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Title: Exploring Hyperon Structure with Electromagnetic Transverse Densities

Abstract

Here, 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 π the transverse densities are computed using a new method that combines chiral effective field theory (χEFT) and dispersion analysis. The peripheral isovector densities arise from two-pion exchange, which includes the ρ resonance through elastic unitarity. The isoscalar densities are estimated from vector meson exchange (ω,Φ). We find that the “pion cloud” in the charged Σ hyperons is comparable to the nucleon, while in the Ξ it is suppressed. The Λ–Σ 0 transition density is pure isovector and represents a clear manifestation of peripheral two-pion dynamics.

Authors:
 [1];  [2];  [3];  [2]
  1. Johannes Gutenberg Univ., Mainz (Germany)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Univ. de Valencia-CSIC, Valencia (Spain)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1462191
Report Number(s):
JLAB-THY-18-2641; DOE/OR/23177-4343; arXiv:1802.00479
Journal ID: ISSN 0177-7963; PII: 1434; TRN: US1902112
Grant/Contract Number:  
AC05-06OR23177; PROMETEOII/2014/0068; FIS2014-51948-C2-2-P; SEV-2014-0398
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Few-Body Systems
Additional Journal Information:
Journal Volume: 59; Journal Issue: 6; Conference: 11th International Workshop on the Physics of Excited Nucleons (NSTAR 2017), Columbia, SC (United States), 20-23 Aug 2017; Journal ID: ISSN 0177-7963
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Hiller Blin, Astrid N., Alarcon, Jose Manuel, Vicente Vacas, Manuel J., and Weiss, Christian. Exploring Hyperon Structure with Electromagnetic Transverse Densities. United States: N. p., 2018. Web. doi:10.1007/s00601-018-1434-3.
Hiller Blin, Astrid N., Alarcon, Jose Manuel, Vicente Vacas, Manuel J., & Weiss, Christian. Exploring Hyperon Structure with Electromagnetic Transverse Densities. United States. doi:10.1007/s00601-018-1434-3.
Hiller Blin, Astrid N., Alarcon, Jose Manuel, Vicente Vacas, Manuel J., and Weiss, Christian. Wed . "Exploring Hyperon Structure with Electromagnetic Transverse Densities". United States. doi:10.1007/s00601-018-1434-3. https://www.osti.gov/servlets/purl/1462191.
@article{osti_1462191,
title = {Exploring Hyperon Structure with Electromagnetic Transverse Densities},
author = {Hiller Blin, Astrid N. and Alarcon, Jose Manuel and Vicente Vacas, Manuel J. and Weiss, Christian},
abstractNote = {Here, 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/Mπ the transverse densities are computed using a new method that combines chiral effective field theory (χEFT) and dispersion analysis. The peripheral isovector densities arise from two-pion exchange, which includes the ρ resonance through elastic unitarity. The isoscalar densities are estimated from vector meson exchange (ω,Φ). We find that the “pion cloud” in the charged Σ hyperons is comparable to the nucleon, while in the Ξ it is suppressed. The Λ–Σ0 transition density is pure isovector and represents a clear manifestation of peripheral two-pion dynamics.},
doi = {10.1007/s00601-018-1434-3},
journal = {Few-Body Systems},
issn = {0177-7963},
number = 6,
volume = 59,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: Unitarity relation for the isovector spectral function on the two-pion cut.

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Works referenced in this record:

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.