Details
| Original language | English |
|---|---|
| Article number | 180 |
| Journal | JHEP |
| Volume | 2021 |
| Issue number | 1 |
| Publication status | Published - Aug 2020 |
| Externally published | Yes |
Abstract
A general prediction from asymptotically safe quantum gravity is the approximate vanishing of all quartic scalar couplings at the UV fixed point beyond the Planck scale. A vanishing Higgs doublet quartic coupling near the Planck scale translates into a prediction for the ratio between the mass of the Higgs boson M H and the top quark M t. If only the standard model particles contribute to the running of couplings below the Planck mass, the observed M H∼ 125 GeV results in the prediction for the top quark mass M t∼ 171 GeV, in agreement with recent measurements. In this work, we study how the asymptotic safety prediction for the top quark mass is affected by possible physics at an intermediate scale. We investigate the effect of an SU(2) triplet scalar and right-handed neutrinos, needed to explain the tiny mass of left-handed neutrinos. For pure seesaw II, with no or very heavy right handed neutrinos, the top mass can increase to M t ∼ 172.5 GeV for a triplet mass of M ∆ ∼ 10 8GeV. Right handed neutrino masses at an intermediate scale increase the uncertainty of the predictions of M t due to unknown Yukawa couplings of the right-handed neutrinos and a cubic interaction in the scalar potential. For an appropriate range of Yukawa couplings there is no longer an issue of vacuum stability.
Keywords
- Beyond Standard Model, Models of Quantum Gravity, Neutrino Physics, Nonperturbative Effects
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
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In: JHEP, Vol. 2021, No. 1, 180, 08.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Neutrino masses, vacuum stability and quantum gravity prediction for the mass of the top quark
AU - Domènech, Guillem
AU - Goodsell, Mark
AU - Wetterich, Christof
N1 - Publisher Copyright: © 2021, The Author(s).
PY - 2020/8
Y1 - 2020/8
N2 - A general prediction from asymptotically safe quantum gravity is the approximate vanishing of all quartic scalar couplings at the UV fixed point beyond the Planck scale. A vanishing Higgs doublet quartic coupling near the Planck scale translates into a prediction for the ratio between the mass of the Higgs boson M H and the top quark M t. If only the standard model particles contribute to the running of couplings below the Planck mass, the observed M H∼ 125 GeV results in the prediction for the top quark mass M t∼ 171 GeV, in agreement with recent measurements. In this work, we study how the asymptotic safety prediction for the top quark mass is affected by possible physics at an intermediate scale. We investigate the effect of an SU(2) triplet scalar and right-handed neutrinos, needed to explain the tiny mass of left-handed neutrinos. For pure seesaw II, with no or very heavy right handed neutrinos, the top mass can increase to M t ∼ 172.5 GeV for a triplet mass of M ∆ ∼ 10 8GeV. Right handed neutrino masses at an intermediate scale increase the uncertainty of the predictions of M t due to unknown Yukawa couplings of the right-handed neutrinos and a cubic interaction in the scalar potential. For an appropriate range of Yukawa couplings there is no longer an issue of vacuum stability.
AB - A general prediction from asymptotically safe quantum gravity is the approximate vanishing of all quartic scalar couplings at the UV fixed point beyond the Planck scale. A vanishing Higgs doublet quartic coupling near the Planck scale translates into a prediction for the ratio between the mass of the Higgs boson M H and the top quark M t. If only the standard model particles contribute to the running of couplings below the Planck mass, the observed M H∼ 125 GeV results in the prediction for the top quark mass M t∼ 171 GeV, in agreement with recent measurements. In this work, we study how the asymptotic safety prediction for the top quark mass is affected by possible physics at an intermediate scale. We investigate the effect of an SU(2) triplet scalar and right-handed neutrinos, needed to explain the tiny mass of left-handed neutrinos. For pure seesaw II, with no or very heavy right handed neutrinos, the top mass can increase to M t ∼ 172.5 GeV for a triplet mass of M ∆ ∼ 10 8GeV. Right handed neutrino masses at an intermediate scale increase the uncertainty of the predictions of M t due to unknown Yukawa couplings of the right-handed neutrinos and a cubic interaction in the scalar potential. For an appropriate range of Yukawa couplings there is no longer an issue of vacuum stability.
KW - Beyond Standard Model
KW - Models of Quantum Gravity
KW - Neutrino Physics
KW - Nonperturbative Effects
UR - http://www.scopus.com/inward/record.url?scp=85100244577&partnerID=8YFLogxK
U2 - 10.1007/JHEP01(2021)180
DO - 10.1007/JHEP01(2021)180
M3 - Article
VL - 2021
JO - JHEP
JF - JHEP
IS - 1
M1 - 180
ER -