LHCb CollaborationAaij, R.Beteta, C. AbellanAdeva, B.Adinolfi, M.Aidala, C. A.Ajaltouni, Z.Akar, S.Albicocco, P.Albrecht, J.Alessio, F.Alexander, M.Albero, A. AlfonsoAlkhazov, G.Cartelle, P. AlvarezAlves, A. A., Jr.Amato, S.Amerio, S.Amhis, Y.An, L.Anderlini, L.Andreassi, G.Andreotti, M.Andrews, J. E.Archilli, F.d'Argent, P.Romeu, J. ArnauArtamonov, A.Artuso, M.Arzymatov, K.Aslanides, E.Atzeni, M.Audurier, B.Bachmann, S.Back, J. J.Baker, S.Balagura, V.Baldini, W.Baranov, A.Barlow, R. J.Barrand, G. C.Barsuk, S.Barter, W.Bartolini, M.baryshnikov, F.Batozskaya, V.Batsukh, B.Battig, A.Battista, V.Bay, A.Beddow, J.Bedeschi, F.Bediaga, I.Beiter, A.Bel, L. J.Belin, S.Beliy, N.Bellee, V.Belloli, N.Belous, K.Belyaev, I.Ben-Haim, E.Bencivenni, G.Benson, S.Beranek, S.Berezhnoy, A.Bernet, R.Berninghoff, D.Bertholet, E.Bertolin, A.Betancourt, C.Betti, F.Bettler, M. O.van Beuzekom, M.Bezshyiko, Ia.Bhasin, S.Bhom, J.Bifani, S.Billoir, P.Birnkraut, A.Bizzeti, A.Bjorn, M.Blago, M. P.Blake, T.Blanc, F.Blusk, S.Bobulska, D.Bocci, V.Boente Garcia, O.Boettcher, T.Bondar, A.Bondar, N.Borghi, S.Borisyak, M.Borsato, M.Bossu, F.Boubdir, M.Bowcock, T. J. V.Bozzi, C.Braun, S.Brodski, M.Brodzicka, J.Gonzalo, A. BrossaBrundu, D.Buchanan, E.Buonaura, A.Burr, C.Bursche, A.Buytaert, J.Byczynski, W.Cadeddu, S.Cai, H.Calabrese, R.Calladine, R.Calvi, M.Calvo Gomez, M.Camboni, A.Campana, P.Perez, D. H. CamporaCapriotti, L.Carbone, A.Carboni, G.Cardinale, R.Cardini, A.Carniti, P.Carvalho Akiba, K.Casse, G.Cassina, L.Cattaneo, M.Cavallero, G.Cenci, R.Chamont, D.Chapman, M. G.Charles, M.Charpentier, Ph.Chatzikonstantinidis, G.Chefdeville, M.Chekalina, V.Chen, C.Chen, S.Chitic, S. -G.Chobanova, V.Chrzaszcz, M.Chubykin, A.Ciambrone, P.Cid Vidal, X.Ciezarek, G.Cindolo, F.Clarke, P. E. L.Clemencic, M.Cliff, H. V.Closier, J.Coco, V.Coelho, J. A. B.Cogan, J.Cogneras, E.Cojocariu, L.Collins, P.Colombo, T.Comerma-Montells, A.Contu, A.Coombs, G.Coquereau, S.Corti, G.Corvo, M.Sobral, C. M. CostaCouturier, B.Cowan, G. A.Craik, D. C.Crocombe, A.Cruz Torres, M.Currie, R.D'Ambrosio, C.Da Cunha Marinho, F.Da Silva, C. L.Dall'Occo, E.Dalseno, J.Danilina, A.Davis, A.Francisco, O. De AguiarDe Bruyn, K.De Capua, S.De Cian, M.De Miranda, J. M.De Paula, L.De Serio, M.De Simone, P.Dean, C. T.Decamp, D.Del Buono, L.Delaney, B.Dembinski, H. -P.Demmer, M.Dendek, A.Derkach, D.Deschamps, O.Desse, F.Dettori, F.Dey, B.Di Canto, A.Di Nezza, P.Didenko, S.Dijkstra, H.Dordei, F.Dorigo, M.Dosil Suarez, A.Douglas, L.Dovbnya, A.Dreimanis, K.Dufour, L.Dujany, G.Durante, P.Durham, J. M.Dutta, D.Dzhelyadin, R.Dziewiecki, M.Dziurda, A.Dzyuba, A.Easo, S.Egede, U.Egorychev, V.Eidelman, S.Eisenhardt, S.Eitschberger, U.Ekelhof, R.Eklund, L.Ely, S.Ene, A.Escher, S.Esen, S.Evans, T.Falabella, A.Farley, N.Farry, S.Fazzini, D.Declara, P. FernandezFernandez Prieto, A.Ferrari, F.Lopes, L. FerreiraFerreira Rodrigues, F.Ferro-Luzzi, M.Filippov, S.Fini, R. A.Fiorini, M.Firlej, M.Fitzpatrick, C.Fiutowski, T.Fleuret, F.Fontana, M.Fontanelli, F.Forty, R.Lima, V. FrancoFrank, M.Frei, C.Fu, J.Funk, W.Farber, C.Feo, M.Gabriel, E.Gallas Torreira, A.Galli, D.Gallorini, S.Gambetta, S.Gan, Y.Gandelman, M.Gandini, P.Gao, Y.Garcia Martin, L. M.Garcia Plana, B.Pardinas, J. GarciaTico, J. GarraGarrido, L.Gascon, D.Gaspar, C.Gavardi, L.Gazzoni, G.Gerick, D.Gersabeck, E.Gersabeck, M.Gershon, T.Gerstel, D.Ghez, Ph.Gibson, V.Girard, O. G.Gironella Gironell, P.Giubega, L.Gizdov, K.Gligorov, V. V.Golubkov, D.Golutvin, A.Gomes, A.Gorelov, I. V.Gotti, C.Govorkova, E.Grabowski, J. P.Graciani Diaz, R.Cardoso, L. A. GranadoGrauges, E.Graverini, E.Graziani, G.Grecu, A.Greim, R.Griffith, P.Grillo, L.Gruber, L.Cazon, B. R. GrubergGruenberg, O.Gu, C.Gushchin, E.Guth, A.Guz, Yu.Gys, T.Gobel, C.Hadavizadeh, T.Hadjivasiliou, C.Haefeli, G.Haen, C.Haines, S. C.Hamilton, B.Han, X.Hancock, T. H.Hansmann-Menzemer, S.Harnew, N.Harrison, T.Hasse, C.Hatch, M.He, J.Hecker, M.Heinicke, K.Heister, A.Hennessy, K.Henry, L.van Herwijnen, E.Heuel, J.Hess, M.Hicheur, A.Charman, R. HidalgoHill, D.Hilton, M.Hopchev, P. H.Hu, J.Hu, W.Huang, W.Huard, Z. C.Hulsbergen, W.Humair, T.Hushchyn, M.Hutchcroft, D.Hynds, D.Ibis, P.Idzik, M.Ilten, P.Inglessi, A.Inyakin, A.Ivshin, K.Jacobsson, R.Jalocha, J.Jans, E.Jashal, B. K.Jawahery, A.Jiang, F.John, M.Johnson, D.Jones, C. R.Joram, C.Jost, B.Jurik, N.Kandybei, S.Karacson, M.Kariuki, J. M.Karodia, S.Kazeev, N.Kecke, M.Keizer, F.Kelsey, M.Kenzie, M.Ketel, T.Khairullin, E.Khanji, B.Khurewathanakul, C.Kim, K. E.Kirn, T.Kirsebom, V. S.Klaver, S.Klimaszewski, K.Klimkovich, T.Koliiev, S.Kolpin, M.Kopecna, R.Koppenburg, P.Kostiuk, I.Kotriakhova, S.Kozeiha, M.Kravchuk, L.Kreps, M.Kress, F.Krokovny, P.Krupa, W.Krzemien, W.Kucewicz, W.Kucharczyk, M.Kudryavtsev, V.Kuonen, A. 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E.Straticiuc, M.Straumann, U.Strokov, S.Sun, J.Sun, L.Sun, Y.Swientek, K.Szabelski, A.Szumlak, T.Szymanski, M.T'Jampens, S.Tang, Z.Tayduganov, A.Tekampe, T.Tellarini, G.Teubert, F.Thomas, E.van Tilburg, J.Tilley, M. J.Tisserand, V.Tobin, M.Tolk, S.Tomassetti, L.Tonelli, D.Tou, D. Y.Tourinho Jadallah Aoude, R.Tournefier, E.Traill, M.Tran, M. T.Trisovic, A.Tsaregorodtsev, A.Tuci, G.Tully, A.Tuning, N.Ukleja, A.Usachov, A.Ustyuzhanin, A.Uwer, U.Vagner, A.Vagnoni, V.Valassi, A.Valat, S.Valenti, G.Gomez, R. VazquezVazquez Regueiro, P.Vecchi, S.van Veghel, M.Velthuis, J. J.Veltri, M.Veneziano, G.Venkateswaran, A.Vernet, M.Veronesi, M.Vesterinen, M.Barbosa, J. V. VianaVieira, D.Vieites Diaz, M.Viemann, H.Vilasis-Cardona, X.Vitkovskiy, A.Vitti, M.Volkov, V.Vollhardt, A.Bruch, D. VomVoneki, B.Vorobyev, A.Vorobyev, V.Voropaev, N.de Vries, J. A.Sierra, C. VazquezWaldi, R.Walsh, J.Wang, J.Wang, M.Wang, Y.Wang, Z.Ward, D. R.Wark, H. M.Watson, N. K.Websdale, D.Weiden, A.Weisser, C.Whitehead, M.Wilkinson, G.Wilkinson, M.Williams, I.Williams, M. R. J.Williams, M.Williams, T.Wilson, F. F.Winn, M.Wislicki, W.Witek, M.Wormser, G.Wotton, S. A.Wyllie, K.Xiao, D.Xie, Y.Xu, A.Xu, M.Xu, Q.Xu, Z.Yang, Z.Yao, Y.Yeomans, L. E.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zarebski, K. A.Zavertyaev, M.Zhang, D.Zhang, L.Zhang, W. C.Zhang, Y.Zhelezov, A.Zheng, Y.Zhu, X.Zhukov, V.Zonneveld, J. B.Zucchelli, S.2021-04-102021-04-102021-04-102021-03-0110.1140/epjc/s10052-021-08973-5https://infoscience.epfl.ch/handle/20.500.14299/177224WOS:000631882200001A 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-signmuons 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 50GeV/c2. 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.Physics, Particles & FieldsPhysicstext::journal::journal article::research article