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Changes between Version 18 and Version 19 of WorkBook/Tutorials/Student


Ignore:
Timestamp:
09/09/19 15:11:02 (13 months ago)
Author:
mselvaggi
Comment:

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  • WorkBook/Tutorials/Student

    v18 v19  
    7575== 2) Characterisation of a BSM excess
    7676
    77 - The provided data corresponds to LHC events that contains at least two isolated leptons (lepton=electron/muon) with pT > 15. Prove it!
     77a) The provided data corresponds to LHC events that contains at least two isolated leptons (lepton=electron/muon) with pT > 15. Prove it!
    7878
    79 - The data contains the equivalent of an integrated luminosity of 60 pb-1. It contains an excess corresponding to a new physical state. Find the observable that makes this excess explicit.
     79b) The data contains the equivalent of an integrated luminosity of 60 pb-1. It contains an excess corresponding to a new physical state. Find the observable that makes this excess explicit.
    8080
    81 - What is the new particle's mass?
     81c) What is the new particle's mass?
    8282
    83 - What does it decay into?
     83d) What does it decay into?
    8484
    85 - For each decay channel define an event selection (the signal region) that maximises the significance of observation of this new state. 
     85e) For each decay channel define an event selection (the signal region) that maximises the significance of observation of this new state. 
    8686
    87 - 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.
     87f) 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.
    8888
    89 - How would you measure the background yield (Nb) from this data sample?
     89g) How would you measure the background yield (Nb) from this data sample?
    9090
    91 - How would you measure the signal efficiency?
     91h) How would you measure the signal efficiency?
    9292
    93 - Compute the cross-section of this process with the available data. 
     93i) Compute the cross-section of this process with the available data. 
    9494
    95 - Produce a stacked plot of data signal and background in all the decay channels
     95j) Produce a stacked plot of data signal and background in all the decay channels
    9696
    9797