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Searches for anomalous top quark-antiquark production are presented, based onpp collisions at sqrt(s) = 8 TeV. The data, corresponding to an integratedluminosity of 19.7 inverse femtobarns, were collected with the CMS detector atthe LHC. The observed ttbar invariant mass spectrum is found to be compatiblewith the standard model prediction. Limits on the production cross sectiontimes branching fraction probe, for the first time, a region of parameter spacefor certain models of new physics not yet constrained by precisionmeasurements.

Searches for new physics using the ttbar invariant mass distribution in pp collisions at sqrt(s)=8 TeV