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- (Note: If
and 
, i.e., origin
z midpoint between chambers, then a and b are uncorrelated.)
- However, the origin, z=0 (in our experiment E110 at Fermilab),
was a convenient surveyor's mark and so was not chosen to minimize
correlation.
- In the case of many measurement chambers, the slope and
intercept will still be correlated but there will be no simple way to get
rid of it.
- In practice, it is important to keep full correlation
matrix.
- For instance, estimation of best vertex from intersection of
several tracks needs the full matrix.
Geoffrey Fox, Northeast Parallel Architectures Center at Syracuse University, gcf@npac.syr.edu