[Sane-analysis] SANE Analysis Meeting October 26, 2011

[O. A. Rondon]

I have posted a brief report on fitting A1(W,Q^2) data
https://userweb.jlab.org/~rondon/analysis/asym/Q2/A1dis.pdf
using James' table
https://hallcweb.jlab.org/experiments/sane/jmaxwell/oct_18/w_bins_asym_table.txt

The point of the report is to highlight the facts that:
- due to the two beam energies we used, our data tends to group in two
subsets: resonances (mostly the 5.9 GeV data) and DIS (mostly the 4.7
GeV data).

- A1 has a very different behavior, in both W and Q^2, for the
resonances vs DIS, so we should be careful not to lump all data into a
single set, especially when comparing with world data, models and
parameterizations. Duality should be tested with our data, rather than
applied as a given.

- because of this different behavior, we cannot assume a single Q^2
dependence for all our A1 data. Moreover, the proper variable to study
A1 is W, not x, because x mixes different regions of W. A1(x,Q^2) is OK
only for W>2 GeV, but A1(W,Q^2) is valid everywhere.


Cheers,

Oscar