Our understanding of the physics of baryonic systems containing strangeness is limited by the scarcity of experimental data. Aiming at alleviating this deficit is Lattice QCD (LQCD), a numerical approach to solve the complex dynamics of strongly interacting systems of hadrons and nuclei. I will present the results obtained by the NPLQCD collaboration for two octet-baryon systems, with...
We study the two body decay of mesons using the covariant helicity formalism. We find that to explain the ratio of partial wave amplitudes of the decay processes, the Lagrangian must include operators with dimension>4. We estimate the coupling constants in the cases of 1++→1−−0−, 1+−→1−−0−, 2−+→2++0−, and 2−+→1−−0− decays by fitting the ratio of the derived partial wave amplitudes and the...
The main goal for modern nuclear physics is to build a fundamental understanding of the nuclear structure and dynamics from fundamental principles of the strong nuclear force (QCD). A plethora of experimental data exist on light and heavier nuclei utilizing experiments at Thomas Jefferson laboratory (JLAB) and the CEBAF Large Acceptance Spectrometer that can be used to study nuclear reactions...
For a general Hb→Hcτν− decay we analyze the role of the τ polarization vector in the context of LFU violation studies. We use a general phenomenological that includes several new physics terms. We show that both in the laboratory frame and in the center of mass, a P component is only possible for complex Wilson coefficients. We make specific evaluations of the polarization vector components...
Matter at high densities is still a relatively unsolved mystery and significant work is being conducted in an attempt to gain some knowledge about it and the role played by the nuclear forces and QCD. This research is employing the use of the A2@MAMI facility to investigate the 6 quark configuration, aka. dibaryons, in a state of high density within the nucleus of Ca-40 and Ca-48. The poster...
The scalar glueball G is the lightest particle of the
Yang-Mills sector of QCD, with a lattice predicted mass of about
mG≃1.7 GeV. It is natural to investigate glueball-glueball
scattering and studying the possible emergence of a bound state,
that we call glueballonium. We perform this study in the context of a
widely used dilaton potential, that depends on a single parameter ΛG. We...
Experimental data for pion photoproduction including
differential cross sections and various polarization observables
from four reaction channels, γp→π0p, γp→π+n, γn→π−p and γn→π0n from
threshold up to W=2.2~GeV have been used in order to perform a
single-energy partial wave analysis with minimal model dependence by
imposing constraints from unitarity and fixed-t analyticity in...
We study the strong and radiative decays of the antiquark-quark ground state nonet{ρ3(1690),K⋆3(1780),ϕ3(1850),ω3(1670)} in the framework of an effective quantum field theory approach, based on the SUV(3) flavor symmetry. The effective model is fitted
to experimental data listed by the Particle Data Group . We predict numerous experimentally
unknown decay widths and branching ratios. An...
MesonEx experiment at CLAS12 studies exotic mesons production. Investigating exclusive π0 production is crucial to understand the viability of the fundamental ηπ reaction. These studies aim to the beam asymmetry Σ calculation and the comparison of the latter with the same obtained by GlueX and SLAC experiments.(Phys. Rev.C, 95:042201, Apr 2017) As the outcomes of these experiments shows...
In recent years, hadron spectroscopy has led to the discovery of some exotic states found in the hidden-charm and hidden-bottom sectors, like the Zc(3900), Zc(4020), Zb(10610) and Zb(10650). These states do not fit the conventional constituent-quark models given that they are expected to contain hidden-charm or hidden-bottom components respectively, but they are also found to be charged. The...
