BCAL reconstruction 01/16/2012

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Revision as of 16:29, 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. Must sum several DBCALTruthCell to correspond with one DBCALPoint.

Compare DBCALPoint with summed DBCALTruthCell for corresponding cells.

Z resolution

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

Zdiff vs E point.png

Plot 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 ???

Look at (z_point-z_truthcell) for a region near the top of the peak:

Zdiff histo6.png

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