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eta_c drop in efficiency [message #12731]

Wed, 19 October 2011 18:02

Gianluigi Boca
Messages: 177
Registered: March 2004

first-grade participant

From: *gsi.de

hello,
I investigated the discrepancy in efficiency in the Eta_c channel
when using the july11 release or the latest trunk version.
( pandaroot/macro/run/tdrct/eta_c directory).

In my opinion the problem is in the generation/digitization of the
Eta_c events.

In fact, when I use the events generated and digitized (i.e. the
evt_points_stt.root and evt_params_stt.root and evt_digi_stt.root files) with the july11 libraries AND I ANALYSE THEM WITH THE
CURRENT TRUNK REVISION I obtain the same Eta_c plots obtained
when I ANALYSE THE SAME EVENTS WITH THE july11 VERSION OF THE CODE.

Please look at the attachment plots : trunk.pdf is when
the analysis is done with trunk, july11.pdf when I use the
july11 library.

Gianluigi

Attachment: trunk.pdf
(Size: 17.48KB, Downloaded 518 times)
Attachment: july11.pdf
(Size: 17.58KB, Downloaded 458 times)

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Re: eta_c drop in efficiency [message #12735 is a reply to message #12731]

Wed, 19 October 2011 22:22

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

first-grade participant

From: *play-internet.pl

Hi Gianluigi,

From the plots you posted, actually I see that the number of counts in eta_c peak for trunk is 2 times lower than for july11. Number of entries in histograms are almost the same but it's not an indicative number since it includes underflow/overflow.

Dima

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Re: eta_c drop in efficiency [message #12740 is a reply to message #12735]

Thu, 20 October 2011 10:00

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Probably using the same bin range and size would be helpful to compare the plots.
And I admit I have not well understood what you have done exactly.

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