Conveners
Hadron Structure, Spectroscopy and Dynamics: 1
- Silvia Niccolai (IPN Orsay)
Hadron Structure, Spectroscopy and Dynamics: 2
- There are no conveners in this block
Hadron Structure, Spectroscopy and Dynamics: 3
- There are no conveners in this block
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...
Using e+e- annihilation in the tau-charm energy region, the BESIII experiment plays a key role in the spectroscopy of both hadrons made from the light up, down and strange quarks and of charmonium(-like) states.
World-record datasets on the J/psi and psi(2S) states allow for highly precise studies of glueball and hybrid meson candidates, whereas dedicated data above the open-charm threshold...
An important part of the physics programme of the COMPASS experiment at CERN consists in the measurement of transverse spin and transverse momentum effects in Semi-Inclusive Deep Inelastic Scattering (SIDIS) of high energy muons off unpolarised and transversely polarised nucleons.
In this talk, the most relevant new results on SIDIS off unpolarised protons and transversely polarised deuterons...
Studying hadronization - the process by which quarks and gluons transition into hadrons -is fundamental to understanding the strong interaction dynamics within quantum chromodynamics (QCD). Using the CLAS12 detector at Jefferson Lab, the Run Group E (RGE) experiment offers unprecedented insights into hadronization in the nuclear medium. This talk will present preliminary results from the...
The FAMU collaboration aims to measure the hyperfine splitting (hfs) of the muonic hydrogen in the ground state, contributing to the understanding of the proton magnetic structure. The Zemach radius of the proton can be estimated from the hfs measurement with an accuracy better than 1%.
The experiment is conducted at the ISIS facility of the Rutherford Appleton Laboratory (UK) at the RIKEN...
Understanding the internal structure of nucleons remains one of the important challenges in hadronic physics. The measurement of Deeply Virtual Compton Scattering (DVCS) from the neutron provides unique information on Generalized Parton Distributions (GPDs), offering a three-dimensional picture of the neutron’s partonic structure. This talk will detail the extraction of the neutron DVCS...
The Axial-Vector Form Factor (AVFF) is so far largely unknown compared to the other form factors of the nucleon. Only its normalisation at $Q^2=0$ is experimentally well known from $\beta$ decay.
Most AVFF experimental knowledge at $Q^2>0$ is owing to $\nu$ quasi-elastic scattering on nuclei, and is therefore strongly affected by the determination of $\nu$ beam energy; low statistics; also...
While the existence of hadrons such as baryons and mesons is well-established, it is clear that the vast majority of their mass originates not from the constituent quarks themselves, but emerges from the properties of the strong force of nature that binds them. Exploring hadron structure and spectroscopy offers a unique window into Quantum Chromodynamics (QCD, the theory governing the strong...
SpinQuest, a fixed-target experiment at Fermilab, studies the Drell-Yan process by utilizing transversely polarized NH₃ and ND₃ targets alongside an unpolarized 120-GeV proton beam. The primary goal is to measure single spin azimuthal asymmetries that arise from the correlation between the transverse momentum of the struck quark and the spin of the parent nucleon, referred to as Sivers...
In the non-perturbative regime of Quantum Chromodynamics, the quark and gluon dynamics in a nuclear medium can be studied through the hadronization process. The deep inelastic electron scattering experiments are a clean way to liberate a bound quark from a nucleon in the medium and study the hadronization process. The E02-104 experiment at the Thomas Jefferson National Accelerator Facility...
The detection of antimatter is primarily based on its annihilation, thus the understanding of the antiproton-nucleus ($\bar{\mathrm{p}}\mathrm{A}$) interaction is crucial. Despite its significance, current models - compared mainly to experimental results from LEAR - show deviations from low-energy measurements by large factors, suggesting that the annihilation mechanism is not yet fully...
The HADES (High-Acceptance Di-Electron Spectrometer) detector is a versatile device operating at SIS18 synchrotron at GSI Darmstadt with a vital list of results in the elementary and heavy ion collisions. It combines unique capability of dileptons and hadrons identification. HADES provides a unique platform for investigating elementary reactions, with a particular focus on the strangeness and...
As unexpected as it may seem, the past few years revealed that it is possible to ascribe a well-defined meaning to the notion of proton internal pressure, to identify several associated observables that can be measured in contemporary experiments and from them to extract this internal pressure in a theoretically controlled manner. The conceptual breakthrough originates from the definition of...
The study of the Generalized Parton Distributions (GPDs) is a focal point of hadron physics since they provide rich information about the inner structure of nucleons. Experimentally, measurements of the Compton Form Factors (CFFs) via the Deeply Virtual Compton Scattering (DVCS) process is the simplest approach to access GPDs.
The DVCS experiment in Hall C at the Jefferson Lab was conducted...
The electromagnetic structure of baryons, parametrized in terms of electromagnetic form factors (EMFFs), provides a key to understanding quantum chromodynamics effects in bound states. While spacelike form factors for the proton and neutron are accessible through the elastic electron scattering, the most viable option for unstable hadrons is the timelike EMFFs. Recently, precise measurements...
The status of several CLAS12 semi-inclusive deep inelastic scattering measurements sensitive to TMDs, including several new results from a 10.5 GeV longitudinally polarized electron beam incident on a longitudinally polarized target, will be discussed. These measurements will be placed into context of the global study of TMDs with a particular focus on areas where CLAS12 and other fixed target...
An experimental program has been approved at the Thomas Jefferson National Accelerator Facility to measure the (ep,e’K+)Y reactions to study the spectrum and structure of excited nucleon states. New data from CLAS12 on πN, ππN, and KY electroproduction have been obtained using electron beams with energies of 6.5 and 7.5 impinging upon a liquid hydrogen target. Scattered electrons have been...
Quantum Chromodynamics (QCD) is the theoretical framework to study hadrons by means of their fundamental degrees of freedom, i.e. quarks and gluons, collectively referred to as partons. QCD defines many types of distributions describing a given hadron in terms of partons. For the purposes of this talk, we are interested in the so-called generalized parton distributions (GPDs) which are...
Generalized Parton Distributions (GPDs) are probability functions describing spatial and momentum distributions of partons in nucleon structure studies. They are crucial for understanding the correlation between the longitudinal momentum and the transverse position of partons inside the nucleon. The Deeply Virtual Compton Scattering (DVCS) is a privileged channel for GPD studies, as...
The four-body Schrödinger equations in momentum representation are solved to investigate the bound-state solutions for a system consisting of a phi-meson (ϕ) and three nucleons (NNN). The analysis uses a new spin-3/2 N−ϕ potential derived from lattice QCD simulations near the physical point and the realistic NN Malfliet-Tjon (MT) potential. Our numerical calculations for the ϕppn system in...
Being motivated mainly by the LHC physics, the currently used Monte Carlo Event Generators (MCEGs) lack of the quark spin degree of freedom in their hadronization models. In the recent years, however, the importance of quark spin related effects in hadronization such as the Collins effect has been brought to light by a vivid theoretical and experimental activity. Remarkably, global analyses of...
