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To run Sherpa, create a directory and an appropriate run card in it:

Code Block

language	none
title	Run.dat

# The following generates p p -> t t~ tau+ tau-
(run){
  # ATLAS general parameters
  MASS[6]=172.5
  MASS[23]=91.1876
  MASS[24]=80.399
  WIDTH[23]=2.4952
  WIDTH[24]=2.085
  SIN2THETAW=0.23113
  MAX_PROPER_LIFETIME=10.0
  MI_HANDLER=Amisic
  # Events to generate?
  EVENTS = 1000
  # Output fully showered events in HEPMC format, with this filename prefix
  HEPMC2_GENEVENT_OUTPUT = ttll-hi
  # Output "short" (initial parton level) events in HEPMC format, with this filename prefix
  HEPMC2_GENEVENT_OUTPUT = ttll-hi
  # take tau mass into account
  MASSIVE[15] = 1
}(run)

(beam){
  # beams are protons at 7 TeV each
  BEAM_1 = 2212; BEAM_ENERGY_1 = 7000;
  BEAM_2 = 2212; BEAM_ENERGY_2 = 7000;
}(beam)

(processes){
  # collide light quarks/gluons (93) to top, antitop, tau, antitau, and up to two additional light quarks/gluons
  Process 93 93 -> 6[a] -6[b] 15 -15 93{2};
    # on shell top -> W b
    DecayOS 6[a] -> 5 24;
    DecayOS -6[b] -> -5 -24;
    # matrix element/showering match with CKKW prescription
    CKKW sqr(30/E_CMS)
    # enhance rates for final states with seven and eight partons - events will be weighted
    Enhance_Factor 2.0 {7}
    Enhance_Factor 5.0 {8}
    # Factorization/renormalization scales: loose prescription for high multiplicity states
    Scales LOOSE_METS{MU_F2}{MU_R2} {8}
    # Allow larger error for high multiplicity states
    Integration_Error 0.1 {7,8}
  End process;
}(processes)

(selector){
  # Dilepton mass between 7 GeV and CM energy
  Mass 15 -15 7.0 E_CMS
}(selector)

(mi){
  # Multiple interactions on
  MI_HANDLER = Amisic  # None or Amisic
}(mi)

You can then create a SLURM batch submission file and submit:

Code Block

language	none
title	batch_script


#!/bin/bash
#SBATCH -J my-process
#SBATCH -o my-process.txt
#SBATCH -n 160
#SBATCH -p normal
#SBATCH -t 24:00:00
# launch on 160 cores, you have 24 hours max for job.  In practice it's a hybrid process (1 process per node, 16 threads per process).
ibrun /work/02130/ponyisi/sherpa-intel/bin/Sherpa MPI_COMBINE_PROCS=16

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