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

CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; et al; Chiochia, V; Kilminster, B; Robmann, P (2013). Searches for new physics using the tt¯ invariant mass distribution in pp collisions at s√=8 TeV. Physical Review Letters, 111(21):211804.

## Abstract

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.

## Abstract

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.

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