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T.Tsaregorodtsev, A.Tuning, N.Ukleja, A.Urquijo, P.Uwer, U.Vagnoni, V.Valenti, G.Vazquez Gomez, R.Vazquez Regueiro, P.Vecchi, S.Velthuis, J. J.Veltri, M.Vervink, K.Viaud, B.Videau, I.Vilasis-Cardona, X.Visniakov, J.Vollhardt, A.Voong, D.Vorobyev, A.Voss, H.Wacker, K.Wandernoth, S.Wang, J.Ward, D. R.Webber, A. D.Websdale, D.Whitehead, M.Wiedner, D.Wiggers, L.Wilkinson, G.Williams, M. P.Williams, M.Wilson, F. F.Wishahi, J.Witek, M.Witzeling, W.Wotton, S. A.Wyllie, K.Xie, Y.Xing, F.Xing, Z.Yang, Z.Young, R.Yushchenko, O.Zavertyaev, M.Zhang, L.Zhang, W. C.Zhang, Y.Zhelezov, A.Zhong, L.Zverev, E.Zvyagin, A.2012-04-052012-04-052012-04-05201210.1103/PhysRevLett.108.101601https://infoscience.epfl.ch/handle/20.500.14299/79185WOS:000301180200002A search is performed for the lepton number violating decay B+ -> h(-)mu(+)mu(+), where h(-) represents a K- or a pi(-), using an integrated luminosity of 36 pb(-1) of data collected with the LHCb detector. The decay is forbidden in the standard model but allowed in models with a Majorana neutrino. No signal is observed in either channel and limits of B(B+ -> h(-)mu(+)mu(+)) < 5.4 X 10(-8) and B(B+ -> h(-)mu(+)mu(+)) < 5.8 X 10(-8) are set at the 95% confidence level. These improve the previous best limits by factors of 40 and 30, respectively.text::journal::journal article::research article