A blind analysis searching for the decay B-s(0) -> mu(+)mu(-) has been performed using proton-proton collisions at a centre-of-mass energy of 7 TeV recorded with the ATLAS detector at the LHC. With an integrated luminosity of 2.4 fb(-1) no excess of events over the background expectation is found and an upper limit is set on the branching fraction BR(B-s(0) -> mu(+)mu(-)) <2.2(1.9) x 10(-8) at 95% (90%) confidence level. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved. RI semprini cesari, nicola/G-7817-2012; Petrucci, Fabrizio/G-8348-2012; Livan, Michele/D-7531-2012; Smirnov, Sergei/F-1014-2011; Wemans, Andre/A-6738-2012; Jones, Roger/H-5578-2011; Ferrando, James/A-9192-2012; Fazio, Salvatore /G-5156-2010; Fabbri, Laura/H-3442-2012; Villa, Mauro/C-9883-2009; de Groot, Nicolo/A-2675-2009; valente, paolo/A-6640-2010; Takai, Helio/C-3301-2012; Delmastro, Marco/I-5599-2012

Search for the decay B-s(0) -> mu(+)mu(-) with the ATLAS detector