Colour octet extension of 2HDM

Valencia, G.

doi:10.1142/s0217751x16300337

Cited by 2 publications

(2 citation statements)

References 39 publications

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“…The advantage of such an approach is that bounds can easily be reinterpreted in different, possibly ultravioletcomplete, theoretical frameworks [17,[28][29][30]. On the other hand, early four-top LHC Run 2 results from the ATLAS collaboration [31] have also been reinterpreted, this time to constrain a pseudoscalar sgluon model [32].…”

Section: Introductionmentioning

confidence: 99%

Cornering sgluons with four-top-quark events

2018

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The existence of colour-octet scalar states, often dubbed sgluons, is predicted in many extensions of the Standard Model of particle physics, such as supersymmetric realisations featuring Dirac gauginos. Such states have a large pair-production rate at hadron colliders and mainly decay into pairs of jets and top quarks. Consequently, they represent a primary target for experimental searches for new resonances in the multijet and multitop channels at the Large Hadron Collider. Adopting a phenomenologically-motivated simplified model, we reinterpret the results of a recent experimental search for the four-top-quark Standard Model signal, from which we constrain the sgluon mass to be larger than about 1.06 TeV. We additionally consider how modifications of the existing four-topquark studies could enhance our ability to unravel the presence of scalar octets in data.

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Section: Introductionmentioning

confidence: 99%

Cornering sgluons with four-top-quark events

2018

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“…In order to have Yukawa couplings with SM quarks, a sextuplet must have non-zero electric charge. Octuplets that are doublets of SU (2) have been considered in the literature as well [15][16][17] with experimental constraints discussed e.g. in [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Vacuum stability and perturbativity of SU(3) scalars

Heikinheimo

Kannike

Lyonnet

et al. 2017

J. High Energ. Phys.

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Abstract:We calculate the vacuum stability conditions and renormalisation group equations for the extensions of standard model with a higher colour multiplet scalar up to the representation 15 that leaves the strong interaction asymptotically free. In order to find the vacuum stability conditions, we calculate the orbit spaces for the self-couplings of the higher multiplets, which for the representations 15 and 15 of SU(3) c are highly complicated. However, if the scalar potential is linear in orbit space variables, it is sufficient to know the convex hull of the orbit space. Knowledge of the orbit spaces also facilitates the minimisation of the potentials. In contrast to the self-couplings of other multiplets, we find that the scalar quartic couplings of the representations 3 and 8 walk rather than run, remaining nearly constant and perturbative over a vast energy range. We describe the conditions for walking couplings using a schematic model. With these technical results at hand we revise earlier results of generation of new scales with large SU(3) c scalar multiplets. Our results are easily extendable to models of new physics with additional SU(3) or SU(N ) gauge symmetries.

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Colour octet extension of 2HDM

Abstract: In this talk we consider some aspects of the Manohar-Wise extension of the SM with a colour-octet electroweak-doublet scalar applied to 2HDM. We present theoretical constraints on the parameters of this extension to both the SM and the 2HDM and discuss related phenomenology at LHC.

Cited by 2 publications

References 39 publications

Cornering sgluons with four-top-quark events

Cornering sgluons with four-top-quark events

Vacuum stability and perturbativity of SU(3) scalars

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