2,032 research outputs found
Neutrino Physics, Lepton Flavour Violation and the LHC
We briefly review flavour violation in the lepton sector: starting from
neutrino oscillations and their implications, we consider several charged
lepton flavour violating observables at high and low energies. We present new
physics models and discuss the r\^ole of the latter in disentangling them. In
particular, we show how the interplay of different observables allows to derive
important information on the underlying mechanism of lepton flavour violation.
As an example, we discuss the impact of a type-I SUSY seesaw concerning lepton
flavour violation at low energies and at colliders (LHC and a future Linear
Collider).Comment: 10 pages, 11 figures. Plenary talk at the 25th Rencontres de Blois on
Particle Physics and Cosmology, Blois, France, 26-31 May 2013 1 reference
adde
A scenario for leptogenesis at the TeV scale
We propose a scenario of thermal leptogenesis at the TeV scale in the context
of an extension of the Standard Model with 4 generations. We also add one
right-handed Majorana neutrino for each generation to generate left handed
neutrino masses via see-saw. The r\^{o}le of the fourth lepton doublet is not
much different from that of a supersymmetric partner, so the leptogenesis
consequences of a four generation scenario are indicators of a more generic
picture. We obtain a value for the baryon asymmetry of the
Universe in accordance with observations by solving the full set of coupled
Boltzmann equations for this model.Comment: 4 pages, 2 figures, late
Effective Lagrangian with vector mesons : Linear response theory
The soliton breathing mode is investigated in the framework of linear
response theory within a Skyrme model vector meson stabilized. The effective
Lagrangian considered includes the (introduced following the standard
prescription of nonlinear chiral symmetry) and the mesons. The
monopole response function is found to have a pronounced peak which is
identified to the (Roper) resonance. The results are compared to those
obtained within the local approximation.Comment: 8 pages of plain Latex and 2 figures (available from the author),
preprint LPN 93-12 and IPNO/TH 93-4
Neutrino-photon reactions for energies above
We show that neutrino-photon reactions above are dominated by the
reaction . We calculate its cross-section and see
that it is larger by several orders of magnitude than the cross-sections of
other neutrino-photon processes, for energies above . We also discuss
potential astrophysical and cosmological consequences.Comment: 7 pages, 2 figure
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Security of supply and retail competition in the European gas market: Some model-based insights
In this paper, we analyze the impact of uncertain disruptions in gas supply upon gas retailer contracting behavior and consequent price and welfare implications in a gas market characterized by long-term gas contracts using a static Cournot model. In order to most realistically describe the economical situation, our representation divides the market into two stages: the upstream market that links, by means of long-term contracts, producers in exporting countries (Russia, Algeria, etc.) to local retailers who bring gas to the consuming countries to satisfy local demands in the downstream market. Disruption costs are modeled using short-run demand functions. First we mathematically develop a general model and write the associated KKT conditions, then we propose some case studies, under iso-elasticity assumptions, for the long- short-run inverse-demand curves in order to predict qualitatively and quantitatively the impacts of supply disruptions on Western European gas trade. In the second part, we study in detail the German gas market of the 1980s to explain the supply choices of the German retailer, and we derive interesting conclusions and insights concerning the amounts and prices of natural gas brought to the market. The last part of the paper is dedicated to a study of the Bulgarian gas market, which is greatly dependent on the Russian gas supplies and hence very sensitive to interruption risks. Some interesting conclusions are derived concerning the necessity to economically regulate the market, by means of gas amounts control, if the disruption probability is high enough
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