Floriana Giannuzzi

Light scalar mesons in the soft-wall model of AdS/QCD

We study light scalar mesons in the holographic QCD soft-wall model with a background dilaton field. The masses and decay constants are compatible with experiment and QCD determinations if a{sub 0}(980) and f{sub 0}(980) are identified as the lightest scalar mesons; moreover, the states are organized in linear Regge trajectories with the same slope of vector mesons. Comparing the two-point correlation function of scalar operators derived on the anti-de Sitter side and in QCD, information about the condensates can be derived. Strong couplings of scalar states to pairs of light pseudoscalar mesons turn out to be small, at odds with experiment and QCD estimates: we discuss how this discrepancy is related to the description of chiral symmetry breaking in this model, and the possible solutions.

New meson spectroscopy with open charm and beauty

All the available experimental information on open charm and beauty mesons is used to classify the observed states in heavy quark doublets. The masses of some of the still unobserved states are predicted, in particular in the beauty sector. Adopting an effective Lagrangian approach based on the heavy quark and chiral symmetry, individual decay rates and ratios of branching fractions are computed, with results useful to assign the quantum numbers to recently observed charmed states which still need to be properly classified. Implications and predictions for the corresponding beauty mesons are provided. The experimental results are already copious, and are expected to grow up thanks to the experiments at the LHC and to the future high-luminosity flavour and

Holography, Heavy-Quark Free Energy, and the QCD Phase Diagram

p-\bar p

Holographic approach to finite temperature QCD: The case of scalar glueballs and scalar mesons

facilities.

Temperature and quark density effects on the chiral condensate: an AdS/QCD study

We use gauge/string duality to investigate the free energy of two static color sources (a heavy-quark-antiquark pair) in a Yang-Mills theory in strongly interacting matter, varying temperature and chemical potential. The dual space geometry is anti-de Sitter with a charged black hole to describe finite temperature and density in the boundary theory, and we also include a background warp factor to generate confinement. The resulting deconfinement line in the {mu}-T plane is similar to the one obtained by lattice and effective models of QCD.

In-medium hadronic spectral functions through the soft-wall holographic model of QCD

We study scalar glueballs and scalar mesons at T{ne}0 in the soft wall holographic QCD model. We find that, using the anti-de Sitter-black-hole metric for all values of the temperature, the masses of the hadronic states decrease and the widths become broader when T increases, and there are temperatures for which the states disappear from the scalar glueball and scalar meson spectral functions. However, the values of the temperatures in correspondence of which such phenomena occur are low, of the order of 40-60 MeV. A consistent holographic description of in-medium effects on hadron properties should include the Hawking-Page transition, which separates the phase with the anti-de Sitter metric at small temperatures from the phase with anti-de Sitter-black-hole metric at high temperatures.

Doubly heavy baryons in a Salpeter model with AdS/QCD inspired potential

We investigate the dependence of the chiral condensate

Anomalous AV V vertex function in the soft-wall holographic model of QCD

\langle\bar{q}q\rangle

AnomalousAV*Vvertex function in the soft-wall holographic model of QCD

on the temperature and quark density using the soft-wall holographic model of QCD, adopting geometries with black holes at finite temperature and quark chemical potential μ. We find that, for μ below a critical value, increasing the temperature the condensate decreases and vanishes at a temperature

Role of nonlocal probes of thermalization for a strongly interacting non-Abelian plasma

\tilde{T}\simeq210~\mathrm{MeV}