@article{3153805, title = "Search for a Light Pseudoscalar Higgs Boson in the Dimuon Decay Channel in pp Collisions at root s=7 TeV", author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and and Adam, W. and Bergauer, T. and Dragicevic, M. and Eroe, J. and and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. M. and and Hammer, J. and Hoermann, N. and Hrubec, J. and Jeitler, M. and and Kiesenhofer, W. and Knuenz, V. and Krammer, M. and Liko, D. and Mikulec, and I. and Pernicka, M. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and and Schoefbeck, R. and Strauss, J. and Taurok, A. and Wagner, P. and and Waltenberger, W. and Walzel, G. and Widl, E. and Wulz, C-E. and and Mossolov, V. and Shumeiko, N. and Gonzalez, J. Suarez and Bansal, S. and and Cornelis, T. and De Wolf, E. 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A. and Ross, I. and Savin, A. and Smith, W. H. and Swanson, and J. and CMS Collaboration and Kailas, S and Barbone, L", journal = "Physical Review and Physical Review Letters Index", year = "2012", volume = "109", number = "12", publisher = "AMER PHYSICAL SOC", issn = "0094-0003", doi = "10.1103/PhysRevLett.109.121801", abstract = "The dimuon invariant mass spectrum is searched in the range between 5.5 and 14 GeV for a light pseudoscalar Higgs boson a, predicted in a number of new physics models, including the next-to-minimal supersymmetric standard model. The data sample used in the search corresponds to an integrated luminosity of 1: 3 fb(-1) collected in pp collisions at root s = 7 TeV with the CMS detector at the LHC. No excess is observed above the background predictions and upper limits are set on the cross section times branching fraction sigma x B(pp -> a -> mu(+) mu(-)) in the range of 1.5-7.5 pb. These results improve on existing bounds on the ab (b) over bar coupling for m(a) < m(gamma(1s)) and are the first significant limits for m(a) > m(gamma(3S)). Constraints on the supersymmetric parameter space are presented in the context of the next-to-minimal model." }