Strong first order electroweak phase transition in the CP-conserving 2HDM revisited

Basler, Philipp; Krause, Marcel; Mühlleitner, Margarete; Wittbrodt, Jonas; Wlotzka, Alexander

doi:10.1007/jhep02(2017)121

Cited by 164 publications

(173 citation statements)

References 152 publications

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“…(v) It is well known that one-loop corrections to the quartic couplings can be very large in some regions of the 2HDM parameter space [97,98]. As these are then used in the matching procedure, large deviations are to be expected in the one-loop matching procedure [99,100] compared to the values obtained via treelevel matching. Therefore, substantial phenomenological differences in individual choices of parameters may be expected, but again, an overall analysis of the parameter space will yield mostly the same trends in terms of scale validity and mass bounds.…”

Section: Two-loop Running One-loop Matchingmentioning

confidence: 99%

High scale impact in alignment and decoupling in two-Higgs-doublet models

et al. 2018

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The two-Higgs-doublet model (2HDM) provides an excellent benchmark to study physics beyond the Standard Model (SM). In this work, we discuss how the behavior of the model at high-energy scales causes it to have a scalar with properties very similar to those of the SM-which means the 2HDM can be seen to naturally favor a decoupling or alignment limit. For a type II 2HDM, we show that requiring the model to be theoretically valid up to a scale of 1 TeV, by studying the renormalization group equations (RGE) of the parameters of the model, causes a significant reduction in the allowed magnitude of the quartic couplings. This, combined with B-physics bounds, forces the model to be naturally decoupled. As a consequence, any nondecoupling limits in type II, like the wrong-sign scenario, are excluded. On the contrary, even with the very constraining limits for the Higgs couplings from the LHC, the type I model can deviate substantially from alignment. An RGE analysis similar to that made for type II shows, however, that requiring a single scalar to be heavier than about 500 GeV would be sufficient for the model to be decoupled. Finally, we show that the 2HDM is stable up to the Planck scale independently of which of the CP-even scalars is the discovered 125 GeV Higgs boson.

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Section: Two-loop Running One-loop Matchingmentioning

confidence: 99%

High scale impact in alignment and decoupling in two-Higgs-doublet models

et al. 2018

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“…We are doing this at the one-loop level using a similar ansatz as in Ref. [38] for the THDM. The CTs are fixed by the following renormalisation conditions:…”

Section: On-shell Renormalisationmentioning

confidence: 99%

Perturbativity constraints in BSM models

Krauss¹,

Staub

2018

Eur. Phys. J. C

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Phenomenological studies performed for nonsupersymmetric extensions of the Standard Model usually use tree-level parameters as input to define the scalar sector of the model. This implicitly assumes that a full on-shell calculation of the scalar sector is possible -and meaningful. However, this doesn't have to be the case as we show explicitly at the example of the Georgi-Machacek model. This model comes with an appealing custodial symmetry to explain the smallness of the ρ parameter. However, the model cannot be renormalised on-shell without breaking the custodial symmetry. Moreover, we find that it can often happen that the radiative corrections are so large that any consideration based on a perturbative expansion appears to be meaningless: counter-terms to quartic couplings can become much larger than 4π and/or two-loop mass corrections can become larger than the one-loop ones. Therefore, conditions are necessary to single out parameter regions which cannot be treated perturbatively. We propose and discuss different sets of such perturbativity conditions and show their impact on the parameter space of the Georgi-Machacek model. Moreover, the proposed conditions are general enough that they can be applied to other models as well. We also point out that the vacuum stability constraints in the Georgi-Machacek model, which have so far only been applied at the tree level, receive crucial radiative corrections. We show that large regions of the parameter space which feature a stable electroweak vacuum at the loop level would have been -wrongly -ruled out by the tree-level conditions.

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“…The relation between Lagrangian scalar couplings and pole masses in the 2HDM is discussed e.g. in Refs [16,19,23,[29][30][31][32][33]…”

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confidence: 99%

On two-loop corrections to the Higgs trilinear coupling in models with extended scalar sectors

Braathen

Kanemura

2019

Physics Letters B

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The Higgs trilinear coupling λ hhh is of great importance to understand the structure of the Higgs sector and allows searching for indirect signs of Beyond-the-Standard-Model (BSM) physics, even if new states are somehow hidden. In particular, in models with extended Higgs sectors, it is known that non-decouplings effects in BSM-scalar contributions at one loop can cause λ hhh to deviate significantly from its SM prediction, raising the question of what happens at two loops. We review here our calculation [1, 2] of the leading two-loop corrections to λ hhh in an aligned scenario of a Two-Higgs-Doublet Model. We find their typical size to be 10-20% of the one-loop corrections, meaning that they do not modify significantly the one-loop non-decoupling effects, but are not entirely negligible either. I. INTRODUCTIONThe discovery of the 125-GeV Higgs boson at the CERN LHC in 2012 has been a great success for particle physics, and has completed the particle spectrum of the Standard Model (SM). However, while it is now established that the Higgs sector is responsible for the electroweak symmetry breaking (EWSB), very little is known about the nature of the Higgs potential -in fact, only its minimum and the curvature around the minimum are known. Moreover, although some new physics must exist -possibly not too far from the electroweak (EW) scale -to address shortcomings of the SM, there is so far no clear sign of it in experiments. A first possible explanation for this could be that new physics only exists beyond the scale currently accessible at colliders, and hence their effects would be (almost) impossible to find. Another interesting possibility would be that the new states are made somehow difficult to observe via some symmetry or mechanism.A prime example of the latter is alignment [3], which is defined for models of several Higgs doublets as the limit in which the total EW vacuum expectation value (VEV) is colinear in field a Speaker.

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Strong first order electroweak phase transition in the CP-conserving 2HDM revisited

Cited by 164 publications

References 152 publications

High scale impact in alignment and decoupling in two-Higgs-doublet models

High scale impact in alignment and decoupling in two-Higgs-doublet models

Perturbativity constraints in BSM models

On two-loop corrections to the Higgs trilinear coupling in models with extended scalar sectors

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