LHC constraints on color octet scalars

We analyze the constraints on coloured scalar bosons imposed by the current LHC data at √ s = 13 TeV. Specifically, we consider an additional electroweak doublet of colouroctet scalars, satisfying the principle of Minimal Flavour Violation in order to fulfill the stringent experimental limits on flavour-changing neutral currents. We demonstrate that coloured scalars with masses below 800 GeV are already excluded, provided they are not fermiophobic. *

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“…However, the limits obtained from this channel are still not better than those obtained for √ s = 8 TeV in Ref. [70].…”

Section: Introductioncontrasting

confidence: 53%

“…The most stringent limits on the direct production of these scalars come from Ref. [70], where the single and pair production of neutral scalars was studied. The recent release of high-luminosity experimental searches for massive resonances decaying into heavy quarks [72][73][74][75] makes now possible to improve those bounds.…”

Section: Introductionmentioning

confidence: 99%

LHC bounds on colored scalars

Miralles

Pich

2019

Phys. Rev. D

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“…Concerning the scalar messengers, we have two pairs of these, the σ a ∼ ð8; 1; 0Þ, which are singlets under SUð2Þ L , and the η a , which transform as weak doublets, η a ∼ ð8; 2; 1=2Þ. As color octets, these would also be copiously produced at a hadron collider of sufficient energy [28]. However, their masses are expected to lie well above the reach of the LHC.…”

Section: Color Octets At Hadron Collidersmentioning

confidence: 99%

Bound-state dark matter and Dirac neutrino masses

et al. 2018

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We propose a simple theory for the idea that cosmological dark matter (DM) may be present today mainly in the form of stable neutral hadronic thermal relics. In our model, neutrino masses arise radiatively from the exchange of colored DM constituents, giving a common origin for both dark matter and neutrino mass. The exact conservation of B − L symmetry ensures dark matter stability and the Dirac nature of neutrinos. The theory can be falsified by dark matter nuclear recoil direct detection experiments, leading also to possible signals at a next generation hadron collider.

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“…In addition, direct searches for ± are also performed by the Tevatron [51], ATLAS [52], and CMS [53] experiments, among which most constraints depend strongly on the underling Yukawa structures. Recently, by comparing the cross-sections for the dijet, top-pair, dijet-pair, , and production at the LHC with the strongest available experimental limits from ATLAS or CMS at 8 or 13 TeV, Hayreter, and Valencia [54] has extracted constraints on the parameter space of the ManoharWise model [24], which is equivalent to type C 2HDM discussed here. Interestingly, they found that masses below 1 TeV have not been excluded for color-octet scalars as is often claimed in the literature.…”

Section: Results In the 2hdms With Mfvmentioning

confidence: 99%

K0-K¯0 Mixing in the Minimal Flavor-Violating Two-Higgs-Doublet Models

Cho

et al. 2017

Advances in High Energy Physics

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The two-Higgs-doublet model (2HDM), as one of the simplest extensions of the Standard Model (SM), is obtained by adding another scalar doublet to the SM and is featured by a pair of charged Higgs, which could affect many low-energy processes. In the "Higgs basis" for a generic 2HDM, only one scalar doublet gets a nonzero vacuum expectation value and, under the criterion of minimal flavor violation, the other one is fixed to be either color-singlet or color-octet, which are named as type III and type C 2HDM, respectively. In this paper, we study the charged-Higgs effects of these two models on the 0 − 0 mixing, an ideal process to probe New Physics (NP) beyond the SM. Firstly, we perform a complete one-loop computation of the box diagrams relevant to the 0 − 0 mixing, keeping the mass and momentum of the external strange quark up to the second order. Together with the up-to-date theoretical inputs, we then give a detailed phenomenological analysis, in the cases of both real and complex Yukawa couplings of the charged Higgs to quarks. The parameter spaces allowed by the current experimental data on the mass difference Δ 퐾 and the CP-violating parameter 퐾 are obtained and the differences between these two 2HDMs are investigated, which are helpful to distinguish them from each other from a phenomenological point of view.

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LHC constraints on color octet scalars

Cited by 31 publications

References 58 publications

LHC bounds on colored scalars

LHC bounds on colored scalars

Bound-state dark matter and Dirac neutrino masses

K0-K¯0 Mixing in the Minimal Flavor-Violating Two-Higgs-Doublet Models

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