pmiss

Pmissing 04/20/06

The missing momentum in SIMC and the Analyzer are wrong and do not agree with each other. For example, the Analyzer Pmoop is simply the Pmissing directed along the lab y axis. This is incorrect, because the out-of-plane component is perpendicular to the plane defined by the three momentum transfer and the beam direction. And, in SIMC, Pmper is never negative.

I define:

Pmpar is Pmissing dot unit q
Pmper is Pmissing dot unit [q cross (q cross P_e)]
Pmoop is Pmissing dot unit [q cross P_e]

All vectors are three-vectors.

This was added to both SIMC (event.f) and the Analyzer (c_physics.f). Additions to the code have the date 4/20/06.

I checked that these distributions were approximately the same as the default Pm variables in the anayzler. They were reasonably close, except that Pmper and Pmoop were the negative of the default values.

I checked the default and new distributions in SIMC. Pmpar is the same, Pmoop is the negative of the default value, and Pmper can not be compared very well because SIMC is wrong. The distribution of the absolute value of the new pmper the same as the default pmper.