Journal
PHYSICAL REVIEW D
Volume 87, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.054032
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Funding
- DFG [SFB/TR 16]
- European Community-Research Infrastructure Integrating Activity Study of Strongly Interacting Matter (acronym HadronPhysics3) under the Seventh Framework Programme of EU [283286]
- ERC [259218 NUCLEAREFT]
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We analyze the low-energy spin structure of the nucleon in a covariant effective field theory with explicit spin-3/2 degrees of freedom to third order in the small scale expansion. Using the available data on the strong and electromagnetic width of the Delta resonance, we give parameter-free predictions for various spin polarizabilities and moments of spin structure functions. We find an improved description of the nucleon spin structure at finite photon virtualities for some observables and point out the necessity of a fourth-order calculation. DOI: 10.1103/PhysRevD.87.054032
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