We will describe two different strategies for the extraction

of the strong coupling, alpha_s, using data for e+e- to hadrons. In

the first one, we determine the strong coupling using finite-energy

sum rules and a new compilation of the hadronic R-ratio from available

data for e+e- ---> hadrons below the charm threshold. This

determination is done at relatively low-energies, with three...

We study the continuum limit of SU(2) Landau-gauge gluon and ghost propagators, obtained from numerical simulations performed on lattice volumes of up to 192⁴, in the scaling region.

The bulk nuclear matter produced in heavy ion collisions carries a multitude of conserved quantum numbers: electric charge, baryon number and strangeness. Therefore, the diffusion processes associated to these conserved charges cannot occur independently and must be described in terms of a set of coupled diffusion equations. This physics is implemented by replacing the traditional diffusion...

The relative contributions of explicit and dynamical chiral symmetry breaking in QCD models of the quark-gap equation are studied in dependence of frequently employed Ansätze for the dressed interaction and quark-gluon vertex. In a naive quark picture, explicit symmetry breaking contributions are defined by a constituent-quark sigma term whereas the combined effects of explicit and dynamical...

We review some results in quark matter and few nucleon systems using effective models for QCD and the nuclear force.

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial

upgrade of the B factory facility at KEK in Tsukuba, Japan. The experiment began full operation in early 2019 and aims to record a factor of 50 times

more data than its predecessor. Belle II is uniquely capable of studying the so-called "XYZ"

particles: heavy exotic hadrons consisting of more than...

Quantum Chromodynamics is the accepted theory of the strong interaction. The gauge bosons transmitting the force are gluons. However, the non-perturbative part of QCD is far from being understood on a fundamental level. Non-perturbative aspects of QCD can be especially well studied when the gauge fields play a prominent role. A typical example are glueballs, massive particles composed solely...

In recent years, it is becoming more and more attractive the possibility of exploring the dynamics inside few-body systems directly in Minkowski space. A fully quantum-field treatment of the dynamics together with the adoption of the physical space open a new path for investigating the relativistic effects on the momentum distribution as well as the approach to critical regimes.

Three-body decays of heavy-flavoured hadrons into light particles are sequential processes, dominated by intermediate resonant states that requires a full amplitude analysis to be determined. These decays are a natural source of information about two-body scattering amplitudes, as an alternative to the early scattering data. However, the determination of the two-body amplitudes requires the...

In this talk we present the recent results from LHCb experiment, related to hadronic final states from beaty and charm decays.

We present calculation of the hyperon elastic form factors

for the baryon octet for large four-momentum transfer squared,

$q^2$, in the timelike region ($q^2 > 0$).

Our calculations are based on a covariant quark model

developed in the spacelike region ($q^2 < 0$)

and on asymptotic relations between the

spacelike and the timelike regions.

Those asymptotic relations are derived based...

We discuss properties of axial-vector mesons within an effective version of Quantum Chromodynamics in the Coulomb gauge. While recent studies have put emphasis in configuration mixing with open meson-meson channels, we here concentrate on the simpler closed-channel problem and follow the $1^+$ mixing through a wide range of quark masses. We also examine their radial excitations

and discuss...

Nucleon-nucleon correlations play an important role in the structure and binding energy of nuclei and nuclear matter. The attractive intermediate-range interaction tends to bind nucleons in pairs while the repulsive core of the interaction creates short-range correlations that keep the nucleons apart. Here, the standard $^{1}S_{0}$ and the quasideuteron $^{3}S_{1}-^{3}D_{1}$ pairing fields are...

In this work we consider the possibility that strange quark matter may be manifested in the form of strange crystal planets. These planet-like objects are made up of nuggets of strange quark matter (SQM), organized in a crystalline structure. We consider the so--called strange matter hypothesis proposed by Bodmer, Witten and Terazawa, in that, strange quark matter may be the absolutely...

Parton Distribution Functions (PDFs) are the fundamental objects containing information on the flavour structure of hadrons, and on how the hadron spin and momentum are distributed among its constituents, quarks and gluons. Because they are non-perturbation quantities, we must rely on non-perturbative methods for their computation. Lattice QCD (LQCD) is the most successful method to access the...

Ultrarelativistic heavy ions are accompanied by a large flux of quasi-real Weizsäcker-Williams photons. This opens a broad range of research possibilities, as the Weizsäcker-Williams photons can be used to study photon-photon fusion reactions as well as photonuclear reactions in a wide range of energies, see for example the review [1].

Of special interest here are diffractive...

The light mesons, like pion, play special rules in try to understanting QCD, between another motivation, the pion is the Goldstone boson, and, is central to symmetry breaking and partial current conservation

(PCAC). The most general way to take informations about the hadronic substructure, i.e.; in terms of the degrees of freedom from QCD, quarks and gluons, are the study of the...

We use the Monte Carlo particle physics code FLUKA to calculate gamma-ray spectra expected from solar flare energetic ion distributions. The FLUKA code includes robust physics-based models for electromagnetic, hadronic and nuclear interactions, sufficiently detailed for it to be a useful tool for calculating nuclear de-excitation, positron annihilation and neutron capture line fluxes and...