Calculate the number of
J/psi -> mu+mu-, psi(2s) -> mu+mu-, upsilon(1s)
-> mu+mu-, and Z -> mu+mu- events in this file.
Note that you need to subtract background and you should not
forget errors in your estimates.
Question 2 :
Plot electromagnetic(EM) energy deposit by mu+ and mu-.
From this plot, estimate the thickness of the EM calorimeter if
it is made of Lead.
Question 3 :
Plot hadronic energy deposit by mu+ and mu-.
From this plot, estimate the thickness of the hadron calorimeter if
it is made of Steel.
Question 4 :
Estimate the fraction of resonances coming from B-meson
decays. This can be done by looking at decay length distributions
of the resonances. The average will be zero if there
are no B-meson contributions, and positive if there are.
Follow the procedure below :
Since the silicon device provides a good resolution for the
decay length measurement, we should start with events which have
good silicon hits associated with positive and negative muon.
Use the following cuts psvxct >= 7 and
msvxct >= 7.
Then make the decay length plot between -2 mm and +2 mm
in the resonance (J/psi, Upsilon(1s), Z) mass region.
The variable name for this
is "dl" (unit = cm).
Background distribution needs to be subtracted.
For this, we can plot "dl" distribution outside of the resonance
mass region. Find that it is enhanced in the
positive side. Explain the reason.
Now you have
backround subtracted decay length plot. The negative side of the plot
represents the detector resolution. You expect the similar plot
in the positive side due to the resolution.
Now you can make "-dl" plot from the negative dl distribution, and
subtract it from the positive dl distribution.
The remaining distribution will be due to the long-lived B-mesons.