Running of fermion observables in non-supersymmetric SO(10) models

Ohlsson, Tommy; Pernow, Marcus

doi:10.1007/jhep11(2018)028

Cited by 24 publications

(21 citation statements)

References 45 publications

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“…Throughout this paper, we will focus on the non-supersymmetric case whenever we discuss specific examples. For discussions of the phenomenological viability of minimal non-supersymmetric SO(10) models see, e.g., [106][107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122]. If an extension of the Reuter fixed point to the supersymmetric GUT setting should exist, see [123], our discussion would carry over to that case.…”

Section: Jhep08(2020)111mentioning

confidence: 99%

Predictive power of grand unification from quantum gravity

Eichhorn

Held

Wetterich

2020

J. High Energ. Phys.

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If a grand-unified extension of the asymptotically safe Reuter fixed-point for quantum gravity exists, it determines free parameters of the grand-unified scalar potential. All quartic couplings take their fixed-point values in the trans-Planckian regime. They are irrelevant parameters that are, in principle, computable for a given particle content of the grand unified model. In turn, the direction of spontaneous breaking of the grand-unified gauge symmetry becomes predictable. For the flow of the couplings below the Planck mass, gauge and Yukawa interactions compete for the determination of the minimum of the effective potential.

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Section: Jhep08(2020)111mentioning

confidence: 99%

Predictive power of grand unification from quantum gravity

Eichhorn

Held

Wetterich

2020

J. High Energ. Phys.

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“…As neutrino data became available to the level of precision that allowed fits to be made, the initial attempts to accommodate neutrino masses and leptonic mixing parameters were performed for SUSY models [11][12][13][14][15][16] with the type-I or type-II seesaw mechanism, or a mixture thereof. There have also been numerous fits of the Yukawa sector of various non-SUSY models with type-I seesaw [17][18][19][20][21][22][23], with the conclusion that these fits are possible depending on the specifics of the Yukawa sector and the symmetry breaking pattern. Furthermore, fits with type-II seesaw or a combination of types I and II seesaw have been considered in non-SUSY scenarios [24,25], which concluded that models with type-II seesaw only do not yield acceptable fits, but that type-II seesaw in combination with type-I seesaw provides good fits.…”

Section: Introductionmentioning

confidence: 99%

Fits to non-supersymmetric SO(10) models with type I and II seesaw mechanisms using renormalization group evolution

Ohlsson

Pernow

2019

J. High Energ. Phys.

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We consider numerical fits to non-supersymmetric SO(10)-based models in which neutrino mass is generated by the type-I or type-II seesaw mechanism or a combination of both.The fits are performed with a sophisticated top-down procedure, taking into account the renormalization group equations of the gauge and Yukawa couplings, integrating out relevant degrees of freedom at their corresponding mass scales, and using recent data for the Standard Model observables. We find acceptable fits for normal neutrino mass ordering only and with neutrino mass generated by either type-I seesaw only or a combination of types I and II seesaw in which type-I seesaw is dominant. Furthermore, we find predictions from the best fit regarding the small neutrino masses, the effective neutrinoless double beta decay mass, and the leptonic CP-violating phase. Finally, we show that the fits are rather insensitive to the chosen value of the unification scale. * tohlsson@kth.se † pernow@kth.se arXiv:1903.08241v2 [hep-ph] 19 Jun 2019 from M GUT to M Z , a complete analysis should integrate out the right-handed neutrinos at their respective mass scales, which has been carried out in Refs. [18,23]. Other works either performed the fits at M GUT or assumed that all right-handed neutrinos were integrated out simultaneously during the RG evolution.In this work, we consider fits to non-SUSY SO(10) models with neutrino mass being generated by either the type-I or type-II seesaw mechanism or a combination of both, similar to Ref. [25]. The procedure used is similar to that of Ref. [18], which involves sampling the parameters of the models at M GUT , evolving them down to M Z using the RGEs, and comparing the resulting values to data of the observables. The novelty of this work is the combination of the type-I and type-II seesaw mechanisms with a proper and complete treatment of the RG evolution, including integrating out right-handed neutrinos at their respective mass scales. Furthermore, we use updated data for all fermion observables. This paper is structured as follows. First, in Sec. II, we present the model that we investigate and the origin of the seesaw mechanism in SO(10). Next, in Sec. III, we describe how the parameters of this model are related to those of the SM. Then, in Sec. IV, we discuss the parametrization and the numerical procedure used. Finally, in Sec. V, we present the results before summarizing our findings and concluding in Sec. VI. II. MODELThe model that we consider is a non-SUSY SO(10) model with each generation of fermions and right-handed neutrinos belonging to a 16 F representation, whereas the Higgs scalars reside in the 10 H and 126 H representations. We also introduce a global U(1) PQ symmetry which has a double purpose. Firstly, it solves the strong CP problem and provides the QCD axions [26][27][28][29]. Secondly, and more importantly for the Yukawa sector, it allows us to complexify the real 10 H representation without introducing additional couplings [30], as described in Sec. II A.We assume that the SO(10) symmetr...

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“…Models based on a Pati-Salam intermediate symmetry have been investigated extensively in the literature [10,35,47,[67][68][69][70][71][72]. In this work, we follow the model described in Ref.…”

Section: No Intermediate Symmetrymentioning

confidence: 99%

Threshold effects in SO(10) models with one intermediate breaking scale

2020

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Despite the successes of the Standard Model of particle physics, it is known to suffer from a number of deficiencies. Several of these can be addressed within non-supersymmetric theories of grand unification based on $$\text {SO}(10)$$ SO ( 10 ) . However, achieving gauge coupling unification in such theories is known to require additional physics below the unification scale, such as symmetry breaking in multiple steps. Many such models are disfavored due to bounds on the proton lifetime. Corrections arising from threshold effects can, however, modify these conclusions. We analyze all seven relevant breaking chains with one intermediate symmetry breaking scale, assuming the “survival hypothesis” for the scalar masses. Two are allowed by proton lifetime and two are disfavored by a failure to unify the gauge couplings. The remaining three unify at a too low scale, but can be salvaged by various amounts of threshold corrections. We parametrize this and thereby rank the models by the size of the threshold corrections required to save them.

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Running of fermion observables in non-supersymmetric SO(10) models

Cited by 24 publications

References 45 publications

Predictive power of grand unification from quantum gravity

Predictive power of grand unification from quantum gravity

Fits to non-supersymmetric SO(10) models with type I and II seesaw mechanisms using renormalization group evolution

Threshold effects in SO(10) models with one intermediate breaking scale

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