119426322
Theory review on rare K decays: Standard model and beyond
The theoretical status of the rare K → π ν ν ¯ , K L → π 0 l + l − and K L → μ + μ − decays in the Standard Model is reviewed. Their sensitivity to New Physics and their discriminating power is also illustrated.
118649028
Tree-level contributions to the rare decays B+ ---> pi+ nu anti-nu, B+ ---> K+ nu anti-nu, and B+ ---> K*+ nu anti-nu in the Standard Model
The tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu are analyzed and compared to those occurring in K+ --> pi+ nu anti-nu, D+ --> pi+ nu anti-nu, and Ds+ --> pi+ nu anti-nu. It is shown that these purely long-distance contributions, arising from the exchange of a charged lepton, can be significant in B+ decays for an intermediate tau, potentially blurring the distinction between the modes used to extract B --> tau nu and those used to probe the genuine short-distance b --> (s,d) nu anti-nu FCNC transitions. Numerically, the tree-level contributions are found to account for 97%, 12% and 14% of the total B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu rates, respectively.
17438804
What could be learnt from positronium for quarkonium
In order to fulfill Low's theorem requirements, a new lowest order basis for bound state decay computations is proposed, in which the binding energy is treated non-perturbatively. The properties of the method are sketched by reviewing standard positronium decay processes. Then, it is shown how applying the method to quarkonia sheds new light on some longstanding puzzles. Comment: 12 pages, 10 figures. Talk given at the ETH Workshop on Positronium Physics, May 30-31, 2003, Zurich, Switzerland
809980
Long-distance effects in rare K decays
Rare K decays provide for very clean tests of the Standard Model, and are especially suited to search for New Physics signal. In this talk, recent progresses in the estimation of long-distance effects induced by light quarks in KL to pi0 mu+ mu- and K+ to pi+ nu nu are reported.
119335059
Radiative kaon decays and the penguin contribution to the Delta I = 1/2 rule
A consistent census of penguins in the Delta I = 1/2 rule is taken from the eta0 pole contribution to the radiative KL to gamma gamma, KS to pi0 gamma gamma and K+ to pi+ gamma gamma decay modes. We briefly comment on its impact for KL to pi0 pi0 gamma gamma, KL to pi+ pi- gamma and check its compatibility with the KL - KS mass difference and the CP violating epsilon-prime / epsilon parameter. Comment: 37 pages, 16 figures
117809651
Rare K decays in the standard model
The very clean theoretical predictions for the rare decays K --> pi nu nu_bar and KL --> pi0 l+ l- are reviewed, and their various theoretical inputs summarized. The less favorable situation for KL --> mu+ mu- is also commented.
122680292
Higgs results from the ATLAS experiment (Standard Model and Beyond)
The discovery of a new particle consistent with the Standard Model-like Higgs boson, with a mass of about 125 GeV, was announced by the ATLAS and CMS experiments on the 4th July, 2012. After the discovery, the properties of this new particle have been studied with high precision measurements of its mass, spin and couplings in all the accessible decay channels. In this paper, recent results from the ATLAS experiment are presented, including: H -> gamma gamma, H -> ZZ(*) -> 4l, H -> WW(*) -> l nu l nu, H -> tau tau, H -> Z gamma, H -> mu mu VH -> b (b) over bar, VH -> WW(*), ttH -> gamma gamma channels. Furthermore, searches for beyond the standard model Higgs bosons are briefly reviewed.
125682886
Calibration of the MINOS detectors and extraction of neutrino oscillation parameters