High-energy electrons and photons serve as remarkably clean probes of hadronic matter, providing a microscope for examining the strong nuclear force. One of the most striking phenomena of Quantum Chromodynamics (QCD) is the formation of hadrons out of massless gluons and nearly massless quarks. This system of confined quarks and gluons exhibits the characteristic spectra of excited states,...
The study of the hadron spectrum from first-principles in QCD has been facilitated by performing a numerical calculation of the path integral of the theory. This technique, known as lattice QCD, has some inherent restrictions, e.g. it needs to be performed in a finite Euclidean spacetime. This restriction prevents a direct calculation of real-time dynamics like those associated with scattering...
The BESIII experiment in Beijing, China uses e+e- collisions with center-of-mass energies in the 2-5 GeV region to produce and study a wide range of hadron states. The hadron spectroscopy program spans the light quark, open charm, and charmonium sectors. In this talk, I'll discuss recent highlights in both light quark spectroscopy, including studies of mesons with exotic quantum numbers and...
JPAC has been using amplitude analyses as the basis for hadron spectroscopy. Our efforts have yielded a number of important results and discoveries. In this talk I describe the most recent results from the collaboration, particularly our efforts in understanding the production of conventional and exotic resonances, and the properties of these resonances.
Gravitational form factors (GFFs), defined through the matrix elements of the energy-momentum tensor, provide critical insights into the internal structure of nucleons and nuclei. In particular, their Fourier transforms in the Breit frame yield, among others, spatial distributions of mass, and scalar energy densities associated with both quark and gluon constituents.
I will present the recent...
The Charged Pion Polarizability (CPP) experiment at Jefferson Lab is a precision measurement of the pion electromagnetic polarizability using the GlueX detector. The electromagnetic polarizability is a fundamental property of particles that measures the rigidity of a system to deformation from electromagnetic forces. Cross sections for $\gamma \gamma \to \pi^+ \pi^-$ and the pion...
The deuteron, a weakly bound spin-1 nucleus, exhibits a tensor-polarized structure that provides unique access to quark and gluon distributions within light nuclear systems, distributions that cannot be simply inferred from the individual proton and neutron.
Experimental data on this tensor system remain limited, and measurements that could fully reveal the 3D structure of the deuteron are...
Today, physicists build massive detectors to capture the faintest recoils of nuclei colliding with neutrinos and dark matter (DM). These experiments aim to enable high-precision tests of the Standard Model and to searches for physics Beyond the Standard Model. To meaningfully interpret such searches, accurate theoretical predictions of neutrino-nucleus and DM-nucleus cross sections are needed....
