Home » PANDA » PandaRoot » Analysis » Efficiency reduction of antiprotons above 20 degrees
| Re: Efficiency reduction of antiprotons above 20 degrees [message #17603 is a reply to message #17583] |
Tue, 02 December 2014 13:25   |
Karin Schönning
Messages: 65
Registered: August 2012
Location: Uppsala University
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continuous participant |
From: *physics.uu.se
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Hi again,
I ran the box generator at 1 GeV and 2 GeV, from 0 to 0 degrees in the lab angle, and at 2 GeV I first put the generator in the interaction point and then 20 cm away (in z) from the IP. One can not see any clear differences in structures, but there is a significant difference in the efficiency of protons with respect to antiprotons:
1 GeV, at IP: protons 89%, antiprotons 80%
2 GeV, at IP: protons 91%, antiprotons 82%
2 GeV, at (x,y,z) = (0,0,20): protons 69%, antiprotons 64%
In the attachment you can see the distributions theta vs p. Hopefully the file names ar self-explanatory.
It is difficult to draw any conclusions from this except that there is indeed a difference between the proton and the antiproton efficiency. Here, it however looks like it is an overall effect.
I will shortly post some more plots from Lambda Lambdabar simulations because they tell a somewhat different story.
Cheers,
/Karin
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