[Halld-cal] BCAL energy correction
wilevine at jlab.org
Tue Nov 5 17:03:25 EST 2013
Following up on our discussion at the meeting today. Currently the
following energy correction procedure is used in the BCAL
1) After the clustering stage we have the "raw energy" E_raw, which is
just the sum of the energies of the individual hits in the cluster. We
also have a z-position of the cluster. These are the two inputs used.
2) The corrected energy is calculated as:
E_corrected = (E_raw/A(z))^(1/(1+e(z))
3) The scale factor A(z) and the nonlinearity e(z) are functions of z
and are parameterized by fourth-order polynomials.
This correction is discussed briefly in
. I've looked into this more recently and found that this procedure
has some issues for certain ranges of z and E. I will try to put
together some plots that show the problem.
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