<div dir="ltr">Hello Matt,<div><br></div><div>I understand your concern that something has changed in the MC, but other things could have changed as well, for example the cluster algorithm in the fcal or the nonlinear correction applied to the reconstructed fcal cluster energy. Any of these would change the behavior of the results I show.</div><div><br></div><div>Do you have a technical note to show what was done and the details of the simulations that were used?</div><div><br></div><div>-Richard Jones</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 25, 2019 at 7:11 AM Shepherd, Matthew <<a href="mailto:mashephe@indiana.edu">mashephe@indiana.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>Hi Richard,</div>
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<div>My understand is that you have reproduced the effect that I originally documented: the energy response of the FCAL in the MC somehow changed and is now not correctly calibrated. This is the original observation that motivated the issue. From
what I can tell, you seem to have verified that there is a problem. </div>
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<div>This problem was first documented in this log entry:</div>
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<div><a href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flogbooks.jlab.org%2Fentry%2F3621347&data=02%7C01%7Challd-cal%40jlab.org%7C0be6acac2cf4485272ff08d6b11512f4%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636891101422170387&sdata=4tXQZksm%2BCOH5BDtuLrbauBMQn%2Ff1Gmf7Ll8uGVMGM8%3D&reserved=0" originalSrc="https://logbooks.jlab.org/entry/3621347" shash="yYoOCCaS0bgw3/R6dUKP1UX+JHzIBOi7yvFkf/GihcO3B/pzcWpn5YqAZscmZ2wMAh65yVBrTDYqnQWggTrbp+rAZg9BDNpu/bloGHCWGw67uMzLB8mGJ3XR8XqKgUxLcrF4AbkBrSoxrw+LYslevw//ujdo+W/LGcc+D8bkZb0=" target="_blank">https://logbooks.jlab.org/entry/3621347</a></div>
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<div>What I really wanted to know is: why did the response of the FCAL in the MC change? For this, we have seem to have no answer.</div>
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<div>So, we can retune the MC calibration of FCAL and mark the issue as "resolved." But without understanding the reason the issue emerged, then it may sneak up again.</div>
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<div>On Mar 23, 2019, at 4:39 PM, Richard Jones <<a href="mailto:richard.t.jones@uconn.edu" target="_blank">richard.t.jones@uconn.edu</a>> wrote:</div>
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<div dir="ltr">Hello Matt and all,
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<div>I have updated my FCAL mc response study to single-photon events (0-8 GeV) in the forward direction. This shows the final adjustment in the energy scaling factors in hdgeant and hdgeant4. Unless I hear something to the contrary, I consider the
energy scale issue reported on github Jeffersonlab/hdgeant4 to be resolved, if someone could agree and make it as resolved.</div>
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<div>Also shown in the updated report is a new timing comparison study, where I used the position recorded for the fcal shower together with the mc generated vertex information to produce a time-of-flight corrected shower time, which should be zero
if the reconstruction and simulation are consistent. Notice that there is still a residual time-walk that we might want to understand and correct.</div>
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<div><a href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhalldweb.jlab.org%2Fdoc-private%2FDocDB%2FShowDocument%3Fdocid%3D3852&data=02%7C01%7Challd-cal%40jlab.org%7C0be6acac2cf4485272ff08d6b11512f4%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636891101422190395&sdata=HtpDatM8rXtrUYg3e5TLnhDif4l7E5LZBwtt2kgkba8%3D&reserved=0" originalSrc="https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3852" shash="dlJimIM9B7FEMMYnwOCzaLZlZY7t2E/l41ScVOhnSi6ij4tgLzLMIbhwFVtzxw7gEitx0bS4CGT4z7YT3nIhI2F9jIT1Krw9l5piPY7bRCOQQkKnACgUcJ69DSvBSXNuhDyQThLPz0ZQfuPJ0dZCtk+KCPn+1iy3g+OiWRVRD50=" target="_blank">https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3852</a><br>
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<div>-Richard Jones</div>
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