<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Timothy,<div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><div class=""><b class="">RF</b> - 6722 has extreme outlier for rftime electron FD mean cause by seemingly empty histogram due to low statistics. Low lumi run. Is this okay?</div></div></div></div></blockquote><div>According to the logbook and RCDB, this is a random trigger run. I think it can be dropped from the timelines.</div><br class=""><blockquote type="cite" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">
<div class=""><b class="">FT</b> - 6724, 6725 are both empty target runs and have double peaks in the pi0 mass spectrum, causing the average mass to be very low (it fit the first peak). Is this okay? I know we wanted to focus on the special runs being produced
well for pass 2.</div></div></div></blockquote><div>This is caused by the fact in FT reconstruction the particle vertex is assumed to be the target center. In empty target runs, we get a lot of hits from the scattering chamber exit window for which the vertex assumption is wrong, resulting in this shifted peak.</div><div>I will see if we can modify the fitting algorithm to fit the right peak. Otherwise, I think everything looks good.</div><div><br class=""></div><div>Best regards,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Raffaella</div></div><br class=""></div></body></html>