1 citations · 1 across the 10 of their papers we have counts for
12 papers
The Sill distribution for all partial waves
Krzysztof Kyzioł, Francesco Giacosa
In high-energy physics, short-lived resonances appearing in scattering processes are described by energy-dependent spectral functions. The relativistic Breit--Wigner distribution (…
Late-Time Power Laws in Fluorescence Decays: Quantum Decay or Alternative Mechanisms?
Francesco Giacosa, Anna Kolbus, Krzysztof Kyziol +4
In quantum mechanics, the properties of an unstable system are closely related to its corresponding energy distribution. One of the predictions of the theory is the emergence of a…
On the failure of the rule in and decays
Arthur Vereijken, Francesco Giacosa
The rule relates hadronic decays of the and through the ratio of their wave functions at the origin, but is strongly violated in several vector--pseudoscalar (…
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-exponential decay of Acridine Orange
Francesco Giacosa, Anna Kolbus, Krzysztof Kyziol +4
In this work, we experimentally study the fluorescence decay of Acridine Orange at late times, in order to test whether a late-time power-law behaviour emerges, a feature expected…
Quantum Late-Time Decay and Channel Dependence
Francesco Giacosa, Anna Kolbus, Krzysztof Kyziol +4
Quantum mechanics predicts deviations from exponential decay at short and long times, yet experimental evidence is limited. We report a power-law tail after 10 lifetimes in t…
Nonexponential decay law of the 2P-1S transition of the H-atom
Francesco Giacosa, Krzysztof Kyzioł
We evaluate numerically the survival probability for the unstable 2P excited state of the hydrogen atom, which decays into the ground-state 1S emitting one photon ($τ\sim 1.…
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…
Introductory visual lecture on QCD at large-: bound states, chiral models, and phase diagram
Francesco Giacosa
In these lectures, we present the behavior of conventional mesons, glueballs, and hybrids in the large- limit of QCD. To this end, we use an approach based on rat…
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.…
A study of the excited radial vector meson
Milena Piotrowska, Francesco Giacosa
We study the strong and radiative decays of the radial excitation of the meson, with quantum numbers , and denoted as , by making…
Strong decays of excited vector mesons
M. Piotrowska, F. Giacosa
We study two nonets of excited vector mesons, predominantly corresponding to radially excited vector mesons with quantum numbers and to or…