Examination of the strangeness contribution to the nucleon magnetic moment

Journal Article · Thu Jul 01 04:00:00 EDT 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.015201· OSTI ID:20695608

Xiangsong, Chen ^[1]; Timmermans, Rob G.E. ^[2]; Weimin, Sun; Fan, Wang ^[3]; Hongshi, Zong ^[4]

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1. Department of Physics, Sichuan University, Chengdu 610064 (China)
2. Theory Group, Kernfysisch Versneller Instituut, Zernikelaan 25, NL-9747 AA Groningen (Netherlands)
3. Department of Physics and Center for Theoretical Physics, Nanjing University, Nanjing 210093 (China)
4. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080 (China)

We examine the nucleon strangeness magnetic moment {mu}{sub s} with a lowest order meson cloud model. We observe that (1) strangeness in the nucleon is a natural requirement of the empirical relation {mu}{sub p}/{mu}{sub n}=-3/2, which favors an SU(3) octet meson cloud instead of merely the SU(2) pions. (2) In a consistent perturbative calculation, the quark vertex contribution to {mu}{sub s} is divergently positive, the meson cloud contribution to {mu}{sub s} is divergently negative, and the sum is convergent and negative. (3) In the rest frame of the nucleon, {mu}{sub s} cannot be separated into a quark part and an antiquark part, neither can {mu}{sub s} be calculated via the spin and orbital angular momentum of the strange quarks and antiquarks. (4) While the overall sign of {mu}{sub s} is under debate, the spin part of {mu}{sub s} (which is related to the strange quark tensor charge) is better known to be negative.

• OSTI ID: 20695608
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 70; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
MAGNETIC MOMENTS
NUCLEONS
ORBITAL ANGULAR MOMENTUM
PERTURBATION THEORY
PIONS
S QUARKS
SPIN
STRANGENESS
SU-3 GROUPS
TENSORS