Results 11 to 20 of about 1,127,445 (273)
Journal of High Energy Physics, 2021 We investigate the new contributions to the parameters g L and g R of the Zb b ¯ $$ Zb\overline{b} $$ vertex in a multi-Higgs-doublet model (MHDM). We emphasize that those contributions generally worsen the fit of those parameters to the experimental ...
Darius Jurčiukonis, Luís Lavoura
doaj +1 more source
Long-lived sterile neutrinos at Belle II in effective field theory
Journal of High Energy Physics, 2022 Large numbers of τ leptons are produced at Belle II. These could potentially decay into sterile neutrinos that, for the mass range under consideration, are typically long-lived, leading to displaced-vertex signatures.
Guanghui Zhou +4 more
doaj +1 more source
Cosmological parameter constraints using phenomenological symbolic expressions: On the significance of symbolic expression complexity and accuracy [PDF]
Phys. Rev. D 108, 043539 (2023), 2023 Phenomenological models are widely used in cosmology in relation to constraining different cosmological models, with two common examples being cosmographic expansions and modeling the equation-of-state parameter of dark energy. This work presents a study of how using different phenomenological expressions for observables and physical quantities versus ...
arxiv +1 more source
Simplified TeV leptophilic dark matter in light of DAMPE data
Journal of High Energy Physics, 2018 Using a simplified framework, we attempt to explain the recent DAMPE cosmic e + + e − flux excess by leptophilic Dirac fermion dark matter (LDM). The scalar (Φ0) and vector (Φ1) mediator fields connecting LDM and Standard Model particles are discussed ...
Guang Hua Duan +5 more
doaj +1 more source
Probing Higgs couplings to light quarks via Higgs pair production
Journal of High Energy Physics, 2019 We consider the potential of the Higgs boson pair production process to probe the light quark Yukawa couplings. We show within an effective theory description that the prospects of constraining enhanced first generation light quark Yukawa couplings in ...
Lina Alasfar +2 more
doaj +1 more source
Expectations for the muon g − 2 in simplified models with dark matter
Journal of High Energy Physics, 2017 We investigate simplified models of new physics that can accommodate the measured value of the anomalous magnetic moment of the muon and the relic density of dark matter.
Kamila Kowalska, Enrico Maria Sessolo
doaj +1 more source
Determination of the possible quantum numbers for the newly observed Ξ b (6227)0 state
Journal of High Energy Physics, 2021 The LHCb Collaboration recently reported the observation of a new excited bottom baryon Ξ b (6227)0 and announced an improvement in the measurements related to the previously observed Ξ b (6227) − state.
K. Azizi, Y. Sarac, H. Sundu
doaj +1 more source
More models for lepton mixing with four constraints
Journal of High Energy Physics, 2019 We propose new lepton-mixing textures that may be enforced through well-defined symmetries in renormalizable models. Each of our textures has four sum rules for the neutrino mass observables.
Darius Jurčiukonis, Luís Lavoura
doaj +1 more source
Likelihood analysis of the flavour anomalies and g – 2 in the general two Higgs doublet model
Journal of High Energy Physics, 2022 We present a likelihood analysis of the general two Higgs doublet model, using the most important currently measured flavour observables, in view of the anomalies in charged current tree-level and neutral current one-loop rare decays of B mesons in b ...
Peter Athron +5 more
doaj +1 more source
Phenomenology of the little flavon model [PDF]
Phys.Rev. D70 (2004) 013002, 2004 The phenomenology of the little-flavon model is discussed. Flavor changing neutral current and lepto-quark compositeness set the most stringent bounds to the lowest possible value for the scale at which the flavons arise as pseudo-Goldstone bosons.
arxiv +1 more source