scholarly journals Two-loopO(GF2MH4) corrections to the fermionic decay rates of the Higgs boson

1995 ◽  
Vol 51 (9) ◽  
pp. 5007-5015 ◽  
Author(s):  
Loyal Durand ◽  
Bernd A. Kniehl ◽  
Kurt Riesselmann
Keyword(s):  
Higgs Boson ◽  
Decay Rates

scholarly journals Probes for 4th Generation Constituents of Dark Atoms in Higgs Boson Studies at the LHC

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
M. Yu. Khlopov ◽  
R. M. Shibaev
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Big Bang ◽  
Decay Rates ◽  
Neutral Atoms ◽  
Big Bang Nucleosynthesis ◽  
Charged Species ◽  
The Difference ◽  
The Universe ◽  
Direct Dark Matter

The nonbaryonic dark matter of the Universe can consist of new stable charged species, bound in heavy neutral “atoms” by ordinary Coulomb interaction. StableU-(anti-U)quarks of 4th generation, bound in stable colorless(U- U- U-)clusters, are captured by the primordial helium, produced in Big Bang Nucleosynthesis, thus forming neutral “atoms” of O-helium (OHe), a specific nuclear interacting dark matter that can provide solution for the puzzles of direct dark matter searches. However, the existence of the 4th generation quarks and leptons should influence the production and decay rates of Higgs boson and is ruled out by the experimental results of the Higgs boson searches at the LHC, if the Higgs boson coupling to 4th generation fermions is not suppressed. Here, we argue that the difference between the three known quark-lepton families and the 4th family can naturally lead to suppression of this coupling, relating the accelerator test for such a composite dark matter scenario to the detailed study of the production and modes of decay of the 125.5 GeV boson, discovered at the LHC.

scholarly journals Full next-to-leading-order calculations of Higgs boson decay rates in models with non-minimal scalar sectors

2019 ◽  
Vol 949 ◽  
pp. 114791 ◽  
Author(s):  
Shinya Kanemura ◽  
Mariko Kikuchi ◽  
Kentarou Mawatari ◽  
Kodai Sakurai ◽  
Kei Yagyu
Keyword(s):  
Higgs Boson ◽  
Decay Rates ◽  
Leading Order

scholarly journals Lepton Flavor Violation in Economical 3-3-1 Model with Neutrino Singlets

2019 ◽  
Vol 29 (1) ◽  
pp. 87
Author(s):  
Le Tho Hue ◽  
Dinh Phan Khoi ◽  
Hoang Hanh Phuong ◽  
Ha Thanh Hung
Keyword(s):  
Higgs Boson ◽  
Decay Rates ◽  
Higgs Bosons ◽  
Boson Mass ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Charged Higgs ◽  
Charged Leptons ◽  
O 10

Lepton flavor violating (LFV) decays of charged leptons \(\mu\rightarrow e\gamma\)  and SM-like Higgs boson \(h\rightarrow \mu\tau\) are discussed in the framework of the  economical 3-3-1 model  adding three additional singlets neutrinos (E331\(X_R\)). We will show that the appearance of new neutrinos and charged Higgs bosons in this model can result in interesting regions of the parameter space, which satisfy  the recent experimental bound of \(Br(\mu\rightarrow e\gamma)\)  as well as give large \(Br(h\rightarrow \mu\tau)\geq \mathcal{O}(10^{-7})\) . In these regions,  the charged Higgs boson mass lies within the range of \(2-3\) TeV. Our results show that the LFV decays are important channels to distinguish the E331\(X_R\)  and the original economical (E331) models, which predicts suppressed LFV decay rates.

scholarly journals Higgs decay to fermion pairs at NLO in SMEFT

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Jonathan M. Cullen ◽  
Benjamin D. Pecjak
Keyword(s):  
Field Theory ◽  
Higgs Boson ◽  
Effective Field Theory ◽  
Effective Field ◽  
Decay Rates ◽  
Minimal Flavor Violation ◽  
Flavor Violation ◽  
Enhanced Sensitivity ◽  
Higgs Decay ◽  
Perturbative Corrections

Abstract The calculation of next-to-leading order (NLO) perturbative corrections at fixed operator dimension in Standard Model Effective Field Theory (SMEFT) has been a topic of much recent interest. In this paper we obtain the NLO corrections from dimension-6 operators to the Higgs boson decays $$ h\to f\overline{f} $$ h → f f ¯ , where the fermions f ∈ {μ, τ, c}. This extends previous results for $$ h\to b\overline{b} $$ h → b b ¯ to all phenomenologically relevant Higgs boson decays into fermions, and provides the basis for future precision analyses of these decays within effective field theory. We point out the benefits of studying ratios of decay rates into different fermions in SMEFT, the most surprising of which is enhanced sensitivity to anomalous hγγ and hgg couplings induced by flavor-universal SMEFT operators, especially in scenarios where flavor-dependent Wilson coefficients are constrained by Minimal Flavor Violation.

Sign in / Sign up

Export Citation Format

Share Document