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Thanks Garth,
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<div class="">I am interested and would like to participate. I am trying to go through the proposal </div>
<div class="">in more detail (backward angle meson production is pretty interesting to me — I spent a </div>
<div class="">little time years ago on the omega analysis from the original Hall C experiments).</div>
<div class=""><br class="">
</div>
<div class="">i already have a few questions but would like to wait to ask you. Still please add my</div>
<div class="">name to the proposal. I would like to be involved.</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>pete<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Jun 3, 2020, at 9:50 PM, Garth Huber <<a href="mailto:huberg@uregina.ca" class="">huberg@uregina.ca</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div class="">Note: This message originated from outside the FIU Faculty/Staff email system.<br class="">
<br class="">
<br class="">
Dear Colleagues,<br class="">
<br class="">
We are inviting you to provide comments and hopefully join our new experimental<br class="">
proposal before submitting it to PAC 48.<br class="">
<br class="">
The proposal can be downloaded from:<br class="">
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__lichen.phys.uregina.ca_-7Ehuberg_pizero_PAC48-5Fpi0-5Fproposal.pdf&d=DwICaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=QxP5KTzkAiDxkNbQw9W17g&m=qho3NbSI7EBBkswZ3AGkQdLk9WPnOJoYXx5FFNauLV8&s=X9I-PYwiZz-_pOelaR9oNtYBdqYF7iBd9ST7rWaai08&e=" class="">https://urldefense.proofpoint.com/v2/url?u=http-3A__lichen.phys.uregina.ca_-7Ehuberg_pizero_PAC48-5Fpi0-5Fproposal.pdf&d=DwICaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=QxP5KTzkAiDxkNbQw9W17g&m=qho3NbSI7EBBkswZ3AGkQdLk9WPnOJoYXx5FFNauLV8&s=X9I-PYwiZz-_pOelaR9oNtYBdqYF7iBd9ST7rWaai08&e=</a><br class="">
<br class="">
In a short summary, this is standard hall C L/T measurement: standard HMS+SHMS<br class="">
configuration, standard unpolarized LH2 target and standard accelerator<br class="">
gradient (2.2 GeV/pass). The proposed run time is 674 PAC hours. Technically,<br class="">
the experiment is as straightforward as an L/T-separation experiment ever gets.<br class="">
<br class="">
The unique aspect of this measurement is we aim to probe the nucleon structure<br class="">
at the backward-angle (t=t_max, u'=0) through exclusive process: 1H(e,e'p)pi0<br class="">
above the resonance region (W>2), x=0.36. In this interaction picture, the<br class="">
recoil nucleon absorbs most of the induced momentum and is detected in the<br class="">
spectrometer at forward angles, while the scattered electron will be detected<br class="">
in other spectrometer (typically the HMS). The backward pi0 (CM frame) is<br class="">
produced 180 degree opposite to the q-vector (central proton momentum) almost<br class="">
at rest, and is identified from the missing mass. You could call it a "knocking<br class="">
a proton out of a proton process".<br class="">
<br class="">
We aim to perform L/T separation at Q^2 range of 2-5 GeV^2, and two additional<br class="">
measured for check the W and Q^2 scaling.<br class="">
<br class="">
The objectives of the measurement are as follows:<br class="">
<br class="">
1. Demonstrate the existence of a backward-angle (t=t_max) peak in the<br class="">
exclusive 1H(e,e'p)pi0 cross section above the resonance region. The<br class="">
kinematics have been selected to facilitate comparison to forward angle<br class="">
exclusive pi0 data from E12-13-010, and the ideas behind the experiment have<br class="">
been presented previously at NPS Collaboration meetings.<br class="">
<br class="">
2. Once the backward angle peaks are confirmed, the separated cross sections<br class="">
sigma_T and sigma_L at Q^2 =2, 3, 4 and 5 GeV^2 will be used to confirm the<br class="">
dominance of sigma_T over sigma_L, one of the predictions of the backward angle<br class="">
collinear factorization regime (Transition Distribution Amplitudes=TDA).<br class="">
<br class="">
3. Perform a sigma_T~1/Q^n scaling test for 2<Q^2<6.25 GeV^2, which would<br class="">
further validate or refute the TDA factorization, and hopefully identify the<br class="">
scale at which the factorization regime is reached.<br class="">
<br class="">
If you have suggestions for improvement, please send them to us no later than<br class="">
June 17, and please include the relevant line number in your comment.<br class="">
<br class="">
We are looking forward to have your support for this proposal.<br class="">
<br class="">
Many thanks,<br class="">
<br class="">
Bill (Wenliang) Li, <a href="mailto:billee@jlab.org" class="">billee@jlab.org</a><br class="">
Justin Stevens, <a href="mailto:jrstevens@jlab.org" class="">jrstevens@jlab.org</a><br class="">
Garth Huber, <a href="mailto:huberg@uregina.ca" class="">huberg@uregina.ca</a><br class="">
<br class="">
--<br class="">
Dr. Garth Huber, Dept. of Physics, Univ. of Regina, Regina, SK S4S0A2, Canada.<br class="">
tel: 1-306-585-4240. fax: 1-306-585-5659.<br class="">
<br class="">
_______________________________________________<br class="">
Hallc mailing list<br class="">
<a href="mailto:Hallc@jlab.org" class="">Hallc@jlab.org</a><br class="">
https://urldefense.proofpoint.com/v2/url?u=https-3A__mailman.jlab.org_mailman_listinfo_hallc&d=DwICAg&c=lhMMI368wojMYNABHh1gQQ&r=GbQjY3Pcc5hOhorqJZdTwQ&m=88IVD4hDmY0XIf7Mm0nrkw5e32uwX2t2CvFdEmr_MRM&s=6u36TKU_AqCqWziJkiwf6NAN610dwlcF2CSczzhvZac&e=<br class="">
</div>
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</blockquote>
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Dr. Pete Markowitz, Professor of Physics and Fellow of the Honors College<br class="">
Florida International University<br class="">
11200 S.W. 8th Street, Office No.<br class="">
Miami, FL 33199<br class="">
P: (305) 348-1710 | E: <a href="mailto:markowit@fiu.edu" class="">markowit@fiu.edu</a><br class="">
</div>
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