Search for same-sign top-quark pair production at root s=7 TeV and limits on flavour changing neutral currents in the top sector
CMS Collaboration (ukupan broj autora: 2210)
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An inclusive search for same-sign top-quark pair production in pp collisions at root s = 7 TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 pb(-1). This analysis is motivated by recent studies of p (p) over bar - GT t (t) over 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 pp 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.
Source:Journal of High Energy Physics, 2011, 8
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