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2013:groups:tools:eventformats

This is an old revision of the document!


Event Format : extended LHE

People involved:

Present state

Sample size: example of ttbar dileptonic @ LHC (10,000 events)

File size (Mo)
LHE (gzip compression) 3.8
STDHEP (gzip compression) 153
HEPMC (gzip compression) 346
simplified LHE (gzip compression) 5.1
LHCO (gzip compression) 1.6
Delphes ROOT 161

Motivations

  • defining a format for jet-clustering output (without fast-simulation detector).
  • defining a format which extends the LHCO content (too few information for performing sophisticated analysis).
  • the new format will take into account all Delphes 3 potential.

Some ideas to discuss

  • Using text format (theorist-friendly format :-D). ROOT is rejected.
  • Keeping the structure of the existing LHE Format (arXiv:hep-ph/0609017) and its XML tags. Name of the format extension: eLHE (e for 'extended') ? Reminder:
<LesHouchesEvents version="X">
<header>
...
</header>
<init>
2212     2212  0.40000000000E+04  0.40000000000E+04 0 0 10042 10042 3  1
0.47468358499E+01  0.15068796356E-01  0.47469000000E-03   0
...
</init>
<event>
 12   0  0.4746900E-03  0.2312331E+03  0.7957747E-01  0.1132798E+00
 21   -1    0    0  501  502  0.00000000000E+00  0.00000000000E+00  0.74064204368E+02   0.74064204368E+02  0.00000000000E+00 0.  1.
 21   -1    0    0  502  503  0.00000000000E+00  0.00000000000E+00 -0.74552086368E+03  0.74552086368E+03  0.00000000000E+00 0.  1.
 -6    2    1    2    0  503  0.14952840473E+03 -0.23999735524E+02 -0.41424800778E+03  0.47441561784E+03  0.17473990778E+03 0.  0.
-24    2    3    3    0    0  0.56722398399E+02 -0.36860071438E+02 -0.33540004381E+03  0.35186997544E+03  0.82116958530E+02 0.  0.
  6    2    1    2  501    0 -0.14952840473E+03  0.23999735524E+02 -0.25720865153E+03  0.34516945021E+03  0.17335203433E+03 0.  0.
 24    2    5    5    0    0 -0.16699616992E+03  0.38357854935E+02 -0.25987491067E+03  0.32192128147E+03  0.82093218139E+02 0.  0.
-13    1    6    6    0    0 -0.76026472087E+02  0.53922169130E+02 -0.95737952146E+02  0.13361654188E+03  0.00000000000E+00 0.  1.
 14    1    6    6    0    0 -0.90969697833E+02 -0.15564314195E+02 -0.16413695853E+03  0.18830473960E+03  0.00000000000E+00 0. -1.
  5    1    5    5  501    0  0.17467765185E+02 -0.14358119410E+02  0.26662591415E+01  0.23248168736E+02  0.46999998093E+01 0. -1.
 11    1    4    4    0    0  0.50813684997E+02 -0.61274565657E+02 -0.22556131392E+03  0.23919554619E+03  0.00000000000E+00 0. -1.
-12    1    4    4    0    0  0.59087134026E+01  0.24414494219E+02 -0.10983872989E+03  0.11267442925E+03  0.00000000000E+00 0.  1.
 -5    1    3    3    0  503  0.92806006335E+02  0.12860335914E+02 -0.78847963972E+02  0.12254564240E+03  0.46999998093E+01 0.  1.
</event>
<event>
...
</LesHouchesEvents>
  • Possibility to store hard-process states and reco objects in a same file.
  • The generation step (hard-process, shower, reco) will be specified by the status code.
  • Optional substructure in <event> block: defining a XML tag for each collection of objects. Several collections of a same object kind (jets in the example) can be defined and used.
<hardprocess>
...
</hardprocess>
<jets>
...
</jets>
<jets name="substructure John Hopkins algo">
...
</jets>
<electrons>
...
</electrons>
<muons>
...
</muons>
...
2013/groups/tools/eventformats.1371635647.txt.gz · Last modified: 2013/06/19 11:54 by eric.conte