Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Piotrowska, Milena"'
Autor:
Piotrowska, Milena, Giacosa, Francesco
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-positron dressing together with the Weinberg compositeness condition for
Externí odkaz:
http://arxiv.org/abs/2407.20834
Autor:
Piotrowska, Milena, Giacosa, Francesco
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. Under certain conditions, the decaying state can be seen as a bound s
Externí odkaz:
http://arxiv.org/abs/2311.06975
Glueballs remain an experimentally undiscovered expectation of QCD. Lattice QCD (As well as other theoretical approaches) predicts a spectrum of glueballs, with the tensor ($J^{PC}=2^{++}$) glueball being the second lightest, behind the scalar glueba
Externí odkaz:
http://arxiv.org/abs/2304.05225
While the ground-state tensor ($J^{PC}=2^{++}$) mesons $a_{2}(1320)$, $K_{2}^{\ast}(1430)$, $f_{2}(1270)$, and $f_{2}^{\prime}(1525)$ are well known experimentally and form an almost ideal nonet of quark-antiquark states, their chiral partners, the g
Externí odkaz:
http://arxiv.org/abs/2203.16585
Autor:
Piotrowska, Milena
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 majority of mesons is made of `conventional' $q\bar{q}$ pairs, but now
Externí odkaz:
http://arxiv.org/abs/2105.08557
Autor:
Piotrowska, Milena
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 Lagrangians containing a unique $q\bar{q}$ seed state which is strongly co
Externí odkaz:
http://arxiv.org/abs/2004.09970
We study the spectral function of the axial-vector charmonium state $\chi_{c1}(2P)$ coupled to $DD^{\ast}$ mesons, by employing a quantum field theoretical approach: a pronounced enhancement close to the $D^{0}% D^{\ast0}$ threshold, to be identified
Externí odkaz:
http://arxiv.org/abs/1903.06926
Autor:
Piotrowska, Milena, Giacosa, Francesco
We investigate the well-known $c\bar{c}$ vector state $\psi(4040)$ in the framework of a quantum field theoretical model. In particular, we study its spectral function and search for the pole(s) in the complex plane. Quite interestingly, the spectral
Externí odkaz:
http://arxiv.org/abs/1810.12702
We study the well-known resonance $\psi(4040)$, corresponding to a $3^{3}S_{1}$ charm-anticharm vector state $\psi(3S)$, within a QFT approach, in which the decay channels into $DD$, $D^{\ast}D$, $D^{\ast}D^{\ast}$, $D_{s}D_{s}$ and $D_{s}^{\ast}D_{s
Externí odkaz:
http://arxiv.org/abs/1810.03495
Autor:
Piotrowska, Milena, Giacosa, Francesco
We study the strong and radiative decays of the radial excitation of the $\rho$ meson, with quantum numbers $n$ $^{2S+1}L_{J}=2$ $^{3}S_{1},$ $I=1$, and denoted as $\rho_{E}$, by making use of an effective model. We test different masses: $1.45$ GeV,
Externí odkaz:
http://arxiv.org/abs/1712.05617