On the metastability of the Standard Model vacuum

Isidori, Gino; Ridolfi, Giovanni; Струмиа, Алессандро

doi:10.1016/s0550-3213(01)00302-9

Cited by 456 publications

(727 citation statements)

References 41 publications

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“…On the one hand, O(1) values for the new coupligs y 4,5,6,7 can cause desirable modifications to Higgs physics, but clearly the larger these couplings are the faster the Higgs quartic will run negative. As an example, if we take the values y 4 = y 5 = 0 and y 6 = y 7 = 1 and a threshold at the vector-like mass scale of M = 800 GeV, we find that the Higgs quartic vanishes at the scale 2 TeV, while it can be metastable up to scales of order 3 TeV, where we have used the results of [69] to estimate the metastability bound.…”

Section: Custodial Modelmentioning

confidence: 98%

Higgs couplings and precision electroweak data

Batell

Gori

Wang

2013

J. High Energ. Phys.

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In light of the discovery of a Higgs-like particle at the LHC, we revisit the status of the precision electroweak data, focusing on two discrepant observables: 1) the long-standing 2.4σ deviation in the forward-backward asymmetry of the bottom quark A b F B , and 2) the 2.3σ deviation in R b , the ratio of the Z → bb partial width to the inclusive hadronic width, which is now in tension after a recent calculation including new two-loop electroweak corrections. We consider possible resolutions of these discrepancies. Taking the data at face value, the most compelling scenario is that new physics directly affects A b F B and R b , bringing the prediction into accord with the measured values. We propose a modified 'Beautiful Mirrors' scenario which contains new vector-like quarks that mix with the b quark, modifying the Zbb vertex and thus correcting A b F B and R b . We show that this scenario can lead to modifications to the production rates of the Higgs boson in certain channels, and in particular a sizable enhancement in the diphoton channel. We also describe additional collider tests of this scenario.The ATLAS and CMS experiments have recently discovered a new boson with properties closely resembling those of the Standard Model (SM) Higgs boson [1,2]. The focus of the experimental collaborations now turns to determining the properties of this state, such as its quantum numbers and its couplings to other SM particles. This is an extremely important task since any deviation from the SM Higgs boson predictions will unambiguously point to new physics (NP) at the TeV scale. In this respect it is intriguing that both experiments observe a slight enhancement in the h → γγ channel, though with the current dataset this enhancement is not statistically significant [3, 4].If, as the current data suggest, this new state is indeed the Higgs boson, its mass m h ∼ 125 GeV will be in accord with the expectation indirectly suggested by the precision electroweak data, which favors a light SMlike Higgs boson. Of the many precision measurements used to test the electroweak sector, most of them are in good agreement with the SM predictions, see for example [5],[6], [7]. However, there are a couple of notable discrepancies. The forward-backward asymmetry of the bottom quark A b F B measured at the Z-pole at LEP1 constitutes a long-standing exception. The measured value and SM prediction are [5], [7],and thus exhibit a 2.4σ discrepancy. Furthermore, a recent calculation of R b , the ratio of the Z → bb partial width to the inclusive hadronic width, which includes new two-loop electroweak corrections, now puts the prediction in tension with the measured value [8]. The measurement and prediction read [5], [7],displaying a 2.3σ discrepancy.It is a matter of debate whether these deviations call for NP. Among a large ensemble of measurements, such as that used in the electroweak fit, one may expect an occasional discrepancy of this size, which could be the result of a statistical fluctuation or unknown systematic error. However, a possib...

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Section: Custodial Modelmentioning

confidence: 98%

Higgs couplings and precision electroweak data

Batell

Gori

Wang

2013

J. High Energ. Phys.

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“…Several physical interpretations of this scale are possible: first, we can require that the Higgs potential be stable at all scales. New degrees of freedom would then have to appear below or at 10 10 GeV, changing the renormalization group evolution, and rendering the potential stable [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. We review one such approach based on a Higgs portal with a scalar dark matter candidate in the appendix [49,50].…”

Section: Jhep04(2015)022mentioning

confidence: 99%

“…For the formation of a Bubble of size ∼ R one should evaluate the scale dependent potential at the scale k ∼ 1/R [97,98]. In the situation we are interested in, the field values where the potential starts to be lower than the electroweak vacuum near zero vev are quite large.…”

Section: B Tunnellingmentioning

confidence: 99%

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The Higgs mass and the scale of new physics

Eichhorn

Gies

Jaeckel

et al. 2015

J. High Energ. Phys.

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In view of the measured Higgs mass of 125 GeV, the perturbative renormalization group evolution of the Standard Model suggests that our Higgs vacuum might not be stable. We connect the usual perturbative approach and the functional renormalization group which allows for a straightforward inclusion of higher-dimensional operators in the presence of an ultraviolet cutoff. In the latter framework we study vacuum stability in the presence of higher-dimensional operators. We find that their presence can have a sizable influence on the maximum ultraviolet scale of the Standard Model and the existence of instabilities. Finally, we discuss how such operators can be generated in specific models and study the relation between the instability scale of the potential and the scale of new physics required to avoid instabilities.

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“…When the LEP-2 accelerator at CERN closed down finally on November 3, 2000, it had produced slightly more events that are compatible with being due to the decay of Higgs bosons with a rest mass of m H = 115 +0. 7 −0.5 GeV (1) than expected from background processes [2,3]. If the Higgs boson mass, m H and the top quark mass m t do not satisfy the approximate relationship…”

Section: Introductionmentioning

confidence: 99%

New physics beyond the standard model of particle physics and parallel universes

Plaga¹

2006

Physics Letters B

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It is shown that if -and only if -"parallel universes" exist, an electroweak vacuum that is expected to have decayed since the big bang with a high probability might exist. It would neither necessarily render our existence unlikely nor could it be observed. In this special case the observation of certain combinations of Higgsboson and top-quark masses -for which the standard model predicts such a decaycannot be interpreted as evidence for new physics at low energy scales. The question of whether parallel universes exist is of interest to our understanding of the standard model of particle physics.

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On the metastability of the Standard Model vacuum

Cited by 456 publications

References 41 publications

Higgs couplings and precision electroweak data

Higgs couplings and precision electroweak data

The Higgs mass and the scale of new physics

New physics beyond the standard model of particle physics and parallel universes

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