Jožef Stefan Institute

About: Jožef Stefan Institute is a facility organization based out in Ljubljana, Slovenia. It is known for research contribution in the topics: Liquid crystal & Dielectric. The organization has 3828 authors who have published 12614 publications receiving 291025 citations.

Probing the seesaw mechanism at CERN LHC

Abstract: We have recently proposed a simple SU(5) theory with an adjoint fermionic multiplet on top of the usual minimal spectrum. This leads to the hybrid scenario of both type I and type III seesaw and it predicts the existence of the fermionic SU(2) triplet between 100 GeV and 1 TeV for a conventional grand unified theory scale of about ${10}^{16}\text{ }\text{ }\mathrm{GeV}$, with main decays into $W$ ($Z$) and leptons, correlated through Dirac Yukawa couplings, and lifetimes shorter than about ${10}^{\ensuremath{-}12}\mathrm{sec} $. These decays are lepton number violating and they offer an exciting signature of $\ensuremath{\Delta}L=2$ dilepton events together with 4 jets at future $pp$ ($p\overline{p}$) colliders. Increasing the triplet mass endangers the proton stability and so the seesaw mechanism could be directly testable at LHC.

Dzyaloshinsky-Moriya anisotropy in the spin-1/2 kagome compound ZnCu3(OH)6Cl2.

Abstract: We report the determination of the Dzyaloshinsky-Moriya interaction, the dominant magnetic anisotropy term in the kagome spin-1/2 compound ${\mathrm{ZnCu}}_{3}(\mathrm{OH}{)}_{6}{\mathrm{Cl}}_{2}$. Based on the analysis of the high-temperature electron spin resonance (ESR) spectra, we find its main component $|{D}_{z}|=15(1)\text{ }\text{ }\mathrm{K}$ to be perpendicular to the kagome planes. Through the temperature dependent ESR linewidth, we observe a building up of nearest-neighbor spin-spin correlations below $\ensuremath{\sim}150\text{ }\text{ }\mathrm{K}$.