Δεμερτζής Ν., Σταυρακάκης Γ., Ντάβου Μπ., Αρμενάκης Α., Χρηστάκης Ν., Γεωργαράκης Ν., Μπουμπάρης Ν., 2008, Νεολαία - Ο αστάθμητος παράγοντας;, Αθήνα, Εκδόσεις Πολύτροπον

neutrino asymmetry generation from ν α ↔ ν s oscillations

Active–sterile neutrino oscillations provide a mechanism by which large differences in the neutrino and antineutrino number densities can be created in the early universe. The quantum kinetic equations are employed in the study of these neutrino asymmetries, which, when solved analytically in the adiabatic limit, generate physically transparent evolution equations that are very useful for the u...

Large ν μ → ν τ and ν e → ν τ transitions in short - baseline experiments ?

Considering four-neutrino schemes of type 3+1, we identify four small regions of the neutrino mixing parameter space compatible with all data. Assuming a small mixing between the sterile neutrino and the isolated mass eigenstate we show that large νμ → ντ and νe → ντ transitions are predicted in short-baseline experiments and could be observed in the near future in dedicated experiments. We dis...

Maximal ν μ − ν τ Mixing

The naturalness of maximal mixing between myon-and tau-neutri-nos is investigated. A spontaneously broken nonabelian generation symmetry can explain a small parameter which governs the deviation from maximal mixing. In many cases all three neutrino masses are almost degenerate. Maximal ν µ − ν τ-mixing would indicate that the leading contribution to the light neutrino masses arises from the exp...

Infrared diode laser spectroscopy of the CCO radical : The 2 ν 1 − ν 1 and ν 1 + ν 3 − ν 3 difference bands

K + → π + ν¯ν Beyond Leading Logs and Vtd ∗

The calculation of QCD corrections beyond the leading logarithmic approximation for the short-distance dominated rare decay K → πνν̄ is summarized. This analysis requires the complete O(αs) corrections to the top contribution to all orders in the top-quark mass and a two-loop renormalization group (RG) calculation for the charm contribution. The inclusion of these QCD corrections reduces conside...