The double charged Higgs bosons,
Δ
±±, are one of the benchmarks of left-right symmetric models. We discuss their production and demonstrate that even for small values of the
Δ
++
l
−
l
− coupling, ...they would produce observable signals at muon colliders.
Neutrino Physics Barenboim, G
arXiv.org,
04/2015
Paper, Journal Article
Odprti dostop
The Standard Model has been incredibly successful in predicting the outcome of almost all the experiments done up so far. In it, neutrinos are mass-less. However, in recent years we have accumulated ...evidence pointing to tiny masses for the neutrinos (as compared to the charged leptons). These masses allow neutrinos to change their flavour and oscillate. In these lectures I review the properties of neutrinos in and beyond the Standard Model.
Lepton charge asymmetries can be used as an alternative means of searching for new physics. They are interesting because they are small in the Standard Model and therefore, necessarily evidence new ...physics. In this work we explore the use of lepton asymmetries as a probe of the flavour structure of the left-right symmetric model with spontaneous CP violation. We find that new physics may enhance the magnitude of
a
SL up to the present level within the appropriate parameter space.
Only three flavours Barenboim, Gabriela; Scheck, Florian
Physics letters. B,
11/1998, Letnik:
440, Številka:
3
Journal Article
Recenzirano
Odprti dostop
It is shown that it is possible to account for all the experimental indications for neutrino oscillations with just three flavours. In particular we suggest that the atmospheric neutrino anomaly and ...the LSND result can be explained by the same mass difference and mixing. Possible implications and future test of the resulting mass and mixing pattern are given.
It is commonly believed that unbroken supersymmetry (SUSY) implies that all members of a supermultiplet have the same mass. We demonstrate that this is not true, by exhibiting a simple ...counterexample. We employ the formalism of homeotic fermions, in a simple model where CPT conjugate fermions have different masses. This model can be supersymmetrized to a hypermultiplet of fields which form a representation of the conventional N=2 SUSY algebra. Nevertheless, CPT conjugate states in this hypermultiplet have different masses. These surprising results do not violate either the CPT theorem or the Haag–Lopuszański–Sohnius theorem.
We investigate the potential impact of neutrino quantum decoherence on the precision measurements of standard neutrino oscillation parameters in the DUNE and T2HK experiments. We show that the ...measurement of \(\delta_\text{CP}\), \(\sin^2\theta_{13}\) and \(\sin^2\theta_{23}\) is stronger effected in DUNE than in T2HK. On the other hand, DUNE would have a better sensitivity than T2HK to observe decoherence effects. By performing a combined analysis of DUNE and T2HK we show that a robust measurement of standard parameters would be possible, which is not guaranteed with DUNE data alone.
We study the contribution of two-body meson-exchange processes to axial-charge transitions using relativistic models of the nucleus. We conduct calculations at the mean-field and oneloop levels for ...nuclei in the lead region and also for tin and oxygen. The aim is to provide a comprehensive one-body plus two-body treatment within the relativistic framework. The results indicate that one- and two-body processes enhance the matrix elements of the axial-charge operator by some (70 ± 20) % in all three regions studied, in good qualitative agreement with the data and more conventional calculations. We also discuss the sensitivities of the calculation to the change in some of the couplings and the parameters involved.
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