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unit of energy in Lumi monitor reconstruction [message #9101] Wed, 29 July 2009 21:59 Go to next message
donghee is currently offline  donghee
Messages: 385
Registered: January 2009
Location: Germnay
first-grade participant
From: *dip.t-dialin.net
Dear Lumi experts,

What is the unit of reconstructed energy?
Quote:


PndLumiRecoHit *MyRecoHit = (PndLumiRecoHit*) reco_array->At(k);
energy = MyRecoHit->GetRecoEnergy();


In 4 each lumi station, I see now following number in one particular beam particle (anti-proton).
Quote:


energy1 = 91531.3
energy2 = 60571
energy3 = 74528
energy4 = 94786.3


I'm wondering why they don't have similar value?


cheers!
Re: unit of energy in Lumi monitor reconstruction [message #9108 is a reply to message #9101] Thu, 30 July 2009 11:07 Go to previous message
Tsitohaina Randriamalala is currently offline  Tsitohaina Randriamalala
Messages: 14
Registered: October 2007
Location: FZ Jülich
occasional visitor
From: *ikp.kfa-juelich.de
Hi Donghee,
The unit that is used here is the eV.
The mean value of the energy deposited per hit is about 85 keV.
The values of the energy deposited at each sensor depend on how you set the threshold. A possible explanation of why you got different values of the charge is that you probably had at some hit after the digitization a multiplicity 2 or more that at one or some strips fired the charges are bellow the threshold.


Tsito
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