Color-octet scalars and potentially large CP violation at the LHC
Abstract
We consider the phenomenology of CP violation in a color-octet extended scalar sector for t\bar{t} production and decay at the LHC. In particular we study the effect of the two neutral color-octet scalars S_I and S_R that occur in the model. There are two new sources of CP violation: a phase in the couplings of S_{I,R} to top-quarks; and two phases in the quartic couplings of the scalar potential. In resonant production of a single S_{I,R} followed by its decay into t\bar{t} pairs through the parton level process gg to S_{I,R} to t\bar{t}, we find large raw CP asymmetries which can reach 12%. These raw asymmetries are, of course, diluted by standard model (SM) t\bar{t} pairs making observation of CP violation contingent on whether the resonance itself can be extracted from the SM background.
Cite
@article{arxiv.1110.2588,
title = {Color-octet scalars and potentially large CP violation at the LHC},
author = {Xiao-Gang He and German Valencia and Hiroshi Yokoya},
journal= {arXiv preprint arXiv:1110.2588},
year = {2012}
}
Comments
16 pages, 4 figures