== Example: Z' Search at LHC ==
Choose the model
{{{
model = Zprime
}}}
Setup aliases for partons (quarks and gluons) and leptons (electrons and positrons)
{{{
alias pr = u:d:s:c:gl:U:D:S:C
alias lepton = e1:E1
}}}
Look at e+e--pairs created by colliding all possible parton pairs
{{{ 
process zp_drell_yan = pr, pr => e1, E1
}}}
Set values for the model parameters (mass and width of the Z')
{{{
mZH = 1500 GeV
wZH = 50 GeV
}}}
Define reasonable cuts
{{{
cuts = all Pt >= 50 GeV [lepton]
       and all -2.5 <= Eta <= 2.5 [e1:E1]
       and all M >= 800 GeV [e1,E1]
}}}
Define the process scale 
{{{
scale = 1500 GeV
}}}
Set up the beams (full energy LHC with default lhapdf structure functions
{{{
sqrts = 14 TeV
beams = p,p => lhapdf
}}}
integrate the cross sections in order to initialize the phase space grids for similation
{{{
integrate (zp_drell_yan) { iterations = 6:20000 }
}}}
choose weighted events for smoother histograms
{{{
?unweighted = false
}}}
define title etc. as global variables, that will be used by PLOT
{{{
$description =
  "A WHIZARD 2.0 Example.
   Cuts: $p_T^\ell\ge50 \textrm{ GeV}$, $M_{\ell\ell} \ge$800 GeV, 
         $|\eta(\ell)|\le2.5$
         \newline Using weighted events to produce smooth 
   distributions."
$ylabel = "$N_{\textrm{events}}$"
}}}
allocate plots
{{{
$title = "$Z'$ Drell-Yan dilepton peak $pp\to \ell\ell$"
$xlabel = "$\theta^{\ell}$/GeV"
histogram m_lepton (1 TeV, 2 TeV, 50 GeV)

$title = "$Z'$ Drell-Yan: $p_T$ distribution of the $\ell$"
$xlabel = "$p_T^{\ell}$/GeV"
histogram pt_lepton (100 GeV, 2000 GeV, 100 GeV)

$title = "$Z'$ Drell-Yan: Angular distribution of the $\ell$"
$xlabel = "$\theta^{\ell}$/rad"
histogram th_lepton (0, 3.1415, 0.157)
}}}
and tell WHIZARD what to store in them
{{{
analysis = record m_lepton (eval M [e1,E1]) and
           record pt_lepton (eval Pt [e1]) and
           record th_lepton (eval Theta [e1]) 
}}}
simulate 100000 events
{{{
n_events = 100000
simulate (zp_drell_yan)
}}}
write results to file (and run LaTeX to produce plots etc.)
{{{
$analysis_filename = "Zprime"
}}}

WHIZARD will produce histograms in the
[http://projects.hepforge.org/whizard/trac/attachment/wiki/ExampleZprime/Zprime.pdf PDF output] and as [http://projects.hepforge.org/whizard/trac/attachment/wiki/ExampleZprime/Zprime.dat data file].  The progress can be monitored on the terminal and in the
[http://projects.hepforge.org/whizard/trac/attachment/wiki/ExampleZprime/whizard.log WHIZARD log file].