Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton

被引：6

作者：

A. Hayrapetyan ^{[86
]}

A. Tumasyan ^{[89
]}

W. Adam ^{[279
]}

J. W. Andrejkovic ^{[1
]}

T. Bergauer ^{[1
]}

S. Chatterjee ^{[209
]}

K. Damanakis ^{[2
]}

M. Dragicevic ^{[2
]}

P. S. Hussain ^{[2
]}

M. Jeitler ^{[2
]}

N. Krammer ^{[2
]}

A. Li ^{[2
]}

D. Liko ^{[2
]}

I. Mikulec ^{[2
]}

J. Schieck ^{[210
]}

R. Schöfbeck ^{[2
]}

D. Schwarz ^{[2
]}

M. Sonawane ^{[2
]}

S. Templ ^{[2
]}

W. Waltenberger ^{[2
]}

C.-E. Wulz ^{[210
]}

M. R. Darwish ^{[2
]}

T. Janssen ^{[2
]}

P. Van Mechelen ^{[2
]}

E. S. Bols ^{[2
]}

J. D’Hondt ^{[2
]}

S. Dansana ^{[2
]}

A. De Moor ^{[210
]}

M. Delcourt ^{[3
]}

H. El Faham ^{[211
]}

S. Lowette ^{[3
]}

I. Makarenko ^{[3
]}

D. Müller ^{[4
]}

A. R. Sahasransu ^{[4
]}

S. Tavernier ^{[4
]}

M. Tytgat ^{[4
]}

G. P. Van Onsem ^{[4
]}

S. Van Putte ^{[4
]}

D. Vannerom ^{[4
]}

B. Clerbaux ^{[4
]}

A. K. Das ^{[4
]}

G. De Lentdecker ^{[4
]}

L. Favart ^{[4
]}

P. Gianneios ^{[4
]}

D. Hohov ^{[6
]}

J. Jaramillo ^{[4
]}

A. Khalilzadeh ^{[4
]}

K. Lee ^{[4
]}

M. Mahdavikhorrami ^{[5
]}

A. Malara ^{[5
]}

机构：

[1] Yerevan Physics Institute,Universidade Estadual Paulista

[2] Institut für Hochenergiephysik,Institute for Nuclear Research and Nuclear Energy

[3] Universiteit Antwerpen,Instituto De Alta Investigación

[4] Vrije Universiteit Brussel,Department of Physics

[5] Université Libre de Bruxelles,State Key Laboratory of Nuclear Physics and Technology

[6] Ghent University,Center for High Energy Physics (CHEP

[7] Université Catholique de Louvain,FU)

[8] Centro Brasileiro de Pesquisas Fisicas,Department of Physics

[9] Universidade do Estado do Rio de Janeiro,MTA

[10] Universidade Federal do ABC,ELTE Lendület CMS Particle and Nuclear Physics Group

[11] Bulgarian Academy of Sciences,Faculty of Informatics

[12] University of Sofia,College of Engineering and Technology

[13] Universidad de Tarapacá,National Centre for Particle Physics

[14] Beihang University,National Centre for Physics

[15] Tsinghua University,Institute of Experimental Physics, Faculty of Physics

[16] Institute of High Energy Physics,Faculty of Physics

[17] Peking University,VINCA Institute of Nuclear Sciences

[18] Sun Yat-Sen University,High Energy Physics Research Unit, Department of Physics, Faculty of Science

[19] University of Science and Technology of China,Institute of Basic and Applied Sciences, Faculty of Engineering

[20] Nanjing Normal University,Institute of Physics

[21] Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) — Fudan University,Physics Department, Faculty of Science

[22] Zhejiang University,Department of Physics

[23] Universidad de Los Andes,Department of Physics

[24] Universidad de Antioquia,Department of Applied Physics, Faculty of Science and Technology

[25] University of Split,School of Physics and Astronomy

[26] Faculty of Electrical Engineering,undefined

[27] Mechanical Engineering and Naval Architecture,undefined

[28] University of Split,undefined

[29] Faculty of Science,undefined

[30] Institute Rudjer Boskovic,undefined

[31] University of Cyprus,undefined

[32] Charles University,undefined

[33] Escuela Politecnica Nacional,undefined

[34] Universidad San Francisco de Quito,undefined

[35] Academy of Scientific Research and Technology of the Arab Republic of Egypt,undefined

[36] Egyptian Network of High Energy Physics,undefined

[37] Fayoum University,undefined

[38] National Institute of Chemical Physics and Biophysics,undefined

[39] University of Helsinki,undefined

[40] Helsinki Institute of Physics,undefined

[41] Lappeenranta-Lahti University of Technology,undefined

[42] IRFU,undefined

[43] CEA,undefined

[44] Université Paris-Saclay,undefined

[45] Laboratoire Leprince-Ringuet,undefined

[46] CNRS/IN2P3,undefined

[47] Ecole Polytechnique,undefined

[48] Institut Polytechnique de Paris,undefined

[49] Université de Strasbourg,undefined

[50] CNRS,undefined

来源：

Journal of High Energy Physics | / 2024卷 / 3期

关键词：

Beyond Standard Model; Hadron-Hadron Scattering; Lifetime;

D O I：

10.1007/JHEP03(2024)105

中图分类号：

学科分类号：

摘要：

A search for long-lived heavy neutral leptons (HNLs) is presented, which considers the hadronic final state and coupling scenarios involving all three lepton generations in the 2–20 GeV HNL mass range for the first time. Events comprising two leptons (electrons or muons) and jets are analyzed in a data sample of proton-proton collisions, recorded with the CMS experiment at the CERN LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb−1. A novel jet tagger, based on a deep neural network, has been developed to identify jets from an HNL decay using various features of the jet and its constituent particles. The network output can be used as a powerful discriminating tool to probe a broad range of HNL lifetimes and masses. Contributions from background processes are determined from data. No excess of events in data over the expected background is observed. Upper limits on the HNL production cross section are derived as functions of the HNL mass and the three coupling strengths VℓN to each lepton generation ℓ and presented as exclusion limits in the coupling-mass plane, as lower limits on the HNL lifetime, and on the HNL mass. In this search, the most stringent limit on the coupling strength is obtained for pure muon coupling scenarios; values of |VμN2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {V}_{\mu \textrm{N}}^2 $$\end{document}| > 5 (4) × 10−7 are excluded for Dirac (Majorana) HNLs with a mass of 10 GeV at a confidence level of 95% that correspond to proper decay lengths of 17 (10) mm.

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