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correction in emc bump splitting [message #7669]

Tue, 13 January 2009 04:10

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

first-grade participant

From: 94.254.162*

Hi all,

I have corrected the small bug in emc code which affected bump splitting and particularly calculation of the bump position. (rev.4314)

The energy of the bumps was calculated properly but to suppress merged pi0, we need not only energies of the bumps but also opening angle of pi0. And the bug in the calculation of bump position resulted in wrong opening angle and as a result in low efficiency of the merged pi0 suppression.

The pictures below gives some demonstration of the bump splitting for 200 event, 5 GeV pi0 generated in [30;60] degree theta range.

The following picture presents the MC Truth energy of gamma's from pi0 decay and reconstructed energy of EmcClusters.

index.php?t=getfile&id=4903&private=0

The same for EmcBumps
index.php?t=getfile&id=4904&private=0

i.e. the energy distribution is reproduced.

The opening angle of pi0 for MC Truth and EmcClusters
index.php?t=getfile&id=4905&private=0

And reconstructed opening angle for EmcBumps
index.php?t=getfile&id=4906&private=0

And finally pi0 invariant mass for EmcClusters
index.php?t=getfile&id=4907&private=0

and EmcBumps
index.php?t=getfile&id=4908&private=0

i.e. without bump splitting only 10 % of pi0 are reconstructed.

All the pictures are plotted with bump_analysis.C macro.

Best regards,
Dima

Attachment: egamma_cluster.png
(Size: 12.29KB, Downloaded 1623 times)
Attachment: egamma_bump.png
(Size: 12.78KB, Downloaded 1613 times)
Attachment: pi0_angle_cluster.png
(Size: 14.55KB, Downloaded 1615 times)
Attachment: pi0_angle_bump.png
(Size: 14.19KB, Downloaded 1538 times)
Attachment: m_pi0_cluster.png
(Size: 12.41KB, Downloaded 1649 times)
Attachment: m_pi0_bump.png
(Size: 12.14KB, Downloaded 1619 times)

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[Message index]

		correction in emc bump splitting By: Dima Melnychuk on Tue, 13 January 2009 04:10
		Re: correction in emc bump splitting By: Bertram Kopf on Tue, 13 January 2009 15:54
		Re: correction in emc bump splitting By: Johan Messchendorp on Tue, 13 January 2009 23:16
		Re: correction in emc bump splitting By: Irina Brodski on Fri, 06 February 2009 12:58
		Re: correction in emc bump splitting By: Dima Melnychuk on Fri, 06 February 2009 13:46
		Re: correction in emc bump splitting By: Bertram Kopf on Fri, 06 February 2009 15:05
		Re: correction in emc bump splitting By: Irina Brodski on Fri, 13 February 2009 22:33
		Re: correction in emc bump splitting By: Johan Messchendorp on Thu, 19 February 2009 21:48

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