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H.Brown, H.Buechler-Germann, A.Burducea, I.Bursche, A.Buytaert, J.Cadeddu, S.Callot, O.Calvi, M.Calvo Gomez, M.Camboni, A.Campana, P.Carbone, A.Carboni, G.Cardinale, R.Cardini, A.Carranza-Mejia, H.Carson, L.Carvalho Akiba, K.Casse, G.Cattaneo, M.Cauet, Ch.Charles, M.Charpentier, Ph.Chen, P.Chiapolini, N.Chrzaszcz, M.Ciba, K.Cid Vidal, X.Ciezarek, G.Clarke, P. E. L.Clemencic, M.Cliff, H. V.Closier, J.Coca, C.Coco, V.Cogan, J.Cogneras, E.Collins, P.Comerma-Montells, A.Contu, A.Cook, A.Coombes, M.Corti, G.Couturier, B.Cowan, G. A.Craik, D.Cunliffe, S.Currie, R.D'Ambrosio, C.David, P.David, P. N. Y.De Bonis, I.De Bruyn, K.De Capua, S.De Cian, M.De Miranda, J. M.De Paula, L.De Simone, P.Decamp, D.Deckenhoff, M.Degaudenzi, H.Del Buono, L.Deplano, C.Derkach, D.Deschamps, O.Dettori, F.Di Canto, A.Dickens, J.Dijkstra, H.Diniz Batista, P.Dogaru, M.Domingo Bonal, F.Donleavy, S.Dordei, F.Dornan, P.Dosil Suarez, A.Dossett, D.Dovbnya, A.Dupertuis, F.Dzhelyadin, R.Dziurda, A.Dzyuba, A.Easo, S.Egede, U.Egorychev, V.Eidelman, S.Van Eijk, D.Eisenhardt, S.Ekelhof, R.Eklund, L.El Rifai, I.Elsasser, Ch.Elsby, D.Falabella, A.Faerber, C.Fardell, G.Farinelli, C.Farry, S.Fave, V.Fernandez Albor, V.Ferreira Rodrigues, F.Ferro-Luzzi, M.Filippov, S.Fitzpatrick, C.Fontana, M.Fontanelli, F.Forty, R.Francisco, O.Frank, M.Frei, C.Frosini, M.Furcas, S.Gallas Torreira, A.Galli, D.Gandelman, M.Gandini, P.Gao, Y.Garofoli, J.Garosi, P.Tico, J. GarraGarrido, L.Gaspar, C.Gauld, R.Gersabeck, E.Gersabeck, M.Gershon, T.Ghez, Ph.Gibson, V.Gligorov, V. V.Goebel, C.Golubkov, D.Golutvin, A.Gomes, A.Gordon, H.Grabalosa Gandara, M.Graciani Diaz, R.Cardoso, L. A. 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C.Zhang, Y.Zhelezov, A.Zhong, L.Zvyagin, A.2013-03-282013-03-282013-03-28201310.1103/PhysRevLett.110.021801https://infoscience.epfl.ch/handle/20.500.14299/90906WOS:000313162700003A search for the rare decays B-s(0) -> mu(+) mu(-) and B-s(0) -> mu(+) mu-is performed with data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1 fb(-1) of proton-proton collisions at root s = 8 TeV and 1.0 fb(-1) at root s = 7 TeV. We observe an excess of B-s(0) -> mu(+) mu-candidates with respect to the background expectation. The probability that the background could produce such an excess or larger is 5.3 x 10(-4) corresponding to a signal significance of 3.5 standard deviations. A maximum-likelihood fit gives a branching fraction of B(B-s(0) -> mu(+) mu(-)) = (3.2(-1.2)(+1.5)) x 10(-9), where the statistical uncertainty is 95% of the total uncertainty. This result is in agreement with the standard model expectation. The observed number of B-s(0) -> mu(+) mu-candidates is consistent with the background expectation, giving an upper limit of B(B-s(0) -> mu(+) mu(-)) < 9.4 x 10(-10) at 95% confidence level. DOI: 10.1103/PhysRevLett.110.021801text::journal::journal article::research article