<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I use the following number.<div><br></div><div>BR for Xi(1820)->Lambda K: 0.3</div><div>BR for Lambda--> p pi: 0.64</div><div>I assume the vertex efficiency (Lambda-->ppi) is 0.7.</div><div><br></div><div>The KKKp channel for Xi(1820) is now 0.6% in the proposal. Still good. </div><div><br></div><div>If somebody can clarify whether fastMC included kaon decay, it would be great.</div><div><br></div><div>Lei<br><div><div>On Apr 6, 2012, at 5:06 PM, Johann Goetz wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">I think you are right, and I don't know if this was taken into account in the fastmc. Maybe Mike knows this? Also to answer Lei's question, the BR for Xi to Lambda/K and the BR for Lambda to p/pi is not taken into account. I think we can assume 50% for the Xi decay and 64% for the Lambda decay. This gives us these numbers:<br>
<br>detected particles / % acceptance<br><br><br>
BR for Xi and Lambda included:<br>
K+ K+ K- p / 1.49 %<br>
K+ K+ K- pi- / 0.96 %<br> K+ K+ K- / 5.99 %<br><br><br>BR for Xi and Lambda, and kaon decay included (IF its not in fastmc already):<br>
K+ K+ K- p / 0.19 %<br>
K+ K+ K- pi- / 0.12 %<br>
K+ K+ K- / 0.75 %<br><br><br><div class="gmail_quote">On Fri, Apr 6, 2012 at 2:57 PM, John Price <<a href="mailto:jprice@csudh.edu">jprice@csudh.edu</a>> wrote:<br>
<blockquote class="gmail_quote">Hi John:<br>
<br>
Dumb question: how far does a kaon have to travel in order to be<br>
detected? The 5m path length of kaons in CLAS leads to a 50%<br>
probability that they will decay before hitting the SC. This would mean<br>
that we would have a theoretical maximum of 12.5% detection efficiency<br>
for a K+K+K- final state.<br>
<br>
No doubt, the geometry of CLAS12 is different than that of CLAS, but I<br>
don't know off the top of my head how different it is.<br>
<br>
John<br>
<div><div><br>
On Fri, 2012-04-06 at 11:51 -0700, Johann Goetz wrote:<br>
> OK, here it is. sorry for the delay in getting this out.<br>
><br>
> I generated 300k of the following reaction:<br>
><br>
> g p --> Xi-(1820) K+ K+<br>
> Xi-(1820) --> Lambda K-<br>
> Lambda --> p pi-<br>
><br>
> The Xi-(1820) was generated via a massive and broad Y* state with a<br>
> t-slope of about 1.9 (consistent with g11/g12 results for t-slope of<br>
> Xi-(1530)). The generator was the Pluto (root-based) library and the<br>
> efficiency calculator was the fastmc in Mike's home directory.<br>
><br>
> detected particles / % acceptance<br>
> K+ K+ K- p / 4.66 %<br>
> K+ K+ K- pi- / 0.30 %<br>
> K+ K+ K- / 18.73 %<br>
><br>
> --<br>
> Johann.<br>
</div></div><font color="#888888">--<br>
John W. Price<br>
Professor and Chair of Physics<br>
CSU Dominguez Hills<br>
<a href="tel:310-243-3403">310-243-3403</a><br>
<br>
</font></blockquote></div><br><br clear="all"><br>-- <br><a href="http://sites.google.com/site/theodoregoetz/">Johann T. Goetz, PhD.</a><br><a href="mailto:jgoetz@ucla.edu">jgoetz@ucla.edu</a><br>
Nefkens Group, UCLA Dept. of Physics & Astronomy<br>Hall-B, Jefferson Lab, Newport News, VA<br>
Office: <a href="tel:757-269-5465">757-269-5465</a> (CEBAF Center F-335)<br>Mobile: <a href="tel:757-768-9999">757-768-9999</a><br><br>
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