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

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

Thanks to Norman Graf for providing the analysis code for this example

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).

  1. Make sure that you have Java and JAS3 loaded into your PC/laptop properly--and tested
  2. 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
  3. download the data file
    panpyZmumuh120-0-500_SLIC_v2r0p6_sid00.slcio
    from
    ftp://ftp-lcd.slac.stanford.edu/lcd/ILC/ILC500/Zh120/sid00/slcio/slic
    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.
  4. Now download the .java file
    HiggsRecoilMass.java --- from
    ILC-doc-378 (Note : there are also 2 other .java programs for tutorial 2 below)
  5. 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.
  6. Your analysis should be running--you can double click on some histograms to see them incrementing.
  7. The code is rather simple, so you should be able to undertand them and modify them.
  8. play with the code--adding new histograms or cuts, etc.--enjoy
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