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<h1>Example Tutorial 1 : ZH -->Dimuons + H  recoil mass analysis</h1>

<i>version 0.91, John Yoh, (Norman Graf), 12/21/06, updated 1/18/07</i>

<p><b>Thanks to Norman  Graf for providing the analysis code for this example

<p>This simple example program looks at a ILC 500 GeV ZH (with Z--> MuMu) dataset, extract
events with 2 muons within cuts, and, for those events with M(MuMu) between 86 and 96 GeV,
calculate the reoil mass (which should be the 120 geV Higgs). Note that there is a high
tail in the recoil mass--so that only roughly 1/4 of the events are in the 120 GeV
Higgs mass peak--due to beamstrahlung  (initial and final state radiation, which
effectively reduce the Root(S) of the interaction to below 500 GeV, thus leading to a 
spuriously high recoil mass (if we were able to take into account  the missing gammas in the recoil
mass calculation, that would lead to the 120 GeV Higgs mass). 


<ol>
 <li>Make sure that you have Java and JAS3 loaded into your PC/laptop properly--and tested

 <li>In general, it would be easier if you store both the datafile and .java file in the
   disk area where your JAS3 "open file" points to

 <li>download the data file 
<br>
panpyZmumuh120-0-500_SLIC_v2r0p6_sid00.slcio
<br>from 
<br>

<a href="ftp://ftp-lcd.slac.stanford.edu/lcd/ILC/ILC500/Zh120/sid00/slcio/slic">
ftp://ftp-lcd.slac.stanford.edu/lcd/ILC/ILC500/Zh120/sid00/slcio/slic</a>

<br>Note :  take the ...Zmumuh120... file !!! not the first ones---
this is a 115 MB file which contains 500 events of Z-->MuMu + Higgs at
root(S) of 500 GeV--with detector (SiD) simulation;
there are also 19 other files of similar process for a total of 10k events; these files
are great candidates for browsing with the LCSIM event browser, and wire 4 displays. 

 <li>Now download the .java file 

<br> HiggsRecoilMass.java    ---  from

<br><a href="http://docdb.fnal.gov/ILC-public/DocDB/ShowDocument?docid=378">ILC-doc-378</a>
(Note : there are also 2 other .java programs for tutorial 2 below) 

<li>Now run JAS3, "Open file"  data file above, "open file" HiggsRecoilMass.java, compile (right click
inside HiggsRecoilMass.java window), load (right click), and click on > on upper bar.

<li>Your analysis should be running--you can double click on some histograms to see them incrementing.

<li>The code is rather simple, so you should be able to undertand them and modify them.

<li>play with the code--adding new histograms or cuts, etc.--enjoy

</ol>


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