User name A. Deur
Log entry time 00:14:54 on June15,2001
Entry number 63137
keyword=Elastic cross sectionHere the results of the analysis on the elastic cross sections.
I analyzed only three runs for each arm.
The blue circles are the experimental cross sections. The triangles are the expectation.
For the expectation: Nitrogen contamination is corrected for. Radiative effects are simulated. Acceptance of the spectrometer are folded in the simulation. I took 100% as the detector efficiency (I am cuting only on the cerenkov: there is not too much pion under the elastic peak ! I checked that the trigger efficiency is close to 100% (about 99.7%) and I am taking event from both main and junk triggers anyway). The target density is taken from the pressure broadning measurement corrected for the temperature.
For the left arm, the averaged measured Xsection is 0.089 uB while the expectation is 0.089 uB (The good agreement is pure luck. I guess we alrady have at least 5% uncertainty in the target density)
For the right arm, the averaged measured Xsection is 0.103 uB while the expectation is 0.098 uB.
FIGURE 1
