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Changes between Version 24 and Version 25 of WorkBook/Tutorials/Student


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Timestamp:
09/10/19 15:17:03 (13 months ago)
Author:
mselvaggi
Comment:

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  • WorkBook/Tutorials/Student

    v24 v25  
    8383d) What does it decay into?
    8484
    85 e) For each decay channel define an event selection (the signal region) that maximises the significance of observation of this new state.  A signal and background sample can be downloaded here:
     85e) For each decay channel define an event selection (the signal region) that enhances the significance of observation of this new state. A signal and background MonteCarlo samples can be downloaded here:
    8686
    8787{{{
     
    9292f) For each decay channel, express the cross section times branching ratio as a function of the number of observed events (Nobs) and the number of background events (Nb) in the signal region, the integrated luminosity (L) and the event selection efficiency.
    9393
    94 g) How would you measure the background yield (Nb) from this data sample?
     94g) Express the number of background events in the signal region as function on the number of background events in some control region and the selection efficiency of background events in both the signal and control region. For both the decay channels.
    9595
    96 h) How would you measure the signal efficiency?
     96h) Measure the background yield (Nb) from this data in "control region" using the data sample.
    9797
    98 i) Compute the cross-section of this process with the available data. 
     98i) Measure the selection efficiency of background events in both the signal and control region
    9999
    100 j) Produce a stacked plot of data signal and background in all the decay channels
     100j) Derive the background yield in the signal region.
    101101
    102  
     102k) Measure the signal efficiency.
     103
     104l) Compute the cross-section of this process with the available data in each decay channel.
     105
     106m) Compute the uncertainty on the cross section in each channel.  including the uncertainties. It is a good custom to split the various uncertainty contributions into statistical, systematic, and luminosity.
     107Assume 3% luminosity uncertainty. Assume 1% uncertainty on the muon efficiency and % for the electron efficiency.
     108
     109n) compute the ratio of the branching ratios into electrons and muons (with the associated uncertainties)
     110
     111o) Produce a stacked plot of data signal and background in both the decay channels (hint: use THStack class of root)