Zobrazeno 1 - 10
of 297
pro vyhledávání: '"Yagyu, Kei"'
We propose a new renormalization scheme in the two Higgs doublet models with a softly-broken $Z_2$ symmetry and CP-conservation in the Higgs sector. In this scheme, counterterms for mixing angles of the Higgs bosons are determined by using the decay
Externí odkaz:
http://arxiv.org/abs/2408.08033
Autor:
Nomura, Takaaki, Yagyu, Kei
We discuss multi-$Z'$ signatures coming from decays of Higgs bosons in models with a spontaneously broken $U(1)'$ symmetry, which can be observed as "lepton jets" or multi-lepton final states depending on the mass range of new bosons. We consider ano
Externí odkaz:
http://arxiv.org/abs/2407.20742
In models with non-minimal Higgs sectors, enforcing (near) Higgs alignment, necessary to prevent significant deviations in the Higgs boson coupling from the standard model prediction, causes a serious fine-tuning problem. We demonstrate that the Higg
Externí odkaz:
http://arxiv.org/abs/2404.06096
Publikováno v:
Physics Letters B, Volume 855, 2024, 138843
We discuss the Higgs phenomenology in models with a new $U(1)_X$ gauge symmetry including the $U(1)_{B-L}$ scenario, where three right-handed neutrinos are inevitably introduced due to the gauge anomaly cancellations. We find that the decay branching
Externí odkaz:
http://arxiv.org/abs/2402.00392
We propose a novel signature with four-photon final states to probe CP-violating (CPV) extended Higgs sectors via $f \bar{f} \to Z^* \to H_1H_2 \to 4 \gamma$ processes with $H_{1,2}$ being additional neutral Higgs bosons. We focus on the nearly Higgs
Externí odkaz:
http://arxiv.org/abs/2308.01772
In ordinary thermodynamics, around first-order phase transitions, the intensive parameters such as temperature and pressure are automatically fixed to the phase transition point when one controls the extensive parameters such as total volume and tota
Externí odkaz:
http://arxiv.org/abs/2307.11420
Publikováno v:
JHEP 06 (2023) 069
We discuss CP-violation in a model with a real and a complex isospin triplet Higgs fields without introducing any symmetries except for the electroweak gauge symmetry. This corresponds to the minimal extension of the Higgs sector with the following p
Externí odkaz:
http://arxiv.org/abs/2303.09294
We propose a new mechanism which simultaneously explains tiny neutrino masses, stability of dark matter and baryon asymmetry of the Universe via leptogenesis due to the common origin: a spontaneous breaking of a $U(1)_X$ gauge symmetry at TeV scale.
Externí odkaz:
http://arxiv.org/abs/2303.00417
Publikováno v:
JHEP02(2023)237
We discuss scenarios with wrong-sign (WS) Yukawa couplings for the discovered Higgs boson in the Yukawa-aligned two Higgs doublet model. In the WS scenario, Yukawa couplings for down-type quarks and/or charged leptons have an opposite sign as compare
Externí odkaz:
http://arxiv.org/abs/2211.08803
Publikováno v:
Phys. Rev. D 106, 055035 (2022)
The CDF II experiment has recently determined the mass of the $W$ boson to be $m_W(\text{CDF II}) = 80.4335 \pm 0.0094~$GeV, which deviates from the standard model prediction at $7\sigma$ level. Although this new result is in tension with other exper
Externí odkaz:
http://arxiv.org/abs/2204.12898