09/15/2004

• Playing with the acceptance cuts:
  
• applying theta/phi cuts does not change the x-section shape;
• applying delta cuts changes the shape of x-section:
  
• 14% -- smaller drop on low Ep edge;
  
• 12% -- again smaller drop on the low Ep edge;
  
• 10% -- smooth at the low Ep edge, but high Ep edge starts to raise;
• Problem stays, and I have run out of ideas.

• Extracted F2, shown below:
  
  
  
• Extracted Q^2-dependence of F2:
  
• For each plot, data points from top to bottom have increasing x_bj, and from left to right have increasing theta;
• The three (or four) data points connected together have the same x_bj, of which the x_bj value is shown as "key" for every three set (try matching the color);
• Each set is offset by multiple of the value shown on the y-axis label, the lowest set (highest x_bj) has the smallest offset (1x0.00518 for LD2 and 5x0.00609 for C12).
  
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• Don't plan to do more on the x-section until the low Ep problem is solved, however, not smart enough to solve it by myself;
• Set up on-line x-section analysis;
  
• Check all normalizations;