In the recent years, it has been realized that beyond the successful perturbative and collinear description of hard scatterings, a variety of polarization-dependent observables exists sensitive to the elusive quark-gluon interactions.
New parton distributions and fragmentation functions have been introduced that, besides the hard probe scale, explicitly depend on the parton transverse...
We study deviations from the Standard Model in the Lambda_c to Lambda_s semileptonic decay, where lepton flavour universality violation could be observed. We consider generalised dimension-6 semileptonic c to s operators of scalar, pseudoscalar, vector, axial-vector and tensor types. We rely on lattice QCD for the hadronic transition form factors, employing heavy quark spin symmetry (HQSS) to...
Understanding single pion production reactions on free nucleons is the first step towards a correct description of these processes in nuclei, which are important for signal and background contributions in current and near future accelerator neutrino oscillation experiments. We reanalyze our previous studies of neutrino-induced one-pion production on nucleons for outgoing $\pi N$ invariant...
In the context of lepton flavor universality violation (LFUV) studies, we study different observables related to the $b\to c\tau \bar{\nu}_\tau$ semileptonic decays. These observables are expected to help in distinguishing between different NP scenarios. Since the $\tau$ lepton is very short-lived, we consider three subsequent $\tau$-decay modes, two hadronic $\pi\nu_\tau$ and $\rho\nu_\tau$...
I'll review the recent works by the Joint Physics Analysis Center (JPAC) concerning the experimental extraction of properties of exotic hadron candidates.
Since 2003 many new hadrons, including the lowest-lying positive-parity charm-strange mesons D∗s0(2317) and Ds1(2460), have been observed that do not conform with quark-model expectations. We discuss how various puzzles in the charm-meson spectrum find a natural resolution if the SU(3) multiplets for the lightest scalar and axial-vector states, among them the D∗s0(2317) and the Ds1(2460), owe...
The nonrelativistic quark models predict the existence of one light hybrid nonet in the mass range $1.7-2.2$ GeV. As a validation of this prediction, the PDG lists an isovector state dubbed $\pi_1(1600)$ with quantum numbers $1^{-+}$. However, the observation of two such isovector with closely lying masses - $\pi_1(1400)$ and $\pi_1(1600)$ raised curiosity in the community, in part because of...
Measurements of correlations between particle pairs with low relative momentum via femtoscopy in pp collisions have been recently demonstrated to be very sensitive to the effects of the final-state strong interaction. Such studies face now a new challenge with the extension for the first time to three-body systems. The presented results are obtained using high-multiplicity pp collisions at...
Dispersive and analytic methods have contributed to settle the longstanding debate on the existence and parameters of light scalar mesons.I will review the present situation and describe the latest developmentsin the strange sector, particularly the controversial K0(700) or kappa, as well as the f0(1370).
The axial form factor is a fundamental property of the nucleon and a key ingredient of neutrino-nucleon cross sections. We have calculated this form factor in relativistic Chiral Perturbation Theory at next to leading one-loop order. We investigate the problem of convergence of the perturbative series and fit to recent LQCD results. The explicit Delta(1232) is crucial to reconcile the...
A key step toward a better understanding of the nucleon structure is the study of Generalized Parton Distributions (GPDs). GPDs are nowadays the object of an intense effort of research since they convey an image of the nucleon structure where the longitudinal momentum and the transverse spatial position of the partons inside the nucleon are correlated. Moreover, GPDs give access, via Ji's sum...
The modification of the bound nucleons’ parton structure induced by the nuclear medium, known as EMC effect, is still nowadays a hot topic. Exclusive scattering processes as deeply virtual Compton scattering (DVCS) are able to provide hints about the three-dimensional partonic structure of any hadronic system from a new point of view. Going beyond the collinear information coming from deep...
J/ψ near threshold photoproduction plays a key role in the physics program at the Thomas Jefferson National Accelerator Facility (JLab) 12 GeV upgrade due to the wealth of information it has to offer. J/ψ photoproduction proceeds through the exchange of gluons in the t-channel and is expected to provide unique insight about the nucleon gluonic form factor and the nucleon mass radius.
The...
The study of the quantum chromodynamics (QCD) is the main motivation for the exotic hadronic atom experiments. Among the exotic atom, the kaonic atom spectroscopy plays a key role for the understanding of the low-energy QCD in the strangeness sector, by allowing to directly access the antikaon-nucleus ($\bar{\text{K}}$N) interaction at threshold. Currently, the lack of experimental inputs...
The recent progress in the field of X-ray detection and their readout electronics contributed, in these last years, to a renewed interest in new and more precise measurements of kaonic atoms.
The DAFNE machine at the INFN Laboratories of Frascati is still the best facility in the world, in terms of purity of the kaon beam, luminosity, and kinematic conditions, where these important...
The spectroscopy of charmonium-like states together with the spectroscopy of charmed and strange baryons is discussed. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models [1, 2, 3]. An understanding of the baryon spectrum is one of the primary goals of...
The spectroscopy of higher lying charmonium states together with exotic mesons with masses above the 2mD open charm threshold has been full of surprises and remains poorly understood [1]. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models. The experiments...
