<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Marco's comments.<div><br></div><div><br><div><br><div>Begin forwarded message:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>From: </b></span><span style="font-family:'Helvetica'; font-size:medium;">Marco Battaglieri <<a href="mailto:battaglieri@ge.infn.it">battaglieri@ge.infn.it</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>Date: </b></span><span style="font-family:'Helvetica'; font-size:medium;">April 30, 2012 11:50:01 AM EDT<br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>To: </b></span><span style="font-family:'Helvetica'; font-size:medium;">"Lei Guo (<a href="mailto:lguo@jlab.org">lguo@jlab.org</a>)" <<a href="mailto:lguo@jlab.org">lguo@jlab.org</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>Cc: </b></span><span style="font-family:'Helvetica'; font-size:medium;">"Hicks, Kenneth" <<a href="mailto:hicks@ohio.edu">hicks@ohio.edu</a>>, Keith Griffioen <<a href="mailto:griff@jlab.org">griff@jlab.org</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1);"><b>Subject: </b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>Re: FW: proposal</b><br></span></div><br><div>Dear Lei and other 'very' strange,<br>I'm on the same wave-length of Keith's comments: the proposal is valuable but can be (easily) improved.<br><br>- Physics motivation: I found it still weak. You should find some deeper reason to justify the Omega measurement other than say that it was not well measured before (I'm clearly exaggerating!). The argument of creating the 3s from scratch is intriguing and probably you may expand to link it to some basic properties of the valence vs sea quarks in baryons. I'm sure there is a huge literature backing to the '60 and '70 that you can cite to make a stronger physics case.<br>The same for the cascade physics. What are we learning with them? Again the mass splitting of doublets is a quantitative argument<br>but it is not worked out in details when you report the expected results: is the resolution of CLAS12 good enough to conclude anything on that? you run simulations and therefore you should be able to report about the expected mu-md difference. If the CLAS12 resolution is not good enough, skip this detailed discussion in pg 11 and replace with some other argument.<br>What about the link with the missing baryon physics studied for more than 10 years with the CLAS detector? Is the cascade physics able to provide information about this long-debated topic? I think so.<br>I found also very interesting the possibility to measure the elastic scattering omegaN and csiN: It is only reported in Par.D pg 20 but again nothing in the final part about expected results.<br><br>- Cross section calculation: I liked the summary in page 26 because we all know that predictions can vary by order of magnitude and checking that different models give more or less the same xsecs is reassuring. I would do something similar to the cascade part. Here you also have real experimental data on your side and it should be easy to give a brief paragraph summarizing the expected cross sections.<br><br>- effect of the photon energy: it is not evident how the proposal wold benefit from the increased energy of JLab12: is the energy dependence a valuable information for omega and cascade physics or you just need to be over the production threshold? are you summing all the energy together or binning? this should be clearly stated in the proposal.<br><br>- The measurement: you should describe making very clear what you can do with the untagged beam and what with the tagged photons. Pg 36 Sec D. is confusing in my opinion, mixing luminosity of tagged and untagged photon beam. I would rather highlight the physics results you want to achieve and then say that here you can use untagged photons and there you need tagged photons ...<br>-- show the expecetd results on a plot with simulated points and error bars to let the reader judge the quality of the new measurement.<br>-- background: I completely agree with Keith comment. You need to make clear that the measurement is almost bg free. If possible increase MC statistic of bg in fig 23-24-25: the huge fluctuation obtained scaling the low statistic sample makes the picture unclear capturing the attention not on the primary message (signal/bg ratio) but why the bg has such big un-statistical fluctuation!<br>-- detrmination of spin/parity: here you really need to support the method by showing results projected on CLAS12 acceptance. You mentioned the DMA technique but it is not clear to me how well it works with CLAS12 kinematic coverage and the expected statistics. Need to be completed.<br>If there is not time to obtain presentable MC results I would skip this part.<br><br>- While I found the FT part concise and well written (just check the consistency of FT-Trck everywhere and use the same notation, not FT-CAL but FT-Cal, FT-Hodo and FT-Trck), giving a e flavor of the detector and its role in CLAS12, there is nothing referring to CLAS12 for hadron detection. You may want to add some kinematic plot showing the 7 particle phase-space and how it is covered by CLAS12. For a non-expert reader, beside the acceptance (fig 22), I would sketch the kinematic of one reaction (eg the omega production) showing K momenta and angular distribution. You say nothing about kaon identification: is the k momentum low enough to safely use the standard CLAS12 Pid in an effective way? or do you need (the) new rich detector? since you rely on massive kaon detection I would spend few words on it.<br><br>I would leave to a check-speller the misspelled words and Keith's detailed comments for rewording and phrase changing.<br><br>Again, the proposal is well written and I'm sure you just need some extra work to do a greta job.<br><br>Cheers<br>Marco<br></div></blockquote></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>**************************************</div><div> @</div><div> / *</div><div> / ___ ___ Lei Guo _______________________</div><div> L_O_/ ____ Florida International University____/_/</div><div> \ | Physics Dept., CP 212 / /</div><div> / \ | Miami, FL 33199 / / /</div><div> / I_/ \ ____ USA _____ /______/__________/ /</div><div> / / L / / / / /</div><div> / / / / / / /</div><div> /_/__________/______/______/__________/_/</div><div>/_/__________/______/______/__________/_/</div><div>305-348-0234(o)</div><div><br></div><div>**************************************</div><div><br></div></div></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline">
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