ar X iv : n uc l - th / 0 20 80 08 v 1 5 A ug 2 00 2 SAID RESULTS FOR GDH - RELATED SUM RULES
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چکیده
Model-dependence of the single-pion contribution to the GDH, Baldin, and forward spin-polarizability sum rules is explored, using the most recent SAID multipole analysis. Results from SAID and MAID are compared. We have calculated the GDH, Baldin and forward spin-polarizability (γ 0) sum rules using our most recent analysis of single-pion photoproduc-tion data. This set of integrals is useful in revealing discrepancies, as the integrands are weighted by different powers of the photon energy. Values are tabulated below. Results are given over the threshold region and full energy range to illustrate where differences are most pronounced. For the charged-pion contribution, this threshold component is comparable to the full result. Table 1. Comparison of the SM02 1 and recent MAID2000 2 calculations for the GDH and Baldin integrals and the forward spin polarizability from threshold to 2 GeV (for MAID to 1.25 GeV) [left set] and from threshold to 200 MeV [right set] displayed as SAID/MAID.
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تاریخ انتشار 2002