Considering a fermionic dark matter model in which the hidden sector is connected to the Standard Model by an additional Higgs doublet field, the mediator dark Z boson may live long enough. We explore the possibility to observe the displaced vertices of the long-lived dark Z boson at the ...
An independent result for the two loop fermionic contributions to the muon lifetime in the Standard Model is obtained and slight deviations in the prediction of the W boson mass are found with respect to [Phys. Lett. B 495 (2000) 338; Nucl. Phys. B 632 (2002) 189]. Supplied with the...
The blue box represents a four-quark effective vertex containing the contribution of the W boson and radiative corrections as seen in Eq. (21). We work in the factorization approximation which amounts to evaluate the hadron matrix elements of the effective Hamiltonian as a product of two quark...
We investigate the dependence of the weak angle ϑ W and the proton lifetime τ p on the structure of the Higgs sector in the SU(5) model of grand unification. It is remarkable that only a small number of low dimensional scalar multipl... ...
published 26 September 2007 We consider hot-carrier inelastic scattering due to electron-electron interactions in graphene as functions of carrier energy and density. We calculate the imaginary part of the zero-temperature quasiparticle self-energy for doped graphene utilizing the G 0 W and random pha...
These fits required remarkably few force constants; furthermore, it was found that all interaction parameters remained essentially constant, except for the quadrupole term X π and the boson number N π which varied linearly with the neutron number....
In this paper, we introduce the formalism to examine the impact of the dark scalar sector to the conformal and the electroweak symmetries breaking in the sense of formation of the scalar boson star (BS). The BS is presented by the local scalar field containing the Higgs boson field and the...
superfluid 4Hetemperature dependenceelectronic mobilityelectron lifetime/ A6740 Boson degeneracy and superfluidity of helium-4The lifetime of electrons deposited on the liquid surface of 4He was measured. It is smaller than 8 μs at 0.5 K and, as is concluded from its temperature dependence, ...
Lifetimes of yrast states in the rare-earth midshell isotopes W176,178,180 have been measured with fast-timing methods using the Cologne iron-free Orange spectrometer and the Cologne HORUS spectrometer and with the recoil distance Doppler shift method using the Cologne coincidence plunger setup. ...
The new lifetime values in γγ -coincidence and γ -single mode are compared with the results of former experiments. Recent predictions of the Interacting Boson Model with Configuration Mixing, the Symmetry Conserving Configuration Mixing model based on the Hart...