ar X iv : h ep - p h / 02 09 37 3 v 1 3 0 Se p 20 02 The Hidden Sterile Neutrino and the ( 2 + 2 ) Sum Rule

ar X iv : h ep - p h / 02 09 37 3 v 3 2 3 A pr 2 00 3 The Hidden Sterile Neutrino and the ( 2 + 2 ) Sum Rule

We discuss oscillations of atmospheric and solar neutrinos into sterile neutrinos in the 2+2 scheme. A zero order sum rule requires equal probabilities for oscillation into νs and ντ in the solar+atmospheric data sample. Data does not favor this claim. Here we use scatter plots to assess corrections of the zero order sum rule when (i) the 4× 4 neutrino mixing matrix assumes its full range of al...

ar X iv : h ep - p h / 02 09 37 3 v 2 2 5 N ov 2 00 2 The Hidden Sterile Neutrino and the ( 2 + 2 ) Sum Rule

We discuss oscillations of atmospheric and solar neutrinos into sterile neutrinos in the 2+2 scheme. A zero order sum rule requires equal probabilities for oscillation into νs and ντ in the solar+atmospheric data sample. Data does not favor this claim. Here we use scatter plots to assess corrections of the zero order sum rule when (i) the 4× 4 neutrino mixing matrix assumes its full range of al...

ar X iv : h ep - p h / 02 09 33 2 v 1 2 7 Se p 20 02 1 K → ππ Electroweak Penguins in the Chiral Limit

We report on dispersive and finite energy sum rule analyses of the electroweak penguin matrix elements (ππ)2|Q7,8|K 0 in the chiral limit. We accomplish the correct perturbative matching (scale and scheme dependence) at NLO in αs, and we describe two different strategies for numerical evaluation.

ar X iv : h ep - p h / 02 09 12 7 v 1 1 2 Se p 20 02 Neutrino factories — Physics potential and present status

The observation of atmospheric neutrinos (See, e.g., Ref.[1]) and solar neutrinos (See, e.g., Ref.[2, 3]) gives the information on the mass squared differences and the mixings, which can be written in the three flavor framework of neutrino oscillations as (|∆m32|, θ23) and (∆m21, θ12), where I have adopted the standard parametrization [4] for the 3× 3 MNSP [5, 6] matrix. On the other hand, the ...

ar X iv : h ep - e x / 02 09 04 3 v 1 1 8 Se p 20 02 1 Elementary Hadronic Interactions at the CERN SPS