DAFS study of intermediate-range order in ν-GeO2and ν-GeSe2

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...

Study of γγ Background in e + e − → W + W − ν¯ν → H 0 ν¯ν Events at the Tesla e + e − Linear Collider

The effect of the overlap of γγ → hadrons to Hνν̄ events has been studied for the case of the Tesla e+e− linear collider at √ s = 350 GeV. It was found that, due to the significant bunch length and the track extrapolation accuracy provided by the Vertex Tracker, the γγ background to physics events can be substantially reduced, with moderate loss in reconstruction efficiency, by a combination of ...

Short-range order of compressed amorphous GeSe2

The structure of amorphous GeSe2 (a-GeSe2) has been studied by means of a combination of two-edges X-ray absorption spectroscopy (XAS) and angle-dispersive X-ray diffraction under pressures up to about 30 GPa. Multiple-edge XAS data-analysis of a-GeSe2 at ambient conditions allowed us to reconstruct and compare the first-neighbor distribution function with previous results obtained by neutron d...

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