117951493
Theoretical perspective on the NA62 physics program
Soon the NA62 experiment will start looking for the rare K+ ---> pi+ nu nu bar decay. In this talk, its theoretical interests, together with those of the neutral rare decays KL ---> pi0 nu nu bar, KL ---> pi0 e+ e-, and KL ---> pi0 mu+ mu-, are briefly reviewed. Then, other possible targets for NA62 are discussed, among which the dominant semileptonic decays, the radiative decays, as well as the lepton-flavor violating decays.
14402674
Supersymmetric models with minimal flavor violation and their running
We revisit the formulation of the principle of minimal flavor violation (MFV) in the minimal supersymmetric extension of the standard model, both at moderate and large tan β, and with or without new CP-violating phases. We introduce a counting rule which keeps track of the highly hierarchical structure of the Yukawa matrices. In this manner, we are able to control systematically which terms can be discarded in the soft SUSY breaking part of the Lagrangian. We argue that for the implementation of this counting rule, it is convenient to introduce a new basis of matrices in which both the squark (and slepton) mass terms as well as the trilinear couplings can be expanded. We derive the RGE for the MFV parameters and show that the beta functions also respect the counting rule. For moderate tan β, we provide explicit analytic solutions of these RGE and illustrate their behavior by analyzing the neighborhood (also switching on new phases) of the SPS-1a benchmark point. We then show that even in the case of large tan β, the RGE remain valid and that the analytic solutions obtained for moderate tan β still allow us to understand the most important features of the running of the parameters, as illustrated with the help of the SPS-4 benchmark point.
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
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
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.
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.
125682886
Calibration of the MINOS detectors and extraction of neutrino oscillation parameters
117965455
Search for gluino pair production using like-sign top dilepton events
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.