Most states in QCD decay strongly to multi-hadron scattering states. In this talk I will review recent progress in determining the spectrum of hadrons using lattice QCD, where the resonant nature of the states is implemented exactly. Emphasis will be placed in low-lying resonances in the light mesonic sector. Lastly, I will discuss how we may be able to study structural information of these...
The Dyson-Schwinger/Bethe-Salpeter approach provides insight into many connected problems in QCD, proving to be especially powerful in describing processes that are dominated by chiral symmetry and its dynamical breaking. Being formulated in the continuum it avoids some of the difficulties encountered on the Lattice (e.g. chiral quarks etc) at the cost of having to introduce truncations.
I...
A striking feature of the strong interaction is its emergent 1-GeV mass-scale, as exhibited in the masses of protons and neutrons and numerous other hadronic bound states. In sharp contrast, the energy needed to hold the gluons and quarks within the Nambu-Goldstone Bosons, such as the pion and kaon, is not so readily apparent. Even if both quarks and gluons acquire mass dynamically, in all...
Nuclear dynamics at short distances among nucleons is one of the most outstanding phenomena in nuclear physics, where understanding the role of QCD in generating nuclear forces is important for uncovering the underlying physics of Short-Range Correlations (SRCs). In recent years, SRCs has been observed from light to heavy nuclei using fixed target experiments at Jefferson lab via high energy...
Recently studies of the form factors of the energy-momentum tensor attracted significant interest in theory and experiment. The recent developments are reviewed and perspectives for the EIC are discussed.
The prospective future Electron-Ion Collider (EIC) would offer a unique opportunity to understand the role of gluons in strongly interacting nuclear matter. An essential requirement of the EIC calorimeters is to provide adequate energy resolution, which translates into momentum resolution and reconstruction, over a wide kinematic range, as well as particle identification in the forward and...
The JETSCAPE collaboration recently released the first public version
of an innovative modular event generator and simulation framework with
a unified interface and a comprehensive suite of model implementations
for all stages of ultra-relativistic heavy ion collisions.
The framework's modularity and agnosticism regarding the underlying
physics assumptions make it a promising platform for...
Over the past several years, there has been growing interest, both experimental and theoretical, in the prospects of jet physics at the future Electron Ion Collider (EIC). Jets have several properties which make them attractive probes for both the electron-hadron and electron-nucleus EIC physics programs, including their ability to act as surrogates of scattered partons as well as the fact...
TOPSiDE is a concept of a general purpose detector for the Electron-Ion Collider.
It features advanced technologies, such as imaging calorimetry with ultra-fast
silicon detectors. The detector is conceived such that each particle can be identified
and measured individually, similar to the output of Monte Carlo simulations at the
hadron level.
We will review the status of the concept, its...
The EIC at the highest luminosities will have competitive sensitivity to search for new physics beyond the Standard Model via the observation of charged lepton flavor violation, specifically electron-tau lepton transitions as would result from the existence for instance of leptoquarks. We investigate the identification of tau leptons in the detector with high efficiency using tracking with the...
The production of a hard dijet with small transverse momentum imbalance in semi-inclusive DIS probes the conventional and linearly polarized Weizsäcker-Williams (WW) transverse momentum dependent (TMD) gluon distributions. The latter, in particular, gives rise to an azimuthal dependence of the dijet cross section. In this talk, I will discuss the feasibility of measurement of these TMDs...
The most common formulae for both inclusive and exclusive lepton scattering on nuclei frequently assume fixed-target or head-on collider kinematics. Using light-cone vectors defined by the incident beam four-momenta, I will present a universal basis of longitudinal and transverse four-vectors. This permits direct generation of particle four-momenta in the detector frame of a non-collinear...
In recent years it has become clear that inclusive Deep Inelastic Scattering does not allow to answer a few fundamental questions about the nuclear partonic structure, such the EMC effect. These difficulties will be overcome going beyond inclusive processes, in a new generation of experiments at high energy and high luminosity [1]. Deeply Virtual Compton Scattering (DVCS) is a very promising...
Generalized Parton Distributions (GPDs) have emerged during the 1990s as a powerful concept and tool to study nucleon structure. They provide nucleon tomography from the correlation between transverse position and longitudinal momentum of partons. The Double Deeply Virtual Compton Scattering (DDVCS) process corresponds to the scattering from the nucleon of a virtual photon that finally...
High-energy scatterings allow one to extract information about the distribution of partons inside hadrons. In particular, they constrain the hadronic matrix elements of the energy-momentum tensor which encode the mechanical properties of the system like energy, linear and angular momentum, moment of inertia, pressure forces, ... We present in this talk a selection of recent developments.
I will discuss the theoretical aspects of NLO computations for exclusive diffractive electron-ion processes at small x
Extraction of the strange quark PDF is a long standing puzzle. We use
nCTEQ nPDFs with uncertainties to examine W/Z production at the LHC
and try to study both the nuclear corrections and the flavor
differentiation. This complements the information from neutrino-DIS
data. Additionally, we look ahead to future facilities such as EIC,
LHeC, and LHC upgrades and use a new tool, PDFSense, to...
Probing the high-x partonic structure of nuclei opens a window in
investigation of several outstanding issues of nuclear dynamics such as
dynamics of the quark/hadron transition, medium modification of
partonic distributions, and ultimately mechanism of the nuclear
repulsive core.
Several inclusive and semi-inclusive deep-inelastic processes will be
discussed relevant to EIC kinematics...
With its high luminosity and wide kinematic coverage, the electron-ion collider (EIC) will be principally dedicated to unraveling vexing issues in QCD. In particular, these include a thorough tomographic mapping of the nucleon's internal structure as well as investigations of the quark-hadron transition, searches for the appearance and dynamics of gluon saturation, and studies of the nuclear...
We present a first determination of the nuclear parton distribution functions (nPDF) based on the NNPDF methodology: nNNPDF1.0.
This analysis is based on neutral-current deep-inelastic structure function data and is performed up to NNLO in QCD calculations with heavy quark mass effects.
For the first time in the NNPDF fits, the $\chi^2$ minimization is achieved using stochastic gradient...
Perturbative evolution of QCD cross sections is governed by the DGLAP evolution of parton distribution and fragmentation functions. This formalism breaks down at small Bjorken x (high energy) due to high gluon
density (gluon saturation) effects. The Color Glass Condensate (CGC)
formalism is an effective action approach to QCD at
small Bjorken x which includes gluon saturation. The...
The structure of Goldstone bosons is intimately tied to key questions in QCD, such as, the origin of hadron masses and color confinement. This talk will present recent results on the partonic structure of the pion and kaon obtained using the Dyson-Schwinger equations. Particular focus will be given to the properties of the pion and kaon as expressed by aspects of their light-front wave...
The rapidity distribution and the nuclear modification factor (RAA) were calculated through the exclusive photoproduction mechanism in the peripheral regime. Using the light-cone color dipole formalism commonly used in the UPC regime, theJ/ψ 1production was investigated considering three scenarios: (1) in the simplest scenario it was considered a photon flux with b-dependence without any...
