Stranger Still: Kaon Loops and Strange Quark Matrix Elements of the Nucleon
Journal Article
·
· Zeitschrift fuer Physik C
OSTI ID:954375
Instrinsic strangeness contributions to low-energy strange quark matrix elements of the nucleon are modelled using kaon loops and meson-nucleon vertex functions taken from nucleon-nucleon and nucleon-hyperon scattering. A comparison with pion loop contributions to the nucleon electromagnetic (EM) form factors indicates the prsence of significant SU-(3)-breaking in the mean-square charge radii. As a numerical consequence, the kaon loop contribution to the mean square Sachs strangeness radius is significantly smaller than could be observed with parity-violating elastic ep experiments planned for CEBAF, while the contribution to the Sachs radius is large enough to be observed with PV electron scattering from (0+, 0) nuclei. Kaon loops generate a strange magnetic moment of the same scale as the isoscalar EM magnetic moment-a scale large enough to be observed at CEBAF-and a strange axial vecctor form factor having roughly one-third of the magnitude extracted from vp/vp elastic scattering
- Research Organization:
- Thomas Jefferson Lab National Accelerator Facility
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 954375
- Report Number(s):
- CEBAF-TH-93-01; hep-ph/9301229
- Journal Information:
- Zeitschrift fuer Physik C, Journal Name: Zeitschrift fuer Physik C Vol. 61
- Country of Publication:
- United States
- Language:
- English
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