Publications
Publication Information
| Title | Exploring hyperon structure with electromagnetic transverse densities |
| Authors | Astrid Hiller Blin, Manuel Vicente Vacas, Christian Weiss |
| JLAB number | JLAB-THY-18-2641 |
| LANL number | arXiv:1802.00479 |
| Other number | DOE/OR/23177-4343 |
| Document Type(s) | (Meeting) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Meeting Invited Talk Paper compiled for NStar 2017 Journal Compiled for Few Body Systems Volume 59 Page(s) 118 Refereed Proceedings NSTAR 2017—The International Workshop on the Physics of Excited Nucleons Edited By Springer (2018) Refereed Page(s) 118 | |
| Publication Abstract: | We explore the structure of the spin-1/2 flavor-octet baryons (hyperons) through their electromagnetic transverse densities. The transverse densities describe the distribution of charge and magnetization at fixed light-front time and enable a spatial representation of the baryons as relativistic systems. At peripheral distances b ~ 1/M_pi the transverse densities are computed using a new method that combines chiral effective field theory (chiEFT) and dispersion analysis. The peripheral isovector densities arise from two-pion exchange, which includes the rho resonance through elastic unitarity. The isoscalar densities are estimated from vector meson exchange (omega, phi). We find that the "pion cloud" in the charged Sigma hyperons is comparable to the nucleon, while in the Xi it is suppressed. The Lambda-Sigma^0 transition density is pure isovector and represents a clear manifestiation of peripheral two-pion dynamics. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1007/s00601-018-1434-3 |
| Accepted Manuscript: | nstar17_proc.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |