Index of /~marat/ps/software

 Name                    Last modified       Size  Description

 Parent Directory        10-Dec-2006 14:31      -  
 cut4.f                  22-Aug-2003 19:14     2k  
 kinem.f                 22-Aug-2003 19:13    21k  

This R-function (strictly speaking, this is not an "R-function" -- this is 
a function that was derived using R-functions min(x1, x2, ...)), was used 
in the analysis of the E89044 (3He(e,e'p)) experiment. The flat acceptance 
region for both spectrometers (for coincidence events) is defined with 
the cut R > 0.002. For each spectrometer the function implements 11 linear cuts:
3 cuts limiting delta_tg
2 cuts limiting theta_tg
4 cuts limiting phi_tg in the (ph_tg, y_tg) plane
2 cuts limiting phi_tg in the (ph_tg, delta_tg) plane
Note that the E89044 experiment used cut -3.5 cm < reactz < 3.5 cm to remove 
contributions from the aluminum walls of the unpolarized "tuna can" 3He target, 
this is the cut effectively limiting y_tg.

Cuts on the left (electron) and right (hadron) spectrometers are identical, for 
a total of 22 linear cuts.

File "cut4.f" defines the function as a PAW function (it was used for placing 
the R > 0.002 cut on data); the file "kinem.f" defines MCEEP variable "RF" equal 
to the value of the function (this variable was used for placing the cut R > 0.002 
on simulation). To make the variable get calculated in MCEEP, it has to be declared in 
several other MCEEP files -- see MCEEP manual.

Detailed discussion of this "cut function", including its efficiency, is my PhD thesis, at
http://www.jlab.org/~marat/ps/thesis/   and
http://www.mit.edu/~maratr/thesis/