Search for Z' resonances decaying to ttbar in dilepton+jets final states in pp collisions at sqrt(s) = 7 TeV

Abstract : A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at sqrt(s) = 7 TeV corresponding to an integrated luminosity of 5.0 inverse femtobarns. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Z' is excluded at the 95% confidence level for resonance masses M[Z'] < 1.3 TeV for Gamma[Z'] = 0.012 M[Z'], and M[Z'] < 1.9 TeV for Gamma[Z'] = 0.10 M[Z'].
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Journal articles
Physical Review D, American Physical Society, 2013, 87, pp.072002. <10.1103/PhysRevD.87.072002>


http://hal.in2p3.fr/in2p3-00752167
Contributor : Florès Sylvie <>
Submitted on : Thursday, November 15, 2012 - 7:00:44 AM
Last modification on : Thursday, November 15, 2012 - 7:00:44 AM

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S. Chatrchyan, M. Besançon, S. Choudhury, F. Couderc, M. Dejardin, et al.. Search for Z' resonances decaying to ttbar in dilepton+jets final states in pp collisions at sqrt(s) = 7 TeV. Physical Review D, American Physical Society, 2013, 87, pp.072002. <10.1103/PhysRevD.87.072002>. <in2p3-00752167>

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