[G12] BEC Update

[Saini, Mukesh]

Hi,

I could not follow what was going on today much. Hopefully g12 folks at Jlab came to a common resolution for the beam energy corrections (BEC). I have been fiddling around with it and I have BEC that I obtain from only the high end of the Tagger (4 GeV and up where it seems to be a single number).

If I include the low end to calculate the corrections it overwhelms the data and even though it fixes the majority of the data (which is at low end for the channel I use for BEC), the corrections are much higher in magnitude (30-40 MeV) which also make them unreasonable and makes the higher mass where I am interested not any better.

These corrections, taken only from high end of the Tagger, are at most ~13 MeV.

Effect on my data is shown: Its about 0.7 MeV improvement in resolution - So its not much. My motivation to do this is to have a setup while I wait for g12 BEC and momentum corrections and also to show that BEC is a factor in the missing mass resolution as expected.

I am sending this out in case anyone still wants to use this and see if it helps with their resolution issues while they wait for the correct ones. The number for corrections are in BEC4.h and the way I use them is described in the HowTo.

Mukesh.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: BEC_HowTO.pdf
Type: application/pdf
Size: 48343 bytes
Desc: BEC_HowTO.pdf
Url : https://mailman.jlab.org/pipermail/g12/attachments/20120306/ca1687a4/attachment-0001.pdf 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: BEC4.h
Type: text/x-chdr
Size: 26690 bytes
Desc: BEC4.h
Url : https://mailman.jlab.org/pipermail/g12/attachments/20120306/ca1687a4/attachment-0001.bin 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: BEC_With_Eloss.png
Type: image/png
Size: 42350 bytes
Desc: BEC_With_Eloss.png
Url : https://mailman.jlab.org/pipermail/g12/attachments/20120306/ca1687a4/attachment-0002.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: With_Eloss.png
Type: image/png
Size: 42133 bytes
Desc: With_Eloss.png
Url : https://mailman.jlab.org/pipermail/g12/attachments/20120306/ca1687a4/attachment-0003.png