Search for Heavy Neutral Leptons in W^+→μ ^+μ ^± Jet Decays
R. Aaij,C. Abellán Beteta,T. Ackernley,B. Adeva, M. Adinolfi,H. Afsharnia,C. A. Aidala,S. Aiola,Z. Ajaltouni,S. Akar,J. Albrecht,F. Alessio,M. Alexander, A. Alfonso Albero,Z. Aliouche,G. Alkhazov,P. Alvarez Cartelle,S. Amato,Y. Amhis,L. An,L. Anderlini,A. Andreianov,M. Andreotti,F. Archilli,A. Artamonov,M. Artuso,K. Arzymatov,E. Aslanides,M. Atzeni,B. Audurier,S. Bachmann,M. Bachmayer,J. J. Back,S. Baker,P. Baladron Rodriguez,V. Balagura,W. Baldini, J. Baptista Leite,R. J. Barlow,S. Barsuk,W. Barter,M. Bartolini,F. Baryshnikov,J. M. Basels,G. Bassi,B. Batsukh,A. Battig,A. Bay,M. Becker,F. Bedeschi,I. Bediaga,A. Beiter,V. Belavin,S. Belin,V. Bellee,K. Belous,I. Belov,I. Belyaev, G. Bencivenni,E. Ben-Haim,A. Berezhnoy,R. Bernet, D. Berninghoff,H. C. Bernstein,C. Bertella,E. Bertholet,A. Bertolin,C. Betancourt,F. Betti,M. O. Bettler,Ia. Bezshyiko,S. Bhasin,J. Bhom,L. Bian,M. S. Bieker,S. Bifani,P. Billoir,M. Birch,F. C. R. Bishop,A. Bizzeti,M. Bjørn,M. P. Blago,T. Blake,F. Blanc,S. Blusk,D. Bobulska,V. Bocci,J. A. Boelhauve,O. Boente Garcia,T. Boettcher,A. Boldyrev,A. Bondar,N. Bondar,S. Borghi,M. Borisyak,M. Borsato,J. T. Borsuk,S. A. Bouchiba,T. J. V. Bowcock,A. Boyer,C. Bozzi,M. J. Bradley,S. Braun,A. Brea Rodriguez,M. Brodski,J. Brodzicka,A. Brossa Gonzalo,D. Brundu,A. Buonaura,C. Burr,A. Bursche,A. Butkevich,J. S. Butter,J. Buytaert,W. Byczynski,S. Cadeddu,H. Cai,R. Calabrese,L. Calefice,L. Calero Diaz,S. Cali,R. Calladine,M. Calvi,M. Calvo Gomez,P. Camargo Magalhaes,A. Camboni,P. Campana,D. H. Campora Perez,A. F. Campoverde Quezada,S. Capelli,L. Capriotti,A. Carbone,G. Carboni,R. Cardinale, A. Cardini,I. Carli,P. Carniti,L. Carus,K. Carvalho Akiba,A. Casais Vidal,G. Casse,M. Cattaneo,G. Cavallero,S. Celani,J. Cerasoli,A. J. Chadwick,M. G. Chapman,M. Charles,Ph. Charpentier,G. Chatzikonstantinidis,C. A. Chavez Barajas,M. Chefdeville,C. Chen,S. Chen,A. Chernov,S.-G. Chitic,V. Chobanova,S. Cholak,M. Chrzaszcz,A. Chubykin,V. Chulikov,P. Ciambrone,M. F. 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Liu,H. Liu, S. Liu,X. Liu,A. Loi,J. Lomba Castro,I. Longstaff,J. H. Lopes, G. Loustau, G. H. Lovell, Y. Lu,D. Lucchesi,S. Luchuk, M. Lucio Martinez,V. Lukashenko,Y. Luo,A. Lupato,E. Luppi,O. Lupton,A. Lusiani, X. Lyu,L. Ma, S. Maccolini,F. Machefert,F. Maciuc,V. Macko, P. Mackowiak, S. Maddrell-Mander,O. Madejczyk,L. R. Madhan Mohan,O. Maev, A. Maevskiy,D. Maisuzenko,M. W. Majewski,S. Malde, B. Malecki,A. Malinin, T. Maltsev, H. Malygina, G. Manca,G. Mancinelli,R. Manera Escalero, D. Manuzzi,D. Marangotto,J. Maratas,J. F. Marchand,U. Marconi,S. Mariani,C. Marin Benito,M. Marinangeli, P. Marino,J. Marks,P. J. Marshall,G. Martellotti,L. Martinazzoli,M. Martinelli,D. Martinez Santos,F. Martinez Vidal,A. Massafferri, M. Materok,R. Matev, A. Mathad,Z. Mathe, V. Matiunin,C. Matteuzzi, K. R. Mattioli,A. Mauri,E. Maurice, J. Mauricio,M. Mazurek,M. McCann, L. Mcconnell, T. H. Mcgrath, A. McNab,R. McNulty,J. V. Mead,B. Meadows,C. Meaux,G. Meier,N. Meinert,D. Melnychuk,S. Meloni, M. Merk,A. 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European physical journal C, Particles and fields（2021）
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摘要
search is performed for heavy neutrinos in the decay of a W boson into two muons and a jet. The data set corresponds to an integrated luminosity of approximately 3.0 fb ^-1 of proton–proton collision data at centre-of-mass energies of 7 and 8 TeV collected with the LHCb experiment. Both same-sign and opposite-sign muons in the final state are considered. Data are found to be consistent with the expected background. Upper limits on the coupling of a heavy neutrino with the Standard Model neutrino are set at 95% confidence level in the heavy-neutrino mass range from 5 to 50 GeV/c^2 . These are of the order of 10^-3 for lepton-number-conserving decays and of the order of 10^-4 for lepton-number-violating heavy-neutrino decays.
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