Search for same-sign top-quark pair production at sqrt {s} = 7 TeV and limits on flavour changing neutral currents in the top sector
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 pb-1. This analysis is motivated by recent studies of 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 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.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- August 2011
- DOI:
- 10.1007/JHEP08(2011)005
- arXiv:
- arXiv:1106.2142
- Bibcode:
- 2011JHEP...08..005C
- Keywords:
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- Hadron-Hadron Scattering;
- High Energy Physics - Experiment
- E-Print:
- Replaced with published version