[Primex2] group tdc in silicon runs

[Yang Zhang]

Dear collaborators,

In the following link are group tdc timing distribution against tagger
timing and the multiplicity with hycal cluster energy cut at 0.5 GeV. The
efficiency doesn't improve with the cut. But I will use it anyway like in
the veto situation, whenever group tdc works I will exclude out of timing
(group tdc - tagger timing) pi0s and see if the background can be reduced.

https://www.jlab.org/primex/weekly_meetings/primexII/slides_2015_03_13/gtdc_dist_w_energy_cut.pdf

Best

Yang

On Thu, Mar 12, 2015 at 1:08 AM, Yang Zhang <yzhang132 at gmail.com> wrote:

> Dear collaborators,
>
> The file in the following link are some plots for group tdc behind
> crystals from all silicon production runs.
>
>
> https://www.jlab.org/primex/weekly_meetings/primexII/slides_2015_03_13/gtdc_dist.pdf
>
> For each Hycal cluster, the program looks for the corresponding group tdc
> timing information. If there is a group tdc hit for this cluster, it is
> then paired with tagm timing to get group tdc t - tagm. The tagm timing is
> selected in such a way that it has coincidence with hycal trigger and the
> tdiff between these two is within -6 to 6 ns. The distributions of the
> group tdc t-tagm are plotted on the left of each page in the file.
>
> On the right are the multiplicity, meaning the number of group tdc timing
> and tagm timing pair for each corresponding hycal cluster (so the entries
> in the statistic box are total number of clusters on this group tdc). From
> those plots we can see the group tdc efficiency is not very good.
>
> Please let me know if you have any comment.
>
> Best
>
> Yang
>
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