Results 131 to 140 of about 172,277 (268)
Neutrino-Mass Hierarchies and Non-linear Representation of Lepton-Flavour Symmetry
, 2008 Lepton-flavour symmetry in the Standard Model is broken by small masses for charged leptons and neutrinos. Introducing neutrino masses via dimension-5 operators associated to lepton-number violation at a very high scale, the corresponding coupling matrix
B. Pontecorvo +4 more
core +2 more sources
Delbrück Scattering above the Pair Production Threshold: Going beyond the Born Approximation
Annalen der Physik, Volume 536, Issue 3, March 2024.This article presents an accurate approach for the calculation of Delbrück scattering amplitudes above the electron–positron pair production threshold that accounts for the Coulomb interaction with nucleus to all orders in αZ$\alpha Z$. Explicit calculations for the scattering of 2.754 MeV photons by zinc, cerium, lead, and plutonium nuclei are ...
Jonas Sommerfeldt +2 more
wiley +1 more source
Leptonic CP violation and Wolfenstein parametrization for lepton mixing
Physics Letters B, 2014 We investigate a general structure of lepton mixing matrix resulting from the SU$_F$(3) gauge family model with an appropriate vacuum structure of SU$_F$(3) symmetry breaking. It is shown that the lepton mixing matrix can be parametrized by using the Wolfenstein parametrization method to characterize its deviation from the tri-bimaximal mixing.
Liu, Zhuo, Wu, Yue-Liang
openaire +3 more sources
Mass hierarchy of leptons and hadrons within the framework of electrodynamics [PDF]
arXiv, 1999 Structure of leptons and hadrons within the framework of electrodynamics is considered. Muon and tau-lepton have the structure of 3 electrons. The mass of muon is defined by the section of two-photon annihilation. The mass of tau-lepton is defined by the section of three-photon annihilation.
arxiv
Diffusion of charm quarks in jets in high-energy heavy-ion collisions
European Physical Journal C: Particles and Fields, 2019 The radial distribution of $$D^0$$ D0 mesons in jets probes the diffusion of charm quark relative to the jet axis and provides a new perspective to study the interaction mechanisms between heavy quarks and the medium in the nucleus-nucleus collisions ...
Sa Wang +3 more
doaj +1 more source
Direct CP violation in semi-leptonic and leptonic decays [PDF]
arXiv, 1999 We show that direct CP violation in semi-leptonic and leptonic decays can occur in multi-Higgs doublet extensions of the electroweak standard model with flavor changing neutral currents. For pion and lepton decays these $CP$ violating effects cannot be constrained directly by experimental data since up to now the branching ratio of the decays $\pi ...
arxiv
K0-K¯0 Mixing in the Minimal Flavor-Violating Two-Higgs-Doublet Models
Advances in High Energy Physics, 2017 The two-Higgs-doublet model (2HDM), as one of the simplest extensions of the Standard Model (SM), is obtained by adding another scalar doublet to the SM and is featured by a pair of charged Higgs, which could affect many low-energy processes.
Natthawin Cho +3 more
doaj +1 more source
European Physical Journal C: Particles and Fields, 2019 In this work, we pave the way to calculate the productions of $$\omega $$ ω and $$K^0_{\mathrm{S}}$$ KS0 mesons with large $$p_T$$ pT in p+p and A+A collisions both at RHIC and LHC.
Guo-Yang Ma +3 more
doaj +1 more source
Lepton-Flavor Violating Decay of Tau Lepton in the Supersymmetric Seesaw Model [PDF]
arXiv, 2002 Now the bounds on the lepton-flavor violating (LFV) decay modes of tau lepton are being improved by the Belle experiment in the KEK B factory. In this paper the LFV decay of tau lepton is discussed in the supersymmetric seesaw model, using the current neutrino oscillation data.
arxiv
Rare Kaon Decay Experiments at CERN
, 2013 The NA62 experiment at the CERN SPS aims to measure the branching ratio of the rare decay $K^+\to\pi^+\nu\bar\nu$ with a relative precision of $\sim10%$.
Goudzovski, Evgueni
core +1 more source