Pitfalls of iterative pole mass calculation in electroweak multiplets

McKay, James; Scott, Pat; Athron, Peter

doi:10.1140/epjp/i2018-12250-4

Cited by 10 publications

(6 citation statements)

References 59 publications

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“…This bound is very sensitive to the lifetime of the charged triplet component, which itself depends on the mass splitting of the charged and neutral components of the triplet. The lifetime of fermionic multiplets decaying due to radiative mass splitting has been found to change significantly when performing a two-loop mass splitting calculation [58,59]. In the fermionic case, the mass splitting decreases and the lifetime goes up, which is favourable for the reach of disappearing track searches.…”

Section: Disappearing Tracksmentioning

confidence: 99%

Two-step electroweak symmetry-breaking: theory meets experiment

Bell

Dolan

Friedrich

et al. 2020

J. High Energ. Phys.

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We study the phenomenology of a hypercharge-zero SU(2) triplet scalar whose existence is motivated by two-step electroweak symmetry-breaking. We consider both the possibility that the triplets are stable and contribute to the dark matter density, or that they decay via mixing with the standard model Higgs boson. The former is constrained by disappearing charged track searches at the LHC and by dark matter direct detection experiments, while the latter is constrained by existing multilepton collider searches. We find that a two-step electroweak phase transition involving a stable triplet with a negative quadratic term is ruled out by direct detection searches, while an unstable triplet with a mass less than 230 GeV is excluded at 95% confidence level.

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Section: Disappearing Tracksmentioning

confidence: 99%

Two-step electroweak symmetry-breaking: theory meets experiment

Bell

Dolan

Friedrich

et al. 2020

J. High Energ. Phys.

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“…Of course, the custodial symmetry is only approximate, being explicitly broken by coupling to U (1) Y gauge bosons. In the case of Minimal Dark Matter, one-loop electroweak corrections induce splittings O(100 MeV) between the components of a multiplet such that the neutral state of a multiplet with Y = 0 is always the lightest component, and so is potentially a dark matter candidate [1], see also [39] for a recent discussion. Once non-zero Yukawa couplings between different representations are considered, there are more possibilities as, away from the custodial points, mass splittings between components are obtained already at tree level.…”

Section: Charged States and Su (2) Multiplets Structurementioning

confidence: 99%

On Minimal Dark Matter coupled to the Higgs

Lopez-Honorez

Tytgat

Tziveloglou

et al. 2018

J. High Energ. Phys.

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We provide a unified presentation of extensions of the Minimal Dark Matter framework in which new fermionic electroweak multiplets are coupled to each other via the Standard Model Higgs doublet. We study systematically the generic features of all the possibilities, starting with a singlet and two doublets (akin to Bino-Higgsino dark matter) up to a Majorana quintuplet coupled to two Weyl quadruplets. We pay special attention to this last case, since it has not yet been discussed in the literature. We estimate the parameter space for viable dark matter candidates. This includes an estimate for the mass of a quasi-pure quadruplet dark matter candidate taking into account the Sommerfeld effect. We also argue how the coupling to the Higgs can bring the Minimal Dark Matter scenario within the reach of present and future direct detection experiments. ContentsA Generators of SU (2) and other useful formulas 34 B Cross-sections for two-particle states in SU (2) symmetric limit 35Einasto or Navarro-Frenk-White (NFW) profiles for the dark matter distribution in the Galaxy. This is because of the Sommerfeld effect, which typically enhances the annihilation cross section of MDM candidates at small relative velocities, giving rise to strong gammaray spectral features, see [11][12][13] for the wino case and [14,15] for the quintuplet. 2 Notice that on general grounds, dark matter bound state formation [16][17][18][19][20] could also affect the dark matter annihilation. It has been shown that the latter effect is expected to be relevant for quintuplet dark matter, while it is negligible in the case of the triplet [21,22]. In general, the wino-like dark matter appears now strongly disfavoured by current indirect detection searches [23] while the quintuplet could be tested by very near future HESS-II data release on searches for gamma-ray lines from the 10 years Galactic Center data [24].Because of the advent of these constraints, it may be timely to consider possible variations around the MDM framework, which at the same time may lead to a broader range of possible DM candidates. As mentioned above, a basic assumption of this framework is that there is one and only one electroweak multiplet. This, in particular, precludes Yukawa coupling to the SM Higgs doublet for fermionic candidates. 3 A natural yet simple variation on the MDM framework is to consider simultaneously different multiplets, in particular fermionic representations that differ by isospin ∆I = 1/2, that allows for "integrating the Higgs portal to fermion DM" [26]. A familiar instance is the neutralino of the Minimal Supersymmetric Standard Model (MSSM), which is generically a mixture of bino/higgsino/wino complex. Recently, there have been much studies of DM candidates from mixed (as compared to pure) representations: singlet-doublet (∼ bino-higgsino) [26-33] (see also [34] for the case of a Dirac singlet), doublet-triplet (∼ higgsino-wino) [26,35,36] and triplet-quadruplet [33,37].In the present work, we complete this panorama by adding to this list the case of tw...

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“…The gauge dependence of the electroweakino masses determined by the iterative method has been discussed in[56].…”

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confidence: 99%

Gauge dependences of higher-order corrections to NMSSM Higgs boson masses and the charged Higgs Decay $${H^{\pm } \rightarrow W^\pm h_{i}}$$

et al. 2020

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In this paper we compute the electroweak corrections to the charged Higgs boson decay into a W boson and a neutral Higgs boson in the CP-conserving NMSSM. We calculate the process in a general R ξ gauge and investigate the dependence of the loop-corrected decay width on the gauge parameter ξ. The gauge dependence arises from the mixing of different loop orders. Phenomenology requires the inclusion of mass and mixing corrections to the external Higgs bosons in order to match the experimentally measured mass values. As a result, we move away from a strict one-loop calculation and consequently mix orders in perturbation theory. Moreover, determination of the loop-corrected masses in an iterative procedure also results in the mixing of different loop orders. Gauge dependence then arises from the mismatch with tree-level Goldstone boson couplings that are applied in the loop calculation, and from the gauge dependence of the loop-corrected masses themselves. We find that the gauge dependence is significant. *

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Pitfalls of iterative pole mass calculation in electroweak multiplets

Cited by 10 publications

References 59 publications

Two-step electroweak symmetry-breaking: theory meets experiment

Two-step electroweak symmetry-breaking: theory meets experiment

On Minimal Dark Matter coupled to the Higgs

Gauge dependences of higher-order corrections to NMSSM Higgs boson masses and the charged Higgs Decay $${H^{\pm } \rightarrow W^\pm h_{i}}$$

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