[Halld-cal] [Halld-offline] FCAL calibration changed

[Shepherd, Matthew]

...and a second "heads up" that this will only get
you about the right pi0 mass if you are constructing
your own pi0 four vectors from DFCALCluster objects
(which probably none of you are).

If you use analysis level objects you're going to get
a second nonlinear shift in scale that comes in the
transition from DFCALCluster -> DFCALShower.
That will need adjusting also.. it is on the to-do list.

Matt

---------------------------------------------------------------------
Matthew Shepherd, Associate Professor
Department of Physics, Indiana University, Swain West 265
727 East Third Street, Bloomington, IN 47405

Office Phone:  +1 812 856 5808

> On Dec 1, 2014, at 10:03 AM, David Lawrence <davidl at jlab.org> wrote:
> 
> Hi All,
> 
>  Just a heads up that after consulting with Matt, we changed the base scale factor for the FCAL
> in the CCDB this morning to be a factor of 4 larger than it was. Reconstructed FCAL clusters
> will reflect this change right away if using the MySQL DB. You’ll need to update your SQLite file
> tomorrow (or generate a new one today) if you are using SQLite and want this change.
> 
> This change was made ONLY for runs 1282 and higher. According to Manuel’s very useful
> spreadsheet (log entry 3309319) this is where the HV was changed to adjust the gains.
> 
> Regards,
> -David
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