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.

16 pages, 4 figures

References in corpus (1)

• Aspects of CP violation in the HZZ coupling at the LHC

Cited by in corpus (15)

• Interpreting the 750 GeV diphoton excess by the singlet extension of the Manohar-Wise Model
• An effective gauge-Higgs operators analysis of new physics associated with the Higgs
• Probing Higgs Boson $CP$ Properties with $t\bar{t}H$ at the LHC and the 100 TeV $pp$ Collider
• LHC constraints on color octet scalars
• Azimuthal Correlations in Top Pair Decays and The Effects of New Heavy Scalars
• Adjoint $SU(5)$ GUT model with $T_7$ flavor symmetry
• Interplay between new physics in one-loop Higgs couplings and the top-quark Yukawa coupling
• $B_{s,d}-{\bar{B}}_{s,d}$ mixings and $B_{s,d}\to {\ell }^{+}{\ell }^{-}$ decays within the Manohar-Wise model
• Top and bottom tensor couplings from a color octet scalar
• Color-octet scalar decays to a gluon and an electroweak gauge boson in the Manohar-Wise model
• Search for New Physics in Rare Top Decays: $t\bar{t}$ Spin Correlations and Other Observables
• SU(5) Octet Scalar at the LHC
• Fingerprinting the contribution of colored scalars to the $H^{+}{W}^{-}Z(\gamma )$ vertex
• Colour Octet Extension of 2HDM
• Leveraging intermediate resonances to probe CP violation at colliders