Color-octet scalars and potentially large CP violation at the LHC

Details Color-octet scalars and potentially large CP violation at the LHC Color-octet scalars and potentially large CP violation at the LHC

2011-10-12

arxiv.org/abs/1110.2588v1

JHEP 1112 (2011) 030

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 4 figures

Scientific paper

10.1007/JHEP12(2011)030

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.

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