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Likelihood in PndMvdAdvancedPid Algorithm [message #10483] Wed, 31 March 2010 10:21 Go to next message
donghee is currently offline  donghee
Messages: 385
Registered: January 2009
Location: Germnay
first-grade participant
From: *dip.t-dialin.net
Hi MVD family!

I have a question about PndMvdAdvancedPidAlgo::CalcLikelihood

Is there some limitation to calculate likelihood with certain hypothesis. I found that upto 2.4 GeV some values of likelihoods can be found, but over 4 GeV all values are 0.2. Is there some reason? what is the meaning of 0.2, is it default value?



Thanks,
Donghee

Re: Likelihood in PndMvdAdvancedPid Algorithm [message #10485 is a reply to message #10483] Wed, 31 March 2010 11:16 Go to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: 130.192.155*
Well,
MVD dE/dx works only at low momenta, belox 800 MeV/c. With higher momentum values all the likelihood should be set to the same value (0.2 * 5 = 1), because all the particle hyp are equivalent.
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