Search for same-sign top-quark pair production at 脰s = 7 \sqrt {s} = 7 TeV and limits on flavour changing neutral cur
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摘要
An inclusive search for same-sign top-quark pair production in pp collisions at 脰s = 7 \sqrt {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 \textp[`(\textp)] 庐 \textt[`(\textt)] \text{p}\bar{\text{p}} \to \text{t}\bar{\text{t}} 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 \textp[`(\textp)] \text{p}\bar{\text{p}} 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.

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