hs-pileup

#!/bin/bash
# HepSim toolkit. S.Chekanov (ANL) 
# Task: Mix signal events with pileup events

export HEPSIM_DIR=$(dirname $0)

if which java >/dev/null; then
    _java=java
elif [[ -n "$JAVA_HOME" ]] && [[ -x "$JAVA_HOME/bin/java" ]];  then
    _java="$JAVA_HOME/bin/java"
else
    echo "No java detected! Please install it from https://java.com/download"; exit 0
fi

if [[ "$_java" ]]; then
    version=$("$_java" -version 2>&1 | awk -F '"' '/version/ {print $2}')
    if [[ "$version" < "1.7" ]]; then
        echo "Java version is less than 1.7. Please update it."; exit 0;
    fi
fi

# argument list:
# 1st:  pN - mix N events using a Poisson distribution
#          - if "p" missing, use a constant number
# 2nd:  signal.promc  - signal file
# 3rd   minbias.promc - file with min bias events 
# 4th   ouput.promc   - ouput file with mixed events
# barcode indicates particle origin. 0 means the signal event.
$_java -Xms1024m -Xmx1024m -cp $HEPSIM_DIR/browser_promc.jar hepsim.MixPileup "$@"