Results 1 - 10 of 19454
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[en] The main purpose is to discuss recent developments in the study of production and decay properties of open new flavors such as charmed mesons and baryons and comparison with predictions of the only available strong interaction theory: quantum chromodynamics
[en] Three models of weak interactions based on six different flavors of quarks are considered. In all cases, for each given flavor there will be three colored quarks, weak and electro-magnetic interactions being color invariant. Furthermore the gauge group of the weak and electromagnetic interactions is restricted to be the familiar, minimal SU(2)XU(1) group. The most interesting theoretical aspects and experimental implications of this six flavors are envisaged for the simplest (purely lefthanded) model, a model with righthanded currents, and a vectorlike model involving a weak interaction theory which is basically parity conserving
[en] We consider a class of discrete flavor symmetries for leptons based on the group S3 and A4 with a hybrid breaking pattern. The aim is to construct models in which the same flavon fields producing the mixing pattern are also responsible for the mass hierarchy.
[en] We consider a series of massive scaling limits m1→∞, q→0, limm1q=Λ3 followed by m4→∞, Λ3→0, limm4Λ3=(Λ2)2 of the β-deformed matrix model of Selberg type (Nc=2, Nf=4) which reduce the number of flavors to Nf=3 and subsequently to Nf=2. This keeps the other parameters of the model finite, which include n=NL and N=n+NR, namely, the size of the matrix and the ''filling fraction.'' Exploiting the method developed before, we generate instanton expansion with finite gs, ε1,2 to check the Nekrasov coefficients (Nf=3, 2 cases) to the lowest order. The limiting expressions provide integral representation of irregular conformal blocks which contains a 2d operator lim(1/C(q)):e(1/2)α1φ(0):(∫0qdz:ebEφ(z):)n:e(1/2)α2φ(q): and is subsequently analytically continued.
[en] We present a concise review of the recent important experimental developments on neutrino mixing (hints for sterile neutrinos, large θ13, possible non maximal θ23, approaching sensitivity on δCP) and their implications on models of neutrino mixing. The new data disfavour many models but the surviving ones still span a wide range going from Anarchy (no structure, no symmetry in the lepton sector) to a maximum of symmetry, as for the models based on discrete non-abelian flavour groups