Baringer, Philip S.Bean, AliceBenelli, GabrieleKenny, R. P., IIIMurray, Michael J.Noonan, DannySanders, Stephen J.Stringer, Robert W.Wood, Jeffrey ScottChatrchyan, S.Khachatryan, V.Sirunyan, A. M.Tumasyan, A.Adam, W.Bergauer, T.Dragicevic, M.2014-11-122014-11-122013-11-22S. Chatrchyan et al. (CMS Collaboration). (2013). "Searches for new physics using the tt-bar invariant mass distribution in pp collisions at s√=8  TeV." Physical Review Letters, 111(21):211804. http://dx.doi.org/10.1103/PhysRevLett.111.211804.0031-9007https://hdl.handle.net/1808/15720This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.211804.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-bar 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.Article10.1103/PhysRevLett.111.211804https://orcid.org/0000-0002-3932-3769openAccess