Long-lived particles

Here you can find the information on how to use the displaed vertex finding for LLP on the linux cluster

Displaced Vertex Reconstruction

Discussion forum: Mattermost town square
Overview of reconstruction algorithms: LLP reconstruction meeting

Secondary vertex reconstruction code

The recipe how to set-up the latest version of the code can be found here

Analysis code

A first version of some analysis code can be found in git. Note, the link will also give you the recipe on how to run the code. To test your code you might use the datasets, which are on the SE at RAL. There are

• mc15_13TeV:mc15_13TeV.301911.Pythia8EvtGen_A14NNPDF23LO_LLzprimemumu_m250t100.merge.DAOD_SUSY15.e4125_s2698_r8788_p2877 file list
• mc15_13TeV:mc15_13TeV.403087.PythiaRhad_AUET2BCTEQ6L1_gen_gluino_p1_2000_qq_1900_1ns.merge.DAOD_SUSY15.e5220_s2821_r8788_p2877
• mc15_13TeV:mc15_13TeV.402735.PythiaRhad_AUET2BCTEQ6L1_gen_gluino_p1_2000_qq_100_1ns.merge.DAOD_SUSY15.e4732_s2770_s2183_r8788_p2877
• mc15_13TeV.308381.Pythia8EvtGen_A14NNPDF23LO_WmuHNL50_3G_lt10dd.recon.DAOD_RPVLL.e5876_s2726_r8788 file list
• mc15_13TeV.308382.Pythia8EvtGen_A14NNPDF23LO_WmuHNL50_3G_lt100dd.recon.DAOD_RPVLL.e5876_s2726_r8788 file list
• mc15_13TeV.308320.Pythia8EvtGen_A14NNPDF23LO_WmuHNL50_15G_lt10dd.recon.DAOD_RPVLL.e5870_s2726_r8788 file list
• mc15_13TeV.308319.Pythia8EvtGen_A14NNPDF23LO_WmuHNL50_15G_lt100dd.recon.DAOD_RPVLL.e5870_s2726_r8788 file list
• mc15_13TeV:mc15_13TeV.308382.Pythia8EvtGen_A14NNPDF23LO_WmuHNL50_3G_lt100dd.recon.ESD.e5876_s2726_r7772
• mc15_13TeV:mc15_13TeV.308381.Pythia8EvtGen_A14NNPDF23LO_WmuHNL50_3G_lt10dd.recon.ESD.e5876_s2726_r7772

Other test datasets are produced privately by Hideyuke with the latest code and are in /eos/atlas/user/h/hoide/VrtSecInclusive/debug_sample/rpvll/private/. They are copied on the cluster in

• /opt/ppd/data/atlas/mwielers/llp

To run you need 3 arguments (directory with results, file path, pattern to look for) runExample default /opt/ppd/data/atlas/mwielers/llp/mc15_13TeV.403087.PythiaRhad_AUET2BCTEQ6L1_gen_gluino_p1_2000_qq_1900_1ns.merge.DAOD_SUSY15.e5220_s2821_r8788_r8535 mc15_13TeV.403087.PythiaRhad_AUET2BCTEQ6L1_gen_gluino_p1_2000_qq_1900_1ns.merge.DAOD_SUSY15.e5220_s2821_r8788_r8535_private_jo1.pool.root

HNL MC

In these samples the heavy neutrino has particle code 50. It decays into eenu, emunu (the intermediate off-shell W does not appear in the event record). To find the correct HNL in the truth recod you have to pick the ones with particle code 50 which has 3 outgoing particles as you cannot deduce this from the status.

-- Monika Wielers - 2017-08-25

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