# Search for Same-Sign Top-Quark Pair Production at sqrt(s) = 7 TeV and Limits on Flavour Changing Neutral Currents in the Top Sector

7 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : An inclusive search for same-sign top-quark pair production in pp collisions at sqrt(s) = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 inverse picobarns. This analysis is motivated by recent studies of p p-bar to t t-bar reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t-channel exchange of a massive neutral vector boson (Z'). Models with such a Z' also predict enhancement of same-sign top-pair production in pp or p p-bar collisions. Limits are set as a function of the Z'mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00641347
Contributor : Claudine Bombar <>
Submitted on : Tuesday, November 15, 2011 - 2:55:16 PM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

### Citation

S. Chatrchyan, D. Sillou, M. Besancon, S. Choudhury, M. Dejardin, et al.. Search for Same-Sign Top-Quark Pair Production at sqrt(s) = 7 TeV and Limits on Flavour Changing Neutral Currents in the Top Sector. Journal of High Energy Physics, Springer, 2011, 8, pp.005. ⟨10.1007/JHEP08(2011)005⟩. ⟨in2p3-00641347⟩

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