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Nucleation at Finite Temperature: A Gauge-Invariant Perturbative Framework.
Phys Rev Lett
June 2023
Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
We present a gauge-invariant framework for bubble nucleation in theories with radiative symmetry breaking at high temperature. As a procedure, this perturbative framework establishes a practical, gauge-invariant computation of the leading order nucleation rate, based on a consistent power counting in the high-temperature expansion. In model building and particle phenomenology, this framework has applications such as the computation of the bubble nucleation temperature and the rate for electroweak baryogenesis and gravitational wave signals from cosmic phase transitions.
View Article and Find Full Text PDFThe-reflection symmetry of Majorana neutrinos.
Rep Prog Phys
June 2023
Center of High Energy Physics, Peking University, Beijing 100871, People's Republic of China.
The observed pattern of lepton flavor mixing and CP violation strongly indicates the possible existence of a simple flavor symmetry in the neutrino sector-the effective Majorana neutrino mass term keeps invariant when the three left-handed neutrino fields transform asνeL→(νeL)c,νμL→(ντL)candντL→(νμL)c. A direct application of such a-reflection symmetry to the canonical seesaw mechanism can help a lot to constrain the flavor textures of active and sterile Majorana neutrinos. The present article is intended to summarize the latest progress made in exploring the properties of this minimal flavor symmetry, its translational and rotational extensions, its soft breaking effects via radiative corrections from a superhigh energy scale to the electroweak scale, and its various phenomenological implications.
View Article and Find Full Text PDFPrecise predictions for double-Higgs production via vector-boson fusion.
Eur Phys J C Part Fields
November 2020
Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge, CB3 0HE UK.
Theoretical predictions with next-to-next-to-leading order (NNLO) QCD accuracy combined with the next-to-leading order (NLO) electroweak (EW) corrections are presented for differential observables of the double-Higgs production process via vector-boson fusion. While the QCD corrections were previously known, the EW ones are computed here for the first time. The numerical results are obtained for a realistic experimental set-up at the LHC and are presented in the form of fiducial cross sections and differential distributions.
View Article and Find Full Text PDFThe Constrained NMSSM with right-handed neutrinos.
Eur Phys J C Part Fields
April 2018
6Institute for International Collaboration, Hokkaido University, Sapporo, 060-0815 Japan.
In this article, we demonstrate that the inclusion of right-handed neutrino superfields in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) makes it possible to impose universality conditions on the soft supersymmetry-breaking parameters at the Grand Unification scale, alleviating many of the problems of the so-called Constrained NMSSM. We have studied the renormalization group equations of this model, showing that right-handed neutrinos greatly contribute to driving the singlet Higgs mass-squared parameter negative, which makes it considerably easier to satisfy the conditions for radiative electroweak symmetry breaking. The new fields also lead to larger values of the Standard Model Higgs mass, thus making it easier to reproduce the measured value.
View Article and Find Full Text PDFBeam polarization effects on top-pair production at the ILC.
Eur Phys J C Part Fields
May 2018
4Nikhef, Science Park 105, 1098 XG Amsterdam, The Netherlands.
Full one-loop electroweak corrections for an process associated with sequential decay are discussed. At the one-loop level, the spin-polarization effects of the initial electron and positron beams are included in the total and differential cross sections. A narrow-width approximation is used to treat the top-quark production and decay while including full spin correlations between them.
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