Three-body hadronic decays of B and D mesons are a superb laboratory for studying Charge-Parity (CP) violation and hadronic Final states Interactions. The gigantic samples of B and D decays collected by the LHCb (and more to come from others) experiments motivated theoretical efforts in the past decade towards building models that are based on more solid grounds. In this talk I will preesent...
Recent work on the derivation of light quark-antiquark mesons couplings to baryon’s constituent quarks will be presented by starting from a quark-quark interaction mediated by one non-nonperturbative gluon exchange. Some well known methods are considered and they provide complete well known effective models with their parameters such as coupling constants, and also form factors and averaged...
I will briefly review the gap equation which in QCD is given by the Dyson-Schwinger equation (DSE) for a quark of given flavor. Whether a gap occurs, and therefore dynamical chiral symmetry breaking that leads to a constituent-quark mass two orders heavier than the current-quark mass, depends on the DSE kernel. One crucial ingredient, besides the strong coupling itself, is the quark-gluon...
The LHCb experiment explores the heavy ion and fixed target physics using some of its specific features. Particle production of particles, notably heavy flavour states, can be studied at LHC energies in the forward rapidity region, providing complementary measurements to the other LHC experiments. An overview of these results obtained on the LHCb heavy ion program will be given.
Lattice simulations show that the running coupling constants obtained through QCD vertices differ in the infrared even though their bare values are the same. For instance, at low momenta the strength of the quark-gluon coupling is about twice the ghost-gluon coupling. None of them diverge in the infrared as it is predicted by standard perturbation theory. Moreover, the ghost-gluon coupling...
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...
I will give a presentation on this hot field of research initiated
fifteen years ago with the discovery of Ds0(2317) and X(3872) and that is giving now so many discoveries. In particular, I will review recent experimental discoveries of new tetra and pentaquark states and theoretical works on them.
We discuss how the production and dissociation of hadron states are affected by reactions during the expansion of hadronic matter. We give emphasis to recent works on quarkonia and exotic states in charm sector.
Recently, we have studied several three-body systems made of heavy mesons, like $DDK$, $KD\bar D^*$, $DK\bar K$, $ND\bar D^*$ and we have predicted the formation of nucleon and $K^*$ states with hidden charm, a $D$ meson state with a mass around 2900 MeV as well as an exotic state with charm +2 and strangeness +1. The three-body $T$-matrices have been determined by solving the Faddeev...
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...
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...
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 Gribov-Zwanziger theory takes into account the effect of Gribov gauge copies and may provide an effective description of the infrared regime of QCD. The success of this approach is based on the compatibility of its predictions with the available lattice data for correlation functions, especially gluon and ghost propagators, which point towards a dynamic mass generation in the form of...
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...
Effective field theories allow us to track the violation of symmetries across energy scales. I will discuss the manifestation in nuclei of the lowest-dimension interactions beyond the Standard Model which violate lepton number, baryon number, and time reversal. Specific processes/quantities involved include neutrinoless double-beta decay, the deuteron lifetime, and electric dipole moments of...
We review the computation of the two-point (propagators) and the quark-gluon vertex using non-perturbative first principle methods. Topics concerned with quark and gluon confinement together with chiral symmetry breaking and there relation with the propagators and vertex are also addressed.
The quark-gluon dynamics manifests itself in a set of non-perturbative functions describing all possible spin-spin and spin-orbit correlations. The Transverse Momentum Dependent parton distributions (TMDs) and Generalized Parton Distributions (GPDs) carry information not only on the longitudinal but also on the transverse momentum and position of partons, providing rich and direct...
