crossx

The executable main calculates the cross section for pp → 𝜒^0 𝜒^+.

the modes of main are

qdep
    Calculates the cross section for various values of Q.
cross
    Calculates the cross section.
dsigma  
    Calculates dsigma/dcos(theta).

they are called by

main qdep  [[OPTIONS]] input file
main cross [[OPTIONS]] input files
main dsigma [[OPTIONS]] input file

Calculating cross sections for various values of Q.

The mode qdep calculates the cross section for pp → 𝜒^0 𝜒^+ with values from Q = qmin..qmax GeV.

Flags for qdep

-sqrts	
     center of mass energy in GeV. (default: LHC √s = 14 TeV)
-o	
     output file (default: stdout)
-pdf	
     pdf which should be used. (default: cteq6ll)
-pdfType
     pdf type: LHGrid or LHPdf (default: LHGrid)
-N
     number of monte carlo integration iterations (default: 5000000)
-qmin
     minimal value of Q in GeV (default: 100)
-qmax
     maximal value of Q in GeV (default: 500)
-steps
     number of different Q (default: 10)
-neutralino
     selects neutralino (default: 2)
-chargino
     selects chargino (default: 1)
-v
     verbose output

Example

main qdep -o file.dat -N 100000 input.lhe

Calculating the cross section.

The mode cross calculates the cross section for pp → 𝜒^0 𝜒^+.

Flags for cross

-sqrts
      center of mass energy in GeV. (default: LHC √s = 14 TeV)
-o
      output file (default: stdout)
-pdf 
      pdf which should be used. (default: cteq6ll)
-pdfType 
      pdf type: LHGrid or LHPdf (default: LHGrid)
-N 
      number of monte carlo integration iterations (default: 5000000)
-Q
      factorization scale in GeV. (default: 0.0)
      If Q equals 0.0 Q will be set to the average of the two neutralino masses.
-neutralino
     selects neutralino (default: 2)
-chargino
     selects chargino (default: 1)
-v
     verbose output

Example

main cross -o file.dat input1.lhe input2.lhe input3.lhe

Calculates dsigma/dcos(theta)

The mode dsigma calculates the differential cross section for qq_ → 𝜒^0 𝜒^+.

Flags for dsigma

-sqrts
      center of mass energy in GeV. (default: LHC √s = 14 TeV)
-o
      output file (default: stdout)
-quarks
      initial state quarks. Expected "ud", "cs" (default: "ud")
-samples  
      the sampling rate of dsigma/dcos(theta). (default: 30)
-neutralino
     selects neutralino (default: 2)
-chargino
     selects chargino (default: 1)
-v
     verbose output

Requirements

• lhapdf Since lhapdf is a C++ library you need to have a callback library written in C to link it with go. You can create this library with the Makefile in hep/pdf and you have to install the resulting libpdf.so in your library path (e.g. /usr/local/lib)
• The default pdf used by crossx is cteq6ll. Thus you have to install them with lhapdf if you want to use the default ones.