GSI Forum
GSI Helmholtzzentrum für Schwerionenforschung
Home » PANDA » PandaRoot » General » Pions decays in detector
Re: Pions decays in detector [message #24419 is a reply to message #24416] Fri, 18 October 2019 12:17 Go to previous messageGo to previous message
Anna Skachkova is currently offline  Anna Skachkova
Messages: 37
Registered: September 2018
continuous participant
 From: *jinr.ru
According to PDG, the mean life time of charged pion is tau = 2.6 x 10^-8 sec, that means, the mean lenght of pion decay is c x tau = 7.8 m.
Simulation in PYTHIA shows (see muon TDR p.19 or arXiv:hep-ph/0506139v2 p.23) that the most part of decay muons are produced close to the interaction point,
while the rest are distributed over detector volume (with a mean value for the whole space close to 7.8 m). And there are about 3 muons from meson decays per 10 background events at this energy produced in detector volume, according to branching ratio of meson decays. So such a small number of final muons after PandaRoot looks pretty strange. While the initial number of pions in PYTHIA and DPM backgrounds are rather compatible, the final number of muons in fast simulation in PYTHIA and after simulation in PandaRoot are drastically differ. Is it possible to pull out the model of pion decays, contained in PandaRoot (Geant) to understand such a difference?

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: NYX phases out
Next Topic: Problem while analyzing a data with OS X which created with Linux Ubuntu based PandaRoot-dev version
Goto Forum:
  

[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Wed Apr 02 04:15:57 CEST 2025

Total time taken to generate the page: 0.00991 seconds
.:: Contact :: Home :: Legal Notice :: Data Protection Policy ::.

Powered by: FUDforum 3.1.3.
Copyright ©2001-2023 FUDforum Bulletin Board Software