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Question about GetEnergyCorrected() [message #8553]

Thu, 14 May 2009 10:24

donghee
Messages: 385
Registered: January 2009
Location: Germnay

first-grade participant

From: *dip.t-dialin.net

Dear EMC experts,

I have a question for the function of GetEnergyCorrected().

A function is introduced to estimate the corrected energy of cluster in PndEmcCluster::GetEnergyCorrected() function.

Where comes from this internal calibration and how much differ from uncorrected one?
I have also checked my event with photon candidate.
The shape is slightly changed, but not so much.
Could you explain, what is the motivation for this correction and why do we need?

Thank you in advance,
Donghee Kang

[Updated on: Thu, 14 May 2009 10:25]

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Re: Question about GetEnergyCorrected() [message #8555 is a reply to message #8553]

Thu, 14 May 2009 11:22

Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...

first-grade participant

From: *fuw.edu.pl

Hi Donghee,

This correction takes into account energy losses due to leakage and energy thresholds for single crystal - 3 MeV.

It is roughly 3 %, but is dependent on energy and theta angle.

The correction implemented in GetEnergyCorrected() function is ported from the old framework and should be redone in pandaroot (since different version of Geant4 are used) but it still roughly do the job.

And in principle it should be latter replaced by the calibration for example on pi0 or eta mass, but this part of software is still missing.

Best regards,
Dima

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Re: Question about GetEnergyCorrected() [message #8556 is a reply to message #8553]

Thu, 14 May 2009 11:28

donghee
Messages: 385
Registered: January 2009
Location: Germnay

first-grade participant

From: *dip.t-dialin.net

Dear Dima,

Thank you for your answer.

Best wishes,
Donghee Kang

[Updated on: Thu, 14 May 2009 11:28]

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Re: Question about GetEnergyCorrected() [message #8558 is a reply to message #8555]

Thu, 14 May 2009 11:39

Bertram Kopf
Messages: 110
Registered: March 2006

continuous participant

From: *ep1.ruhr-uni-bochum.de

Dear Donghee,

you can also find a description of the photon reconstruction (incl. reconstruction thresholds and leakage corrections) in the Physics Book: sec. 3.3.2 Photon Reconstruction and sec. 3.3.2.3 Leakage Corrections

Cheers,
Bertram.

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