X iv : h ep - p h / 06 11 06 8 v 1 7 N ov 2 00 6 Study of FCNC mediated rare B s decays in a single universal extra dimension scenario

ar X iv : h ep - p h / 06 10 20 8 v 1 1 7 O ct 2 00 6 Rare B decays in a single Universal Extra Dimension scenario

Exclusive rare B → Kll, B → Kνν̄ and B → K∗γ decays are studied within the Applequist-ChengDobrescu model, an extension of the Standard Model in presence of universal extra dimensions. In the case of a single universal extra dimension compactified on a circle of radius R, we study the dependence of several observables on 1/R, and discuss whether the hadronic uncertainty due to the form factors o...

ar X iv : h ep - p h / 06 11 27 1 v 1 2 1 N ov 2 00 6 Structure of the axial - vector meson D s 1 ( 2460 )

ar X iv : h ep - p h / 06 11 27 1 v 2 2 2 N ov 2 00 6 Structure of the axial - vector meson D s 1 ( 2460 )

ar X iv : h ep - p h / 06 11 05 4 v 1 5 N ov 2 00 6 Lepton flavor violating semileptonic τ decays τ → lP ( V ) in topcolor scenario

The contributions of the neutral top-pion π t and the non-universal gauge boson Z ′ predicted by topcolor scenario to the lepton flavor violating (LFV ) semileptonic τ decays τ → lP (V ) (P = π, η, η′ and V = ρ, φ) are discussed. We find that the contributions of Z ′ to these decay processes are generally larger than those from π t . π 0 t can only make the value of the branching ratio Br(τ → l...

ar X iv : h ep - p h / 06 11 17 4 v 1 1 3 N ov 2 00 6 Freiburg - THEP 06 / 15 The Z ′ reconsidered

We consider the extension of the standard model with an arbitrary number of U (1) gauge fields coupled to baryon-minus-lepton number and/or hypercharge. Under the assumption that A b fb from the LEP1 experiment is an unlucky fluctuation, we find moderate evidence for the presence of such fields in the precision electroweak data. A relatively large range of the Higgs boson mass is allowed. We di...