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

Xiao-Gang He, German Valencia, Hiroshi Yokoya

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We consider the phenomenology of CP violation in a color-octet extended scalar sector for t t¯t¯ production and decay at the LHC. In particular we study the effect of the two neutral color-octet scalars SI and SR that occur in the model. There are two new sources of CP violation: a phase in the couplings of SI,R to top-quarks; and two phases in the quartic couplings of the scalar potential. In resonant production of a single SI,R followed by its decay into t t¯t¯ pairs through the parton level process gg → SI,R → t t¯t¯ , we find large raw CP asymmetries which can reach 12%. These raw asymmetries are, of course, diluted by standard model (SM) t t¯t¯ pairs making observation of CP violation contingent on whether the resonance itself can be extracted from the SM background.
Original languageEnglish
Article number30
Number of pages17
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - Dec 2011
Externally publishedYes


  • Higgs Physics
  • Heavy Quark Physics
  • CP violation

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