Power Laws and Elementary Particle Decays

Pionium in the elementary particle decays

Some atomic decays of elementary particles with pionium (ππ-dimesoatom) in the final state are considered. Only for K-meson atomic decays are the corresponding branching ratios big enough to make their experimental study realistic. The O(α) order corrections to the lifetime of pionium are also calculated.

Barkhausen noise: Elementary signals, power laws, and scaling relations.

We report extensive measurements, with sufficiently large statistics, of the Barkhausen noise ~BN! in the case of the commercial VITROVAC 6025 X metal glass sample. Applying a very scrutinized numerical procedure, we have extracted over one million of the BN elementary signals from the raw experimental data, whereby we made a rather precise estimation of the relevant power law exponents. In con...

Power laws in elementary and heavy - ion collisions - A story of fluctuations and nonextensivity ? -

We review from the point of view of nonextensive statistics the ubiquitous presence in elementary and heavy-ion collisions of power-law distributions. Special emphasis is placed on the conjecture that this is just a reflection of some intrinsic fluctuations existing in the hadronic systems considered. These systems summarily described by a single parameter q playing the role of a nonextensivity...

Power-laws and Non-Power-laws in Dark Matter Halos

Simulated dark matter profiles are often modelled as a ‘NFW’ density profile rather than a single power law. Recently, attention has turned to the rather rigorous power-law behaviour exhibited by the ‘pseudo phase-space density’ of the dark matter halo, which is defined dimensionally in terms of the local density and velocity dispersion of the dark matter particles. The non-power-law behaviour ...

Elementary Particle Physic