Abstract
We analyze the constraints on coloured scalar bosons imposed by the current LHC data at $\sqrt{s}=13$ TeV. Specifically, we consider an additional electroweak doublet of colour-octet 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.
Highlights
The discovery of the Higgs boson by the ATLAS and CMS Collaborations [1,2] can be understood not just like the confirmation of the mechanism for generating the masses of the Standard Model (SM) particles but like the discovery of the first element of a possible more extended scalar sector
The current data are compatible with the SM, there remain many unanswered fundamental questions which motivate the existence of new physics (NP)
We focus on the other possibility, scalar extensions in which we add a color-octet electroweak doublet satisfying the principle of minimal flavor violation (MFV), the so-called Manohar and Wise (MW) model [11]
Summary
The discovery of the Higgs boson by the ATLAS and CMS Collaborations [1,2] can be understood not just like the confirmation of the mechanism for generating the masses of the Standard Model (SM) particles but like the discovery of the first element of a possible more extended scalar sector. The phenomenological requirement that ρ − 1 must be very small, ≤ Oð10−3Þ, selects SUð2ÞL singlets and doublets as the preferred scalar candidates, while unwanted FCNCs are usually avoided introducing some ad hoc discrete symmetry that forces each type of SM righthanded fermion to couple only to a single scalar doublet This guarantees that all Yukawa matrices are diagonal in the mass basis and keeps the resulting flavor structure stable under quantum corrections (natural flavor conservation) [3]. We focus on the other possibility, scalar extensions in which we add a color-octet electroweak doublet satisfying the principle of MFV, the so-called Manohar and Wise (MW) model [11]. We focus on the associated production of neutral and charged scalars with heavy quarks that was not considered in previous analyses With these searches, we are able to cover some regions of the parameter space that have not been studied before.
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