Changes between Version 5 and Version 6 of MC4BSM

04/04/12 14:28:09 (7 years ago)



  • MC4BSM

    v5 v6  
    1 Installation instructions and pre-workshop exercises
    2 Instructions for the on-site exercise
    3 Final result from the on-site exercise
    5 [ Links to all tutorial presented at the MC4BSM conferences]
    8  == Installation instructions and pre-workshop exercises ==
     3== !MC4BSM tutorial ==
    10  === Install on Windows ===
    11 The different program are foreseen to run on !Linux/Mac. If you don't have Linux or Mac, the best solution is to install Linux (I would advice to install Ubuntu) in dual boot and follow the instructions for Linux.
    12 This video might help you to do so:
    13 virtual machine are fine, but quite often the library readline is not present on the system. This package is not mandatory but allozs mg5 to have history and nice auto-completions.
    14 So you might consider to install that library first and the compile python2.6.
     5The tutorial consists in implementing the so-called ''Hill Model'', described in [ hep-ph/0603082], into !MadGraph, and to simulate the full chain down to PGS level events for a sample of ''tt~h'' events at the !LHC. A very brief description of the model can be found [attachment:MC4BSM_FeynRules.pdf here].
     7   * The !MC4BSM [ website].
     9=== Implementing the model into !FeynRules ===
     11[ FeynRules]  is a Mathematica® package that allows the calculation of Feynman rules in momentum space for any !QFT physics model. The Feynman rules calculated by the code can then be used to implement the new physics model into other existing tools, such as MC generators.
     13Usefull material for the tutorial:
     15   * A ready-to-go !FeynRules model file for the Hill model: [].
     16   * An example notebook of how to run !FeynRules: [attachment:MC4BSM.nb.tar.gz MC4BSM.nb].
     17   * A short introduction to implementing new models into !FeynRules, and how to run the !MadGraph interface: [attachment:MC4BSM_FeynRules.pdf MC4BSM_FR.pdf].
     19=== Generating parton level events with MG/ME ===
     21After the model has been implemented into !FeynRules, it can easily be exported to !MadGraph via the corresponding !FeynRules interface. The model can then be used just like any other built-in !MadGraph model.
     23In this tutorial we use the !FeynRules implementation of the Hill model to generate a sample of ''pp>tt~h1'' events at the !LHC @ 14TeV.
     25   * A short introduction of how to import !FeynRules models into MG/ME: [attachment:MG_MC4BSM.pdf MC4BSM_MG.pdf].
     27=== Decaying the BSM particles with BRIDGE ===
     29We can use [ BRIDGE] to
     31   * Compute the branching ratios and the decay tables for the BSM particles contained in the Hill model.
     32   * Decay the ''tt~h1'' final state obtained in the previous step.
     34=== Pythis and PGS ===
     36Finally, we can run [ Pythia] and [ PGS] to obtained hadron-level and detector level events.
    17  === Install on Linux ===
    19   * '''python 2.6/2.7'''[[BR]]
    20     !MadGraph 5 requires python 2.6 or python 2.7. In order to check your version of python, you can type:
    21     python --version. Some of the repositories are still on python 2.5. So if updating python via your repository manager didn't work.
    22     you can download directly python from the following link:
    24     and follow instructions.
    25   * '''Madgraph5'''[[BR]]
    26     You will find madgraph5 package on the following page:
    27     For this program, you just need to untar it.
    28     To check if mg5 is correctly install you directly try to run it by doing:
    29     ./bin/mg5
    30     If you don't have a valid python version. It will fail directly.
    31   * '''MadAnalysis'''[[BR]]
    32     This programs is not mandatory but allows to have partonic distributions done automatically.
    33     In order to install this program, you need to launch mg5 (./bin/mg5) and then type
    34 {{{
    35    install MadAnalysis
    36 }}}
    38  === Install on !MacOs ===
    40 1. '''Basic program'''
    41   * perl
    42   * bash [[BR]]
    43   Those programs are by default present in any Mac distribution,
    44   but just in case you should check that they are all installed in your computer (by doing perl --version).
    45   * gmake [[BR]]
    46   By default, makefile are not recognize on mac. In order to check, you can do 'make --version'. If it says:
    47   -bash: make: command not found
    48   then you should install it. The easiest is to install the xcode.
    49      1. For !MacOs 10.5:
    50      2. For !MacOs 10.6:
    51      3. For !MacOs 10.7:
    52   In order to be able to download it, you will need to a apple developer account (which is free)
    53   * gfortran 4.x (To check the version do gfortran do: gfortran --version)
    54   This program is often not included in standard mac version. In order to download it, you can download it from:
    55     a. for !MacOs 10.7
    56     b. for !MacOs 10.6
    57     c. for !MacOs 10.5
    59 2. '''!MadGraph5'''
    60   * '''python'''
    61     a. The default python version of !MacOs 10.6 is python 2.6 and is (in 99% of the case) fully working with Madgraph5, so nothing to install for you.
    62     b. The python version of !MacOs 10.7 is python 2.7. And this one works perfectly, so nothing to install for you.
    63     c. For other version of MacOS, you will need to install python2.7 from the python web site:
    64   * '''Madgraph5'''[[BR]]
    65     You will find madgraph5 package on the following page:
    66     For this program, you just need to untar it.
    67     To check if mg5 is correctly install you directly try to run it by doing:
    68     ./bin/mg5
    69     If you don't have a valid python version. It will fail directly.
    70   * '''MadAnalysis'''[[BR]]
    71     This programs is not mandatory but allows to have partonic distributions done automatically.
    72     In order to install this program, you need to launch mg5 (./bin/mg5) and then type
    73 {{{
    74    install MadAnalysis
    75 }}}
    77  === pre-workshop exercises ===
    78   As a pre-workshop exercises and a proof that the full instalation is succesfull.
    79   Please launch mg5
    80   ./bin/mg5
    81   and type the following command:
    82 {{{
    83    tutorial
    84 }}}
    85   and follow the tutorial instructions on the screen.
    88  == Instructions for the on-site exercise ==
    90    * If you don't have run the tutorial before the lectures please do it now.
    91      Please launch mg5
    92      ./bin/mg5
    93      and type the following command:
    94 {{{
    95    tutorial
    96 }}}
    97      and follow the tutorial instructions on the screen.
    99    * The exercice of this tutorial is to
    100      1. Use the model generatedby Feynrules
    101      2. generate $ p p \to U \bar U $
    102      3. generate some events
    103      4. pass the events to Pythia
    104      5. Restart the chain but this time by including all the decay chain in MG5.
    106    Note that in order to have the correct cross-sections in the second cases or to have the correct branching ratio computed by Pythia in the first case, we need first to compute the width and the branching ratio of the non standard model particles.
    108    * '''The model'''[[BR]]
    109      The simple way to have access to a model in MG5 is to put in the directory: MG5_DIR/models
    110      after that you can simply import it in MG5 by doing
    111 {{{
    112    import model MODELNAME
    113 }}}
    114      or
    115 {{{
    116    import model MODELNAME --modelname
    117 }}}
    118      The option --modelname tells MG5 to use the name of the particles defines in the UFO model, and not the usual MG5 conventions for the particles of the SM and the MSSM. In principle this shouldn't change anything in the model that you load.
    119      For the first time that you import a new model, it's allow a good points to test it. For this
    120      1. It's advice to run MG5 in debug mode (./bin/mg5 --debug)
    121      2. It's useful to test the Lorentz invariance/Gauge invariance/... of at least a couple of processes. This is one examples:
    122 {{{
    123    import model MODELNAME
    124    check p p > urv urv~
    125 }}}
    127    * ''' Computation of the width and branching ratio'''
    128      The first element in order to have a valid generations is to have valid input parameters. This includes in particular to have the correct width (and the correct branching ratio for Pythia).
    129      If you tell all the channel of desintegration, MG5 is able to compute all those parameters.
    130 {{{
    131    import model MODELNAME
    132    generate urv > u p1
    133    add process urv > u p2
    134    add process [ADD all 1->2 decay and relevant 1->3 decay, for both interesting particles]
    135    output
    136    launch
    137 }}}
    138    This will creates to you one valid param_card with the computed width and the computed branching ratio.
    139    Note that the solution (and the valid files to produces it are in attachment of this page)
    140    Note that particles which doesn't have a specify decays keeps the width defines by the UFO Model. This might be problematic for p1 (If you don't set the width of p1 to zero in the model)
    142   * '''Generation of events (Decay done in pythia)'''
    143 {{{
    144    import model MODELNAME
    145    generate p p  > urv urv~
    146    output
    147    launch
    148 }}}   
    149     One of the questions will be to ask you if you want to edit the param_card. At this stage, you can enter the path of the previously created param_card.dat.
    151   * '''Generation of events (Decay done in MG5)'''
    152     Add the decay in MG5 (such that the full spin correlation is taken into-account) and generate events.
    153     In order to learn the syntax of the decay chain. Please type
    154 {{{
    155     help generate
    156 }}}
    157     Solution in attachments.
     42-- Main.ClaudeDuhr - 14 Apr 2009