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Search for a light pseudoscalar Higgs boson in the dimuon decay channel in pp collisions at √s=7TeV

par Chatrchyan, Serguei;Clerbaux, Barbara ;De Lentdecker, Gilles ;Gay, Arnaud ;Hreus, Tomas ;Leonard, Alexandre ;Charaf, Othman ;Marage, Pierre ;Reis, Thomas ;Thomas, Laurent ;Vander Velde, Catherine ;Vanlaer, Pascal ;Wang, Jian ;Dero, Vincent ; [et al.]
Référence Physical review letters, 109, 12, 121801
Publication Publié, 2012

Article révisé par les pairs

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Résumé :

The dimuon invariant mass spectrum is searched in the range between 5.5 and 14GeV 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 1.3fb -1 collected in pp collisions at √s=7TeV 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 σ×B(pp→a→μ +μ -) in the range of 1.5-7.5pb. These results improve on existing bounds on the abb̄ coupling for m am Υ(3S). Constraints on the supersymmetric parameter space are presented in the context of the next-to-minimal model.