Heavy-quark contribution to the proton's magnetic moment
arXiv:hep-ph/0605055 · doi:10.1016/j.physletb.2007.02.047
Abstract
We study the contribution to the proton's magnetic moment from a heavy quark sea in quantum chromodynamics. The heavy quark is integrated out perturbatively to obtain an effective dimension-6 magnetic moment operator composed of three gluon fields. The leading contribution to the matrix element in the proton comes from a quadratically divergent term associated with a light-quark tensor operator. With an approximate knowledge of the proton's tensor charge, we conclude that a heavy sea-quark contribution to the proton's magnetic moment is positive in the asymptotic limit. We comment on the implication of this result for the physical strange quark.
arXiv comment4 pages, 2 figures
References in corpus (12)
- Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
- Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment
- Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q^2=0.230 (GeV/c)^2
- The Strange Quark Contribution to the Proton's Magnetic Moment
- Precise determination of the strangeness magnetic moment of the nucleon
- Quark helicity flip generalized parton distributions from two-flavor lattice QCD
- The SAMPLE Experiment and Weak Nucleon Structure
- Parity-Violating Electron Scattering and Neucleon Structure
- Stranger Still: Kaon Loops and Strange Quark Matrix Elements of the Nucleon
- Nucleon Structure and Parity-Violating Electron Scattering
- A Lattice QCD Analysis of the Strangeness Magnetic Moment of the Nucleon
- QCD Sum Rule Calculation for the Tensor Charge of the Nucleon
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