| Pions decays in detector [message #24365] |
Wed, 09 October 2019 15:17  |
AndreiSemenov
Messages: 6
Registered: June 2019
Location: Dubna, Russia
|
occasional visitor |
From: *jinr.ru
|
|
Hello,
We want to estimate background muons which come mainly from pions (and kaon) decays. I tried an example from tutorial thailand2017 with DPM generator and I got very few muons, 10-20 muons (and ~1000 pions) per 1000 events.
It looks like pions does not decay in detector. I tried BOX generator to inject pions
or kaons, and I see (with IdealCharged algorithm) 15-20 muons and ~850 initial particles
per 1000 events. Is this normal? Or particle decays in detector should be switched on somewhere?
Kind regards,
Andrei Semenov.
[Updated on: Thu, 10 October 2019 14:07] Report message to a moderator |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Re: Pions decays in detector [message #24421 is a reply to message #24419] |
Fri, 18 October 2019 13:09  |
Radoslaw Karabowicz
Messages: 108
Registered: June 2004
Location: GSI
|
continuous participant |
From: *gsi.de
|
|
Dear Anna! Dear Andrei,
you are simulating 1 GeV/c pions. When I was studying physics, these would be called
highly relativistic pions. I _did_ the calculation for you, I haven't done this exercise in years,
so I hope I didn't do some stupid mistake.
p = 1GeV/c
m = 141MeV/c^2
tau = 2.6e-8 s
From p = gamma(v) * m * v
I get v ~= 0.98995c
and gamma(v) ~= 7
Hence the mean length of a 1GeV/c pion is:
length = gamma(v) x v x tau ~= 7 x c * tau = 7 x 7.8m ~= 50m
If you want to see more decays, LOWER the energy of the pion.
|
|
|
|
GSI Forum
Search
Help
Members
Login
Home
