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Re: eta_c reconstruction efficiency [message #12724 is a reply to message #12702]

Mon, 17 October 2011 17:24

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

first-grade participant

From: *fuw.edu.pl

Hi,

Studying the problem with eta_c reconstruction efficiency I tried to look at (theta,p) distribution for the kaons that are not reconstructed with both july11, august11 release.
I generated 3000 events for both options.

Distribution for all kaons looks like:
index.php?t=getfile&id=6685&private=0

I consider kaon as not reconstructed if there is no reconstructed track MC matched to it.

For july11 release:
index.php?t=getfile&id=6686&private=0

For the trunk release:
index.php?t=getfile&id=6687&private=0

Number of entries are smaller for the second case, which should partially explain the drop in efficiency.

And since the generated events are the same the difference between two histogram:
index.php?t=getfile&id=6688&private=0

Here the kaons which were reconstructed in july11 release and are not reconstructed in trunk are green and blue. In principle they are distributed over all kinematic range with some concentration below 20 degree. And there is a number of tracks (red) which are recontructed in trunk and were not reconstructed in july11 and they a are in the lower momentum range.

May be it could be helpful somehow for Gianluigi to identify the source of the problem?

Dima

Attachment: theta_p.png
(Size: 13.96KB, Downloaded 1008 times)
Attachment: theta_p_july11.png
(Size: 14.71KB, Downloaded 995 times)
Attachment: theta_p_trunk.png
(Size: 14.63KB, Downloaded 1094 times)
Attachment: theta_p_july_trunk.png
(Size: 17.22KB, Downloaded 1014 times)

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[Message index]

		eta_c reconstruction efficiency By: Dima Melnychuk on Thu, 06 October 2011 12:01
		Re: eta_c reconstruction efficiency By: Lia Lavezzi on Fri, 07 October 2011 11:19
		Re: eta_c reconstruction efficiency By: Dima Melnychuk on Mon, 17 October 2011 17:24
		Re: eta_c reconstruction efficiency By: StefanoSpataro on Wed, 19 October 2011 18:07

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