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By Sebastian Kuhn, Jian-ping Chen
This quantity offers an outline of the various new and fascinating effects, either theoretical and experimental, within the quarter of spin constitution features and sum principles at low to reasonable photon virtuality Q2. It comprises contributions from many top scientists within the box around the world. the amount covers the next issues: contemporary effects at the Gerasimov-Drell-Hearn (GDH) sum rule with genuine photons and its extensions to digital photons; inclusive spin constitution features at low to reasonable Q2 and their moments; unique measurements of nucleon spin constitution within the resonance area; spin polarizabilities and Compton scattering; chiral perturbation idea and different low-energy limits of QCD; lattice QCD, duality, and phenomological versions; nuclear results and the GDH sum rule in nuclei; experimental recommendations (polarized objectives and beams); destiny plans and tasks
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In addition it has a useful detection efficiency for neutral pions. In forward direction a silicon microstrip device called MIDAS29 extends the acceptance for charged particles. The GDH-Detector 28 has been specifically designed for measurements of total cross sections and is perfectly suited for situations where the contributing channels are not well known and extrapolations due to unobserved final states are not advisable. The concept of the GDH-Detector is to detect at least one reaction product from all possible hadronic processes with almost complete acceptance concerning solid angle and efficiency.
Kao, D. Drechsel, S. Kamalov, R/I. Vanderhaeghen, Phys. Rev. D, 69, 056004 (2004). 17. V. Bernard, T. R. Hemmert, and Ulf-G. Meissner, Phys. Lett. B545, 105 (2002). 18. d. D. Bjorken, Phys. Rev. 148,1467 (1966). 16 STRUCTURE OF THE NUCLEON: SPIN OBSERVABLES ULF-G. de I discuss the spin structure of the nucleon at low photon virtualities in the framework of a Lorentz-invariant formulation of baryon chiral perturbation theory. The structure functions of doubly virtual Compton scattering are calculated t o oneloop accuracy.
2. Fig. 4 shows a simultaneous fit to both our proton and neutron data via c1 and c2. The result for the proton indicates a sign change at about 2 GeV photon energy as does the data. 8 GeV significantly deviates from the fit which is a consequence of the 4th resonance structure previously discussed. A fit t o the proton data alone does not exhibit this feature 40. There is no polarized data for the neutron a t energies above those where the proton shows the 4th resonance. Hence, the fit to the neutron might be impaired by a similar 4th resonance.