Addendum to: Search for anomalous top-gluon couplings at LHC revisited

TL;DR

This paper discusses how CMS measurements of top-antitop production cross sections at the LHC can improve constraints on nonstandard top-gluon couplings, building on previous theoretical work.

Contribution

It presents the first CMS measurement of the top-antitop cross section relevant for constraining anomalous top-gluon couplings, demonstrating the potential for LHC data to surpass Tevatron constraints.

Findings

CMS measurement enables tighter constraints on top-gluon couplings.

LHC data provides stronger limits than Tevatron.

First experimental application of these theoretical constraints.

Abstract

In our latest paper "Search for anomalous top-gluon couplings at LHC revisited" in Eur. Phys. J. C65 (2010), 127-135 (arXiv:0910.3049 [hep-ph]), we studied possible effects of nonstandard top-gluon couplings through the chromoelectric and chromomagnetic moments of the top quark using the total cross section of ppbar/pp --> ttbar X at Tevatron/LHC. There we pointed out that LHC data could give a stronger constraint on those two parameters, which would be hard to obtain from Tevatron data alone. We show here the first CMS measurement of this cross section actually makes it possible.