[Hps-analysis] py/pz reconstruction

[Sebouh Paul]

Here are the plots using tanLambda, for GBL tracks.

On Thu, Mar 31, 2016 at 7:27 PM, Nelson, Timothy Knight <
tknelson at slac.stanford.edu> wrote:

> Hi Sebouh,
>
> Can you please provide the tanLambda plot with appropriately fine binning?
>
> Tim
>
> > On Mar 31, 2016, at 3:17 PM, Sebouh Paul <sebouh.paul at gmail.com> wrote:
> >
> > when using very fine binning, (less than 10 mrad) I see in the spectrum
> of py/pz (which is equivalent to tan_lambda/cos(phi0) )  a sort of regular
> ondulation, but only when looking at electrons in the top half of the
> detector from GBL tracks.
> > The attached screenshots are from v0 skim of run 5772 in pass6.
> >
> > One of the attached screenshots is with the seed tracks (no ondulation),
> the second one is with gbl tracks (which has ondulations only in electrons
> on the top half of the detector), and the third one is a finer-binned zoom
> in of the second graph to highlight the ondulation.
> >
> > Do any of you all have any idea what might be causing this?  This
> happens in both the DST and the LCIO, so it's probably not caused by the
> DST-maker
> >
> > Note:  I also found that if I drop the cos(phi0) from the formula that I
> am plotting, I still see the ondulation, so this might just be something to
> do with tanLambda, and not necessarily the combined formula
> tanLambda/cos(theta)
> >
> > <Screen Shot 2016-03-31 at 5.50.34 PM.png><Screen Shot 2016-03-31 at
> 5.56.34 PM.png><Screen Shot 2016-03-31 at 6.02.06
> PM.png>_______________________________________________
> > Hps-analysis mailing list
> > Hps-analysis at jlab.org
> > https://mailman.jlab.org/mailman/listinfo/hps-analysis
>
>
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