Changes between Initial Version and Version 1 of PY8Kernel

Timestamp:

Apr 9, 2021, 9:31:39 AM (3 years ago)

Author:

Olivier Mattelaer

Comment:

--

PY8Kernel

@@ +1 @@
+== Py8Kernel Plugin
+
+
+This provide a curated C++ matrix element outputs.
+
+=== Installation
+
+It can be downloaded at:
+
+ * lp:~py8team/+junk/PY8Kernels_plugin
+then copy the plugin you obtained from the launchpad branch "as a" (and not "in a") folder named `PY8Kernels` in the "PLUGIN' directory.
+
+ * via the command (to be run from the PLUGIN directory)
+bzr branch lp:~py8team/+junk/PY8Kernels_plugin 
+ * from within MG5aMC@NLO (from version 3.2)
+install PY8Kernels_plugin
+
+
+=== Tutorial
+
+
+It  can be used as follows:
+
+```
+./bin/mg5_aMC --mode=PY8Kernels
+PY8Kernels > add process p p > d d~ j QED<=0
+PY8Kernels > add process p p > z > d d~ QED<=2
+PY8Kernels > output PY8MEs tmp_test
+PY8Kernels > exit
+
+cd tmp_test/Processes_sm/
+make check
+./check
+```
+
+yielding:
+
+```
+Opened slha file param_card_sm.dat for reading
+sm model parameters independent of event kinematics:
+mdl_WH = 0.006382339
+mdl_WW = 2.0476
+[...]
+Testing the non-existence of a non-available process:
+ -> Process '33 43 > 2 5 > 33 2 1 5' is not available.
+
+Testing the evaluation of available processes:
+ -> Process '21 21 > 1 -1 21' is available.
+ | Momenta:
+ | 1 7.50000000000000e+02 0.00000000000000e+00 0.00000000000000e+00 7.50000000000000e+02
+ | 2 7.50000000000000e+02 0.00000000000000e+00 0.00000000000000e+00 -7.50000000000000e+02
+ | 3 6.87868181828160e+02 2.54179830464520e+02 5.69480493117298e+02 -2.90253711975379e+02
+ | 4 5.46099931105227e+02 -2.74948039397878e+01 -5.21556451979051e+02 1.59524411638062e+02
+ | 5 2.66031887066613e+02 -2.26685026524732e+02 -4.79240411382473e+01 1.30729300337317e+02
+ | Matrix element : 1.86539034007620204e-04 GeV^-2
+[...]
+ -> Process '3 -3 > 23 > 1 -1' is available.
+ | Momenta:
+ | 1 7.50000000000000e+02 0.00000000000000e+00 0.00000000000000e+00 7.50000000000000e+02
+ | 2 7.50000000000000e+02 0.00000000000000e+00 0.00000000000000e+00 -7.50000000000000e+02
+ | 3 7.50000000000015e+02 6.13712352994589e+02 -3.72213384149096e+02 2.17518607117062e+02
+ | 4 7.49999999999997e+02 -6.13712352994571e+02 3.72213384149107e+02 -2.17518607117045e+02
+ | Matrix element : 4.23176199133015046e-03 GeV^0
+```
+
+For now, the example driver file `check_sa.cpp` together with the function prototypes of the C++ headers should already help understand how the generated library `../lib/libPY8MEs_sm.a` is organised and intended to be linked+used.
+
+In particular, I made it very easy to access a particular process simply by supplying the list of incoming and outgoing PDGs, and there is also facilities for easily accessing color-ordered Matrix elements and for specific helicities.
+It can basically function as an API for accessing any ME.