ResearchThe group has broad research interests across nuclear physics, with a particular speciality being applications of lattice QCD to contemporary problems.
Dudek's research interests lie principally in understanding the
spectrum of excited hadrons within QCD. While the traditional
picture of hadrons has mesons as $q\bar{q}$ bound-states and baryons
as $qqq$, QCD in principle allows for a much richer spectrum, which
might include states constructed from larger numbers of quarks, or
hadrons featuring only glue (glueballs) or quarks and glue
(hybrids).
Monahan's work uses lattice QCD to study the internal structure
of hadrons, their weak interactions and in searches for new physics at
the precision frontier. One strand of his research focuses on how
quarks and gluons are arranged inside protons and neutrons,
information that can be used at the LHC to reduce background
uncertainties in searches for new particles. Orginos's research focuses on understanding the physics of hadrons, whose dynamics is governed by the strong interactions. Quantum Chromodynamics (QCD), the theory of strong interactions, has a remarkably rich phenomenology. Because the interaction becomes strong at low energies, Lattice QCD is the only known way to compute rigorously the properties and interactions of hadrons directly from QCD. In recent years, substantial progress has been made in the field, providing us with the opportunity to compute many observables of central importance in subatomic physics. Using Lattice QCD Orginos is currently studying low energy hadronic phenomenology, including the structure and interactions of hadrons, weak interactions, and fundamental symmetries. In addition, he works on developing new computational techniques that make possible the study of phenomena currently inaccessible to available computational resources. Orginos's current research interests include hadron interactions, hadron structure, algorithms for lattice field theory and other topics in computational physics.
Emeritus Professor Carlson works on a variety of topics, mainly on the theme on using precision nuclear or particle physics to find discrepancies from standard-model physics, with a significant subinterest in optics and atomic physics, currently targeted on phenomena related to twisted photon states. Nuclear physics topics include two-photon physics to explain discrepancies between different ways of measuring the proton charge form factor, early-on-neglected corrections to the proton weak charge measurement that turned out to be larger than the anticipated experimental uncertainty, and corrections relevant to and possible beyond the standard model explanations of the proton radius puzzle. Regarding twisted photons, they are photon states of large intrinsic angular momentum, which can on atomic or nuclear targets induce quantum number changes impossible for plane wave photons. Far future applications include using energetic twisted photons to isolate high spin baryon or nuclear excited states. Currently we are successfully testing ideas by studying twisted photon phenomena in an atomic context.
The determination of the three-dimensional structure of hadrons in
terms of the fundamental quark and gluon (or parton) degrees of
freedom of QCD is one of the outstanding challenges of the Standard
Model and a central mission of the Jefferson Lab science program. The
Jefferson Lab Theory Center plays a leading role in the development of
new formalisms and techniques to quantify this structure through
various quantum correlation functions, such as parton distribution
functions (PDFs), fragmentation functions (FFs), transverse momentum
dependent distributions (TMDs), generalized parton distributions
(GPDs), and multi-parton correlation functions. Opportunities for
Ph.D. research in these areas are available at Jefferson Lab through
Governor’s Distinguished CEBAF Professor Qiu and Adjunct Professors Melnitchouk and Richards. |