Physics
Particle physics theoretical and experimental studies
1.87
article

Search for long-lived heavy neutral leptons in proton-proton collision events with a lepton-jet pair associated with a secondary vertex at $$ \sqrt{s} $$ = 13 TeV

T. Reis, B. Kailasapathy, M. A. Ciocci, S. Polikarpov, A. Vilela Pereira, Ismail Okan Atakisi, K. Rabbertz, S. Mukherjee, P. G. Kosmoglou Kioseoglou, V. Brigljević, S. Bansal, M. M. A. Gadallah, P. Azzurri, S. W. Lee, B. Hacışahinoğlu, J. Tao, Chun-Hua Jiang, Lovisa Rygaard, James Natoli, B. Blumenfeld, W. L. Aldá Júnior, N. Venkatasubramanian, I. Vai, P. Zehetner, V. Wachirapusitanand, Aashay Arora, O. Filatov, A. Lapertosa, G. Sorrentino, M. Horzela, L. Zygala, K. Shchelina, Soumik Chandra, B. Akgün, M. Stamenkovic, Vincenzo Innocente, M. Presilla, A. Garcia-Bellido, G. Milella, A. Reimers, K. Lamichhane, L. P. Nair, Daniil Rastorguev, S. Mishra, Aurora Perego, N. Bin Norjoharuddeen, Fakhri Alam Khan, D. R. Claes, S. Sánchez Cruz, R. Klanner, A. Grohsjean, A. Escalante Del Valle, C. Savard, F. De Guio, Muhammad Anwar Iqbal, C. Fangmeier, S. Luo, F. Ivone, Niramay Gogate, S. My, Cesare Cazzaniga, N. Parmar, E. Asilar, P. K. Behera, K. T. S. Kallonen, J. Vazquez Escobar, M. 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Abstract

A bstract A search for long-lived heavy neutral leptons (HNLs) using proton-proton collision data corresponding to an integrated luminosity of 138 fb − 1 collected at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV with the CMS detector at the CERN LHC is presented. Events are selected with a charged lepton originating from the primary vertex associated with the proton-proton interaction, as well as a second charged lepton and a hadronic jet associated with a secondary vertex that corresponds to the semileptonic decay of a long-lived HNL. No excess of events above the standard model expectation is observed. Exclusion limits at 95% confidence level are evaluated for HNLs that mix with electron and/or muon neutrinos. Limits are presented in the mass range of 1–16.5 GeV, with excluded square mixing parameter values reaching as low as 2 × 10 − 7 . For masses above 11 GeV, the presented limits exceed all previous results in the semileptonic decay channel, and for some of the considered scenarios are the strongest to date.

Journal of High Energy PhysicsVol. 2025(2)
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Reduced inequalities
Openalex Percentile: Top 16%
Particle physics theoretical and experimental studies
1.87
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