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

A bstract 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 analy...

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Veröffentlicht in:JHEP 2024-03, Vol.2024 (3), p.105
Hauptverfasser: Andrejkovic, J. W., Templ, S., Lowette, S., Tavernier, S., Vannerom, D., Hong, Y., Knolle, J., Rendón, C., Benecke, A., Delaere, C., Coelho, E., Hensel, C., Barroso Ferreira Filho, M., Zhang, L., Rodriguez, M., Nandan, S., Kinnunen, R., Baldenegro Barrera, C., Liu, G., Dozen, C., Aldaya Martin, M., Filatov, O., Otarid, Y., Yang, Y., Albrecht, S., Grohsjean, A., Korcari, W., Lange, J., Stadie, H., Chaudhary, G., Sharma, S., Ramirez-Sanchez, G., Ranieri, A., Tuve, C., De Guio, F., Carnevali, F., Santocchia, A., Tenchini, R., Demaria, N., Vlasov, E., Kim, T. J., Lee, S., Yang, U. K., Encinas Acosta, H. A., Mondragon Herrera, C. A., Salazar Ibarguen, H. A., Bluj, M., Górski, M., Fernández Ramos, J. P., Redondo, I., Sánchez Navas, S., Bhowmik, S., Innocente, V., Moortgat, F., Piparo, D., Ebrahimi, A., Steggemann, J., Canelli, M. F., Jin, W., Chen, P. s., Lu, R.-S., Kiminsu, U., Potok, O., Cussans, D., McMaster, B., Rumerio, P., Heintz, U., Kukral, O., Gary, J. W., Lee, R., Andrews, M. B., Dutta, V., Roberts, A., Cumalat, J. P., Hassani, A., Feng, Y., Grünendahl, S., Joshi, U., Rosenzweig, S., Yanes, E., Köseyan, O. K., Royon, C., Yang, T. J., Marzocchi, B., Wadud, M. A., Bloom, K., Morse, D. M., Monk, D. G., Ho, K. W., Lange, D., Jones, M., Koshy, A. M., Piperov, S., Thieman, J., Jaroslawski, D., Eusebi, R., Hegde, V., Sheldon, P., Dimova, T., Gavrilov, V.
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container_end_page
container_issue 3
container_start_page 105
container_title JHEP
container_volume 2024
creator Andrejkovic, J. W.
Templ, S.
Lowette, S.
Tavernier, S.
Vannerom, D.
Hong, Y.
Knolle, J.
Rendón, C.
Benecke, A.
Delaere, C.
Coelho, E.
Hensel, C.
Barroso Ferreira Filho, M.
Zhang, L.
Rodriguez, M.
Nandan, S.
Kinnunen, R.
Baldenegro Barrera, C.
Liu, G.
Dozen, C.
Aldaya Martin, M.
Filatov, O.
Otarid, Y.
Yang, Y.
Albrecht, S.
Grohsjean, A.
Korcari, W.
Lange, J.
Stadie, H.
Chaudhary, G.
Sharma, S.
Ramirez-Sanchez, G.
Ranieri, A.
Tuve, C.
De Guio, F.
Carnevali, F.
Santocchia, A.
Tenchini, R.
Demaria, N.
Vlasov, E.
Kim, T. J.
Lee, S.
Yang, U. K.
Encinas Acosta, H. A.
Mondragon Herrera, C. A.
Salazar Ibarguen, H. A.
Bluj, M.
Górski, M.
Fernández Ramos, J. P.
Redondo, I.
Sánchez Navas, S.
Bhowmik, S.
Innocente, V.
Moortgat, F.
Piparo, D.
Ebrahimi, A.
Steggemann, J.
Canelli, M. F.
Jin, W.
Chen, P. s.
Lu, R.-S.
Kiminsu, U.
Potok, O.
Cussans, D.
McMaster, B.
Rumerio, P.
Heintz, U.
Kukral, O.
Gary, J. W.
Lee, R.
Andrews, M. B.
Dutta, V.
Roberts, A.
Cumalat, J. P.
Hassani, A.
Feng, Y.
Grünendahl, S.
Joshi, U.
Rosenzweig, S.
Yanes, E.
Köseyan, O. K.
Royon, C.
Yang, T. J.
Marzocchi, B.
Wadud, M. A.
Bloom, K.
Morse, D. M.
Monk, D. G.
Ho, K. W.
Lange, D.
Jones, M.
Koshy, A. M.
Piperov, S.
Thieman, J.
Jaroslawski, D.
Eusebi, R.
Hegde, V.
Sheldon, P.
Dimova, T.
Gavrilov, V.
description A bstract 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 V ℓ N 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 | V μ N 2 | > 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.
doi_str_mv 10.1007/JHEP03(2024)105
format Article
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W. ; Templ, S. ; Lowette, S. ; Tavernier, S. ; Vannerom, D. ; Hong, Y. ; Knolle, J. ; Rendón, C. ; Benecke, A. ; Delaere, C. ; Coelho, E. ; Hensel, C. ; Barroso Ferreira Filho, M. ; Zhang, L. ; Rodriguez, M. ; Nandan, S. ; Kinnunen, R. ; Baldenegro Barrera, C. ; Liu, G. ; Dozen, C. ; Aldaya Martin, M. ; Filatov, O. ; Otarid, Y. ; Yang, Y. ; Albrecht, S. ; Grohsjean, A. ; Korcari, W. ; Lange, J. ; Stadie, H. ; Chaudhary, G. ; Sharma, S. ; Ramirez-Sanchez, G. ; Ranieri, A. ; Tuve, C. ; De Guio, F. ; Carnevali, F. ; Santocchia, A. ; Tenchini, R. ; Demaria, N. ; Vlasov, E. ; Kim, T. J. ; Lee, S. ; Yang, U. K. ; Encinas Acosta, H. A. ; Mondragon Herrera, C. A. ; Salazar Ibarguen, H. A. ; Bluj, M. ; Górski, M. ; Fernández Ramos, J. P. ; Redondo, I. ; Sánchez Navas, S. ; Bhowmik, S. ; Innocente, V. ; Moortgat, F. ; Piparo, D. ; Ebrahimi, A. ; Steggemann, J. ; Canelli, M. 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W. ; Templ, S. ; Lowette, S. ; Tavernier, S. ; Vannerom, D. ; Hong, Y. ; Knolle, J. ; Rendón, C. ; Benecke, A. ; Delaere, C. ; Coelho, E. ; Hensel, C. ; Barroso Ferreira Filho, M. ; Zhang, L. ; Rodriguez, M. ; Nandan, S. ; Kinnunen, R. ; Baldenegro Barrera, C. ; Liu, G. ; Dozen, C. ; Aldaya Martin, M. ; Filatov, O. ; Otarid, Y. ; Yang, Y. ; Albrecht, S. ; Grohsjean, A. ; Korcari, W. ; Lange, J. ; Stadie, H. ; Chaudhary, G. ; Sharma, S. ; Ramirez-Sanchez, G. ; Ranieri, A. ; Tuve, C. ; De Guio, F. ; Carnevali, F. ; Santocchia, A. ; Tenchini, R. ; Demaria, N. ; Vlasov, E. ; Kim, T. J. ; Lee, S. ; Yang, U. K. ; Encinas Acosta, H. A. ; Mondragon Herrera, C. A. ; Salazar Ibarguen, H. A. ; Bluj, M. ; Górski, M. ; Fernández Ramos, J. P. ; Redondo, I. ; Sánchez Navas, S. ; Bhowmik, S. ; Innocente, V. ; Moortgat, F. ; Piparo, D. ; Ebrahimi, A. ; Steggemann, J. ; Canelli, M. F. ; Jin, W. ; Chen, P. s. ; Lu, R.-S. ; Kiminsu, U. ; Potok, O. ; Cussans, D. ; McMaster, B. ; Rumerio, P. ; Heintz, U. ; Kukral, O. ; Gary, J. W. ; Lee, R. ; Andrews, M. B. ; Dutta, V. ; Roberts, A. ; Cumalat, J. P. ; Hassani, A. ; Feng, Y. ; Grünendahl, S. ; Joshi, U. ; Rosenzweig, S. ; Yanes, E. ; Köseyan, O. K. ; Royon, C. ; Yang, T. J. ; Marzocchi, B. ; Wadud, M. A. ; Bloom, K. ; Morse, D. M. ; Monk, D. G. ; Ho, K. W. ; Lange, D. ; Jones, M. ; Koshy, A. M. ; Piperov, S. ; Thieman, J. ; Jaroslawski, D. ; Eusebi, R. ; Hegde, V. ; Sheldon, P. ; Dimova, T. ; Gavrilov, V. ; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States) ; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)</creatorcontrib><description>A bstract 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 V ℓ N 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 | V μ N 2 | &gt; 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.</description><identifier>ISSN: 1029-8479</identifier><identifier>EISSN: 1029-8479</identifier><identifier>DOI: 10.1007/JHEP03(2024)105</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Artificial neural networks ; Asymmetry ; Beyond Standard Model ; Classical and Quantum Gravitation ; Collaboration ; Confidence intervals ; Coupling ; Elementary Particles ; Flavor (particle physics) ; Hadron-Hadron Scattering ; High Energy Physics - Experiment ; Large Hadron Collider ; Leptons ; Lifetime ; Luminosity ; Muons ; Neural networks ; Neutrinos ; Particle decay ; Physics ; Physics and Astronomy ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Protons ; Quantum Field Theories ; Quantum Field Theory ; Quantum Physics ; Quarks ; Regular Article - Experimental Physics ; Relativity Theory ; Searching ; Sensors ; Solenoids ; String Theory</subject><ispartof>JHEP, 2024-03, Vol.2024 (3), p.105</ispartof><rights>The Author(s) 2024</rights><rights>The Author(s) 2024. 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P.</creatorcontrib><creatorcontrib>Hassani, A.</creatorcontrib><creatorcontrib>Feng, Y.</creatorcontrib><creatorcontrib>Grünendahl, S.</creatorcontrib><creatorcontrib>Joshi, U.</creatorcontrib><creatorcontrib>Rosenzweig, S.</creatorcontrib><creatorcontrib>Yanes, E.</creatorcontrib><creatorcontrib>Köseyan, O. K.</creatorcontrib><creatorcontrib>Royon, C.</creatorcontrib><creatorcontrib>Yang, T. J.</creatorcontrib><creatorcontrib>Marzocchi, B.</creatorcontrib><creatorcontrib>Wadud, M. A.</creatorcontrib><creatorcontrib>Bloom, K.</creatorcontrib><creatorcontrib>Morse, D. M.</creatorcontrib><creatorcontrib>Monk, D. G.</creatorcontrib><creatorcontrib>Ho, K. W.</creatorcontrib><creatorcontrib>Lange, D.</creatorcontrib><creatorcontrib>Jones, M.</creatorcontrib><creatorcontrib>Koshy, A. M.</creatorcontrib><creatorcontrib>Piperov, S.</creatorcontrib><creatorcontrib>Thieman, J.</creatorcontrib><creatorcontrib>Jaroslawski, D.</creatorcontrib><creatorcontrib>Eusebi, R.</creatorcontrib><creatorcontrib>Hegde, V.</creatorcontrib><creatorcontrib>Sheldon, P.</creatorcontrib><creatorcontrib>Dimova, T.</creatorcontrib><creatorcontrib>Gavrilov, V.</creatorcontrib><creatorcontrib>Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)</creatorcontrib><creatorcontrib>Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)</creatorcontrib><title>Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton</title><title>JHEP</title><addtitle>J. High Energ. Phys</addtitle><description>A bstract 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 V ℓ N 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 | V μ N 2 | &gt; 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.</description><subject>Artificial neural networks</subject><subject>Asymmetry</subject><subject>Beyond Standard Model</subject><subject>Classical and Quantum Gravitation</subject><subject>Collaboration</subject><subject>Confidence intervals</subject><subject>Coupling</subject><subject>Elementary Particles</subject><subject>Flavor (particle physics)</subject><subject>Hadron-Hadron Scattering</subject><subject>High Energy Physics - Experiment</subject><subject>Large Hadron Collider</subject><subject>Leptons</subject><subject>Lifetime</subject><subject>Luminosity</subject><subject>Muons</subject><subject>Neural networks</subject><subject>Neutrinos</subject><subject>Particle decay</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</subject><subject>Protons</subject><subject>Quantum Field Theories</subject><subject>Quantum Field Theory</subject><subject>Quantum Physics</subject><subject>Quarks</subject><subject>Regular Article - Experimental Physics</subject><subject>Relativity Theory</subject><subject>Searching</subject><subject>Sensors</subject><subject>Solenoids</subject><subject>String Theory</subject><issn>1029-8479</issn><issn>1029-8479</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>C6C</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpNkc9r2zAUx01ZoVm6c6-iu6wHt0-_LPsYSrdsBFpodxay_Bw7eFYmKS6B_fFTcGA76b2nDx-e9M2yGwr3FEA9_Fg_vQD_woCJOwryIltQYFVeClV9-K--yj6GsAOgklawyP68ovG2I63zZHDjNh_6CRvSoZmOZMRD9GYgA-6jGwN572N3bkg7mMkdPLHpAv3Uj1uSFFPvBhNPTYPWHAOJjhiyw0jM2KTKdsZvk3-WXGeXrRkCfjqfy-zn16e3x3W-ef72_XG1yS0DJXMmGpS8aGRbI1BTMCFQopENYFFJIZQSqqxUXdYFlKKmyAuwbc2tEqaqFefL7Hb2uhB7HWwf0XZp8RFt1IyVqiiKBN3NUGcGvff9L-OP2pler1cbfZqBEIxTChNN7OeZ3Xv3-4Ah6l36izG9QbOqlIIzXpaJgpkKSTdu0f-jKOhTaHoOTZ9CSwPJ_wL5y4lW</recordid><startdate>20240319</startdate><enddate>20240319</enddate><creator>Andrejkovic, J. 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M.</creator><creator>Piperov, S.</creator><creator>Thieman, J.</creator><creator>Jaroslawski, D.</creator><creator>Eusebi, R.</creator><creator>Hegde, V.</creator><creator>Sheldon, P.</creator><creator>Dimova, T.</creator><creator>Gavrilov, V.</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><general>Springer Nature</general><scope>C6C</scope><scope>8FE</scope><scope>8FG</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>1XC</scope><scope>OIOZB</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0003-3090-2948</orcidid></search><sort><creationdate>20240319</creationdate><title>Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton</title><author>Andrejkovic, J. W. ; Templ, S. ; Lowette, S. ; Tavernier, S. ; Vannerom, D. ; Hong, Y. ; Knolle, J. ; Rendón, C. ; Benecke, A. ; Delaere, C. ; Coelho, E. ; Hensel, C. ; Barroso Ferreira Filho, M. ; Zhang, L. ; Rodriguez, M. ; Nandan, S. ; Kinnunen, R. ; Baldenegro Barrera, C. ; Liu, G. ; Dozen, C. ; Aldaya Martin, M. ; Filatov, O. ; Otarid, Y. ; Yang, Y. ; Albrecht, S. ; Grohsjean, A. ; Korcari, W. ; Lange, J. ; Stadie, H. ; Chaudhary, G. ; Sharma, S. ; Ramirez-Sanchez, G. ; Ranieri, A. ; Tuve, C. ; De Guio, F. ; Carnevali, F. ; Santocchia, A. ; Tenchini, R. ; Demaria, N. ; Vlasov, E. ; Kim, T. J. ; Lee, S. ; Yang, U. K. ; Encinas Acosta, H. A. ; Mondragon Herrera, C. A. ; Salazar Ibarguen, H. A. ; Bluj, M. ; Górski, M. ; Fernández Ramos, J. P. ; Redondo, I. ; Sánchez Navas, S. ; Bhowmik, S. ; Innocente, V. ; Moortgat, F. ; Piparo, D. ; Ebrahimi, A. ; Steggemann, J. ; Canelli, M. F. ; Jin, W. ; Chen, P. s. ; Lu, R.-S. ; Kiminsu, U. ; Potok, O. ; Cussans, D. ; McMaster, B. ; Rumerio, P. ; Heintz, U. ; Kukral, O. ; Gary, J. W. ; Lee, R. ; Andrews, M. B. ; Dutta, V. ; Roberts, A. ; Cumalat, J. P. ; Hassani, A. ; Feng, Y. ; Grünendahl, S. ; Joshi, U. ; Rosenzweig, S. ; Yanes, E. ; Köseyan, O. K. ; Royon, C. ; Yang, T. J. ; Marzocchi, B. ; Wadud, M. A. ; Bloom, K. ; Morse, D. M. ; Monk, D. G. ; Ho, K. W. ; Lange, D. ; Jones, M. ; Koshy, A. M. ; Piperov, S. ; Thieman, J. ; Jaroslawski, D. ; Eusebi, R. ; Hegde, V. ; Sheldon, P. ; Dimova, T. ; Gavrilov, V.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2075-24de536d5fbe01a6244e5ea5d0e695447747897b8b6084b1e360cfb3c74a9b733</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Artificial neural networks</topic><topic>Asymmetry</topic><topic>Beyond Standard Model</topic><topic>Classical and Quantum Gravitation</topic><topic>Collaboration</topic><topic>Confidence intervals</topic><topic>Coupling</topic><topic>Elementary Particles</topic><topic>Flavor (particle physics)</topic><topic>Hadron-Hadron Scattering</topic><topic>High Energy Physics - Experiment</topic><topic>Large Hadron Collider</topic><topic>Leptons</topic><topic>Lifetime</topic><topic>Luminosity</topic><topic>Muons</topic><topic>Neural networks</topic><topic>Neutrinos</topic><topic>Particle decay</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</topic><topic>Protons</topic><topic>Quantum Field Theories</topic><topic>Quantum Field Theory</topic><topic>Quantum Physics</topic><topic>Quarks</topic><topic>Regular Article - Experimental Physics</topic><topic>Relativity Theory</topic><topic>Searching</topic><topic>Sensors</topic><topic>Solenoids</topic><topic>String Theory</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Andrejkovic, J. W.</creatorcontrib><creatorcontrib>Templ, S.</creatorcontrib><creatorcontrib>Lowette, S.</creatorcontrib><creatorcontrib>Tavernier, S.</creatorcontrib><creatorcontrib>Vannerom, D.</creatorcontrib><creatorcontrib>Hong, Y.</creatorcontrib><creatorcontrib>Knolle, J.</creatorcontrib><creatorcontrib>Rendón, C.</creatorcontrib><creatorcontrib>Benecke, A.</creatorcontrib><creatorcontrib>Delaere, C.</creatorcontrib><creatorcontrib>Coelho, E.</creatorcontrib><creatorcontrib>Hensel, C.</creatorcontrib><creatorcontrib>Barroso Ferreira Filho, M.</creatorcontrib><creatorcontrib>Zhang, L.</creatorcontrib><creatorcontrib>Rodriguez, M.</creatorcontrib><creatorcontrib>Nandan, S.</creatorcontrib><creatorcontrib>Kinnunen, R.</creatorcontrib><creatorcontrib>Baldenegro Barrera, C.</creatorcontrib><creatorcontrib>Liu, G.</creatorcontrib><creatorcontrib>Dozen, C.</creatorcontrib><creatorcontrib>Aldaya Martin, M.</creatorcontrib><creatorcontrib>Filatov, O.</creatorcontrib><creatorcontrib>Otarid, Y.</creatorcontrib><creatorcontrib>Yang, Y.</creatorcontrib><creatorcontrib>Albrecht, S.</creatorcontrib><creatorcontrib>Grohsjean, A.</creatorcontrib><creatorcontrib>Korcari, W.</creatorcontrib><creatorcontrib>Lange, J.</creatorcontrib><creatorcontrib>Stadie, H.</creatorcontrib><creatorcontrib>Chaudhary, G.</creatorcontrib><creatorcontrib>Sharma, S.</creatorcontrib><creatorcontrib>Ramirez-Sanchez, G.</creatorcontrib><creatorcontrib>Ranieri, A.</creatorcontrib><creatorcontrib>Tuve, C.</creatorcontrib><creatorcontrib>De Guio, F.</creatorcontrib><creatorcontrib>Carnevali, F.</creatorcontrib><creatorcontrib>Santocchia, A.</creatorcontrib><creatorcontrib>Tenchini, R.</creatorcontrib><creatorcontrib>Demaria, N.</creatorcontrib><creatorcontrib>Vlasov, E.</creatorcontrib><creatorcontrib>Kim, T. 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M.</creatorcontrib><creatorcontrib>Piperov, S.</creatorcontrib><creatorcontrib>Thieman, J.</creatorcontrib><creatorcontrib>Jaroslawski, D.</creatorcontrib><creatorcontrib>Eusebi, R.</creatorcontrib><creatorcontrib>Hegde, V.</creatorcontrib><creatorcontrib>Sheldon, P.</creatorcontrib><creatorcontrib>Dimova, T.</creatorcontrib><creatorcontrib>Gavrilov, V.</creatorcontrib><creatorcontrib>Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)</creatorcontrib><creatorcontrib>Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)</creatorcontrib><collection>Springer Nature OA Free Journals</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies &amp; Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Advanced Technologies &amp; Aerospace Database</collection><collection>ProQuest Advanced Technologies &amp; Aerospace Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>JHEP</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Andrejkovic, J. W.</au><au>Templ, S.</au><au>Lowette, S.</au><au>Tavernier, S.</au><au>Vannerom, D.</au><au>Hong, Y.</au><au>Knolle, J.</au><au>Rendón, C.</au><au>Benecke, A.</au><au>Delaere, C.</au><au>Coelho, E.</au><au>Hensel, C.</au><au>Barroso Ferreira Filho, M.</au><au>Zhang, L.</au><au>Rodriguez, M.</au><au>Nandan, S.</au><au>Kinnunen, R.</au><au>Baldenegro Barrera, C.</au><au>Liu, G.</au><au>Dozen, C.</au><au>Aldaya Martin, M.</au><au>Filatov, O.</au><au>Otarid, Y.</au><au>Yang, Y.</au><au>Albrecht, S.</au><au>Grohsjean, A.</au><au>Korcari, W.</au><au>Lange, J.</au><au>Stadie, H.</au><au>Chaudhary, G.</au><au>Sharma, S.</au><au>Ramirez-Sanchez, G.</au><au>Ranieri, A.</au><au>Tuve, C.</au><au>De Guio, F.</au><au>Carnevali, F.</au><au>Santocchia, A.</au><au>Tenchini, R.</au><au>Demaria, N.</au><au>Vlasov, E.</au><au>Kim, T. J.</au><au>Lee, S.</au><au>Yang, U. K.</au><au>Encinas Acosta, H. A.</au><au>Mondragon Herrera, C. A.</au><au>Salazar Ibarguen, H. A.</au><au>Bluj, M.</au><au>Górski, M.</au><au>Fernández Ramos, J. P.</au><au>Redondo, I.</au><au>Sánchez Navas, S.</au><au>Bhowmik, S.</au><au>Innocente, V.</au><au>Moortgat, F.</au><au>Piparo, D.</au><au>Ebrahimi, A.</au><au>Steggemann, J.</au><au>Canelli, M. F.</au><au>Jin, W.</au><au>Chen, P. s.</au><au>Lu, R.-S.</au><au>Kiminsu, U.</au><au>Potok, O.</au><au>Cussans, D.</au><au>McMaster, B.</au><au>Rumerio, P.</au><au>Heintz, U.</au><au>Kukral, O.</au><au>Gary, J. W.</au><au>Lee, R.</au><au>Andrews, M. B.</au><au>Dutta, V.</au><au>Roberts, A.</au><au>Cumalat, J. P.</au><au>Hassani, A.</au><au>Feng, Y.</au><au>Grünendahl, S.</au><au>Joshi, U.</au><au>Rosenzweig, S.</au><au>Yanes, E.</au><au>Köseyan, O. K.</au><au>Royon, C.</au><au>Yang, T. J.</au><au>Marzocchi, B.</au><au>Wadud, M. A.</au><au>Bloom, K.</au><au>Morse, D. M.</au><au>Monk, D. G.</au><au>Ho, K. W.</au><au>Lange, D.</au><au>Jones, M.</au><au>Koshy, A. M.</au><au>Piperov, S.</au><au>Thieman, J.</au><au>Jaroslawski, D.</au><au>Eusebi, R.</au><au>Hegde, V.</au><au>Sheldon, P.</au><au>Dimova, T.</au><au>Gavrilov, V.</au><aucorp>Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)</aucorp><aucorp>Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton</atitle><jtitle>JHEP</jtitle><stitle>J. High Energ. Phys</stitle><date>2024-03-19</date><risdate>2024</risdate><volume>2024</volume><issue>3</issue><spage>105</spage><pages>105-</pages><issn>1029-8479</issn><eissn>1029-8479</eissn><abstract>A bstract 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 V ℓ N 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 | V μ N 2 | &gt; 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.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/JHEP03(2024)105</doi><orcidid>https://orcid.org/0000-0003-3090-2948</orcidid><oa>free_for_read</oa></addata></record>
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subjects Artificial neural networks
Asymmetry
Beyond Standard Model
Classical and Quantum Gravitation
Collaboration
Confidence intervals
Coupling
Elementary Particles
Flavor (particle physics)
Hadron-Hadron Scattering
High Energy Physics - Experiment
Large Hadron Collider
Leptons
Lifetime
Luminosity
Muons
Neural networks
Neutrinos
Particle decay
Physics
Physics and Astronomy
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Protons
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Experimental Physics
Relativity Theory
Searching
Sensors
Solenoids
String Theory
title Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton
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