Searches for new physics using the tt¯ invariant mass distribution in pp collisions at √s=8 TeV

Phys Rev Lett. 2013 Nov 22;111(21):211804. doi: 10.1103/PhysRevLett.111.211804. Epub 2013 Nov 22.


Searches for anomalous top quark-antiquark production are presented, based on pp collisions at √s=8 TeV. The data, corresponding to an integrated luminosity of 19.7 fb(-1), were collected with the CMS detector at the LHC. The observed tt¯ invariant mass spectrum is found to be compatible with the standard model prediction. Limits on the production cross section times branching fraction probe, for the first time, a region of parameter space for certain models of new physics not yet constrained by precision measurements.