35 citations · 37 across the 9 of their papers we have counts for
11 papers · 1 filter
The weak decay constant of positronium
Milena Piotrowska, Francesco Giacosa
The positronium, as the lightest purely leptonic bound state, provides an ideal testing ground for a quantum field--theoretical (QFT) description of composite systems. While its el…
Two-photon decay of para-positronium within a composite approach
Milena Piotrowska, Francesco Giacosa
The decay of the para-positronium into two photons is studied in the framework of a composite Quantum Field Theoretical approach. This amounts to the evaluation of the electron-pos…
A QFT scalar toy model analogous to positronium and pion decays
Milena Piotrowska, Francesco Giacosa
In the framework of a scalar QFT, we evaluate the decay of an initial massive state into two massless particles through a triangle-shaped diagram in which virtual fields propagate.…
Study of conventional and non-conventional scalar and vector mesons
Milena Piotrowska
Enormous progress in physics enriched our knowledge about the particles which build matter. Among them there are mesons, to which this thesis is entirely devoted. The overwhelming…
Study of some (non-)conventional mesons in the framework of effective models
Milena Piotrowska
The main aim of our study is to understand the nature of some conventional and non-conventional mesonic states by applying effective QFT models. We start from the relativistic Lagr…
as virtual companion pole of the charm-anticharm state
Francesco Giacosa, Milena Piotrowska, Susana Coito
We study the spectral function of the axial-vector charmonium state coupled to mesons, by employing a quantum field theoretical approach: a pronounced enha…