A Potential Model Study of the Nucleon's Charge and Mass Radius
arXiv:2405.07077 · doi:10.1016/j.nuclphysa.2024.123012
Abstract
We study the charge and mass distributions within a nucleon and compute the associated squared radii based on a potential model approach. Different constituent quark configurations such as , , and quark-diquark are considered and compared, with model parameters calibrated by experimental measurements of the proton and neutron charge radius. The results suggest that while the charge radius is dictated by quark dynamics, the mass radius is strongly influenced by nonperturbative QCD contributions to a nucleon's mass that are not sensitive to the constituent quarks. As a result, the mass radius could become substantially different from the charge radius. The obtained nucleon mass distributions of different configurations are further used for simulations of the initial conditions in heavy ion collisions. The computed eccentricities and are found to demonstrate a considerable sensitivity to the input nucleon profiles, especially to the mass radius in the peripheral region as well as for systems with fewer participants.
21 pages, 16 figures
References in corpus (11)
- Glauber Modeling in High Energy Nuclear Collisions
- Nucleon Electromagnetic Form Factors
- Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
- The mass radius of the proton
- Nucleon mass radii and distribution: Holographic QCD, Lattice QCD and GlueX data
- Measurement of the neutron charge radius and the role of its constituents
- Extraction of the proton mass radius from the vector meson photoproductions near thresholds
- Predictions on global properties in O+O collisions at the Large Hadron Collider using a multi-phase transport model
- Hadron and light nucleus radii from electron scattering
- Schrödinger spectrum generated by the Cornell potential
- Non-relativistic expansion of Dirac equation with spherical scalar and vector potentials by reconstituted Foldy-Wouthuysen transformation