BCAL reconstruction 01/16/2012

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Revision as of 16:35, 16 January 2012 by Wilevine (Talk | contribs) (→‎Z resolution)

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Look at individual DBCALPoint = upstream hit + downstream hit in same BCAL cell, with energy corrected for attenuation, z determined by time difference of the two hits.

Can get "truth" information about how much energy deposited and where from DBCALTruthCell. Since these correspond to SiPM cells, must sum several DBCALTruthCell to correspond with one DBCALPoint.

Compare DBCALPoint with sum of corresponding DBCALTruthCell 's.

Z resolution

Can look at z-resolution (z_point-z_truthcell) vs E_point:

Zdiff vs E point.png

Below are the sigmas of the (z_point-z_truthcell) distributions for different slices of E:

Sigma zdiff vs E point.png

The curve shown is 1.5 cm/sqrt(E), which is already higher than the nominal z-position resolution, sigma_z = 1.1 cm/sqrt(E) .

Something strange going on here ???

Below is (z_point-z_truthcell) for a range of energies in the anomalous region shown above:

Zdiff histo6.png

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