Changes between Version 3 and Version 4 of FAQ-NewPhysics-1
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- Apr 13, 2012, 6:50:15 PM (12 years ago)
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FAQ-NewPhysics-1
v3 v4 3 3 == How can I implement a new physics model in MadGraph / MadEvent ? == 4 4 5 === The "old" way : using 6 {{{ 7 USRMOD 8 }}} 9 v1 === 10 This is "traditional" way to create a new physics model in MadGraph / MadEvent v4. You should use the 11 {{{ 12 USRMOD 13 }}} 14 template directory present in the 15 {{{ 16 Models 17 }}} 18 directory. The full procedure to follow is extensively described [http://cp3wks05.fynu.ucl.ac.be/Manual/usrmod.html here]. 5 === The "old" way : using **USRMOD v1** === 6 This is "traditional" way to create a new physics model in MadGraph / MadEvent v4. You should use the **USRMOD** 7 template directory present in the **Models** directory. The full procedure to follow is extensively described [http://cp3wks05.fynu.ucl.ac.be/Manual/usrmod.html here]. 19 8 20 9 This method has been successfully used over the past to create several new Physics models. However, it presents two important disadvantages: 21 10 * The base model is always the SM and the possible modifications are restricted (e.g. removing a particle is not possible). This was due to the important structural differences in the original BSM models provided with MadGraph / MadEvent v4. 22 11 * Feynman rules should be computed by hand. 23 To address these issues, two new methods are now available and should be preferentially used (starting from the future version 4.6, old models files, including those produced with the 24 {{{ 25 USRMOD 26 }}} 27 v1, will only be passively supported). 12 To address these issues, two new methods are now available and should be preferentially used (starting from the version 5.0, old models files, including those produced with the 13 **USRMOD v1** will only be passively supported). 28 14 29 === The "new" way : using [http://feynrules.phys.ucl.ac.be FeynRules] and/or 30 {{{ 31 USRMOD 32 }}} 33 v2 === 15 === The "new" way : using [http://feynrules.phys.ucl.ac.be FeynRules] and/or **USRMOD v2** === 34 16 35 17 ==== [http://feynrules.phys.ucl.ac.be FeynRules] ==== … … 40 22 Thanks to its high capabilities, including a user friendly interface, the automatized model generation for arbitrary QFT physics theories and robust validation procedures, [http://feynrules.phys.ucl.ac.be FeynRules] and the corresponding interface will be the default tool to generate important MadGraph / MadEvent models starting from version 4.6. 41 23 42 ==== 43 {{{ 24 ==== **USRMOD** v2 ==== 25 In order to keep the 44 26 USRMOD 45 }}} 46 v2 ==== 47 In order to keep the 48 {{{ 27 approach flexibility with the new models produced by the [http://feynrules.phys.ucl.ac.be FeynRules] package, a new independent version of the 49 28 USRMOD 50 }}} 51 approach flexibility with the new models produced by the [http://feynrules.phys.ucl.ac.be FeynRules] package, a new independent version of the 52 {{{ 29 scripts, called 53 30 USRMOD 54 }}}55 scripts, called56 {{{57 USRMOD58 }}}59 31 v2, has been released. The "philosophy" remains the same, i.e. starting from a base model, the user add/remove/modify particles, interactions and/or parameters, then run the script and finally edit the relevant coupling expressions. 60 32 61 33 Compare to the first version, it has the following advantages: 62 34 * Fully compatible with (and ''only'' with) all models produced by [http://feynrules.phys.ucl.ac.be FeynRules], so the base model can be the SM but also any other model previously produced, including those produced by the 63 {{{64 35 USRMOD 65 }}}66 36 v2 itself! 67 37 * No limitation for the possible modifications. The 68 {{{69 38 USRMOD 70 }}}71 39 v2 propose to first save a "copy" of the base model and adjust all files to reflects the user changes. 72 40 * Safer thanks to additional internal consistency checks
