The eqn: A = R / G (acceptance = reconstructed / generated) is done for each energy bin seen in the plots. The events simulated was exactly:<div> gamma p --> Xi- K+ K+</div><div>and the Xi- was allowed to decay according to geant. So the events were exclusively Xi- signal events. We did not put any effort into reproducing the background shape which is extremely complicated and may not be quite possible yet (it would appear that the background in Fig. 3.37 consists mostly of real physics events and not just pion misidentification, though its unclear what these events really are)</div>
<div><br></div><div>The simulated flux actually followed the shape of the excitation function of the Xi- quite well though it hardly matters since I did not do any angular distribution analyses for instance. This might be done after i give my defense to get the differential cross section, but then we'll need a better event generator than the one I used.</div>
<div><br></div><div>I hope that answered your questions, and thank you for taking the time to look at my thesis!<br><br><div class="gmail_quote">On Thu, Oct 7, 2010 at 2:02 PM, <<a href="mailto:mher@jlab.org">mher@jlab.org</a>> wrote:<br>
<blockquote class="gmail_quote"><br>
Dear Johann,<br>
<br>
Very nice and detail work! It was useful to read.<br>
<br>
I have few questions about Eq 4.5 in section 4.1.2 Acceptance.<br>
Probably it is very naive, for me is not clear how you have done it:<br>
<br>
you selected exclusive events from MM(K+K+) and then for exact that region<br>
divided MC Reconstructed to generated?<br>
<br>
it was done for given photon energy bin only ?<br>
or you have another bin/cut also ?<br>
<br>
Thank you in advance,<br>
best regards,<br>
Mher<br>
<br>
p.s. I am in g12 list, but I am not working on g12 so, even if i will make<br>
some comments fill free to ignore.<br>
<br>
>> > here is the updated version:<br>
>> > <a href="http://www.jlab.org/~goetz/thesis_draft5.7.pdf">http://www.jlab.org/~goetz/thesis_draft5.7.pdf</a><<a href="http://www.jlab.org/%7Egoetz/thesis_draft5.7.pdf">http://www.jlab.org/%7Egoetz/thesis_draft5.7.pdf</a>><br>
>> ><br>
>> > what are you opinions on this? Thank you,<br>
>> > Johann.<br>
<br>
<br>
</blockquote></div><br><br clear="all"><br>-- <br>Johann Goetz<br><a href="mailto:jgoetz@ucla.edu">jgoetz@ucla.edu</a><br>UCLA Dept. Physics & Astronomy<br>Nefkens Group<br>
</div>