<div dir="ltr">Dear collaborators,<div><br></div><div>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.</div><div><br><div><a href="https://www.jlab.org/primex/weekly_meetings/primexII/slides_2015_03_13/gtdc_dist_w_energy_cut.pdf">https://www.jlab.org/primex/weekly_meetings/primexII/slides_2015_03_13/gtdc_dist_w_energy_cut.pdf</a><br></div></div><div><br></div><div>Best</div><div><br></div><div>Yang</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Mar 12, 2015 at 1:08 AM, Yang Zhang <span dir="ltr"><<a href="mailto:yzhang132@gmail.com" target="_blank">yzhang132@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><span style="font-size:12.8000001907349px">Dear collaborators,</span><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">The file in the following link are some plots for group tdc behind crystals from all silicon production runs.</div><div style="font-size:12.8000001907349px"><br></div><div><span style="font-size:12.8000001907349px"><a href="https://www.jlab.org/primex/weekly_meetings/primexII/slides_2015_03_13/gtdc_dist.pdf" target="_blank">https://www.jlab.org/primex/weekly_meetings/primexII/slides_2015_03_13/gtdc_dist.pdf</a></span><br></div><span class=""><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">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.</div><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">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.</div><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">Please let me know if you have any comment.</div><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">Best</div><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">Yang</div></span></div>
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