TY  - JOUR
AU  - Eberhardt, O.
AU  - Miralles, V.
AU  - Pich, A.
PY  - 2021
DA  - 2021//
TI  - Constraints on coloured scalars from global fits
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 123
EP  - 23pp
VL  - 10
IS  - 10
PB  - Springer
KW  - Beyond Standard Model
KW  - Higgs Physics
AB  - We consider a simple extension of the electroweak theory, incorporating one SU(2)(L) doublet of colour-octet scalars with Yukawa couplings satisfying the principle of minimal flavour violation. Using the HEPfit package, we perform a global fit to the available data, including all relevant theoretical constraints, and extract the current bounds on the model parameters. Coloured scalars with masses below 1.05 TeV are already excluded, provided they are not fermiophobic. The mass splittings among the different (charged and CP-even and CP-odd neutral) scalars are restricted to be smaller than 20 GeV. Moreover, for scalar masses smaller than 1.5 TeV, the Yukawa coupling of the coloured scalar multiplet to the top quark cannot exceed the one of the SM Higgs doublet by more than 80%. These conclusions are quite generic and apply in more general frameworks (without fine tunings). The theoretical requirements of perturbative unitarity and vacuum stability enforce relevant constraints on the quartic scalar potential parameters that are not yet experimentally tested.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2106.12235
UR  - https://doi.org/10.1007/JHEP10(2021)123
DO  - 10.1007/JHEP10(2021)123
LA  - English
N1  - WOS:000708483600001
ID  - Eberhardt_etal2021
ER  -