[Sane-analysis] Minutes of Jan 27 2010 Meeting

[anusha at jlab.org]

Hi All,
 I want to do a little correction from the yesterday 'Sane - analysis
minutes'
from the below paragraph,

 _*Anusha:*_ Worked on elastic calibration for BigCal. Looked at deltaE =
E_HMS - Eclust. Using either older calibration constants or none
(depending on whter it's ntuple variable eclust or e_clust) there was a
shift of -370MeV for deltaE. Using newer constants it becomes 250MeV.
This could possibly due to those constants having been extracted with
neural network, which is not yet implemented into CVS for the Analyzer.

Using newer constants it becomes 202MeV. not 250MeV

and also, sorry for not putting the link to the Meeting Agendas..
here is the link for the plots i showed at the meeting and i included it
to the yesterday meeting agenda.

https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Ep_Elastics

Thanks
Anusha




> _*James:*_ Worked on polarization analysis. IN ratios of offline/online
> polarization there were some drops, possibly from drift in magnetic
> field. Looked at chi-square of NMR poly-fit.
> https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Polarization_Drop_in_Offline_Analysis
>
> Working on improving this fit by possibly using quadratic with a
> Lorenztian. Oscar mentioned that such a fitting scheme was used for RSS
> http://twist.phys.virginia.edu/~or/target/BOT_H_TE.EPS
>
>
> _*Whit:*_ Looked at raw ADC data for Cherenkov to investigate missing
> ADC hits. Mentioned that this could be from cross-talk resulting from
> threshold settings. Mark mentioned that Cherenkov ADC (cer_adc) usually
> displays a peak around 0 with a long tail that is noticeable at log
> scale.
> https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Gas_Cherenkov_Detector#Data
>
>
> _*Jon: *_Will start working on BigCal (block to block) timing
> calibration. An initial time-walk correction was implemented in the
> beginning but does not account for some subtleties such as block
> overlaps. Will contact Andrew Puckett t osee how he did this for GEPIII.
>
> Started a page on the wiki, listing the ntuple variables along with
> descriptions for them. This is on the main page, under 'Detectors and
> Software'.
>  https://hallcweb.jlab.org/experiments/sane/wiki/index.php/SANE_Raw_Ntuple_Variable_Description
>
>
> _*Anusha:*_ Worked on elastic calibration for BigCal. Looked at deltaE =
> E_HMS - Eclust. Using either older calibration constants or none
> (depending on whter it's ntuple variable eclust or e_clust) there was a
> shift of -370MeV for deltaE. Using newer constants it becomes 250MeV.
> This could possibly due to those constants having been extracted with
> neural network, which is not yet implemented into CVS for the Analyzer.
>
> I can't find the link for the plots. So if anyone does please reply to
> this e-mail with it.
>
>
> _*Luwani:*_ Started helping with Cherenkov calibrations. After that will
> get more involved with pair-symmetric background investigation.
>
>
> _*Hovhannes:*_ Finalizing BigCal Energy calibrations. Has over half of
> the data set done and will finish soon. Will focus on the parallel
> portion of the data for the immediate future.
>
>
> _*Narbe:*_ Altered SANE GEANT(3) to use Peter's latest cross-section
> model (F1F209) in place of MRST2001 for inelastic. Talked with Vahe
> Mamyan about getting radiative corrections for 4.7 GeV.
>
>
> There will be an emphasis on getting the parallel data more finalzed to
> get preliminary A_parallel and A_1 to compare with world data. This is
> planned to be done within the next few months.
>
> Next meeting will be Feb 3 2010 at 3:30pm
>
> _______________________________________________
> Sane-analysis mailing list
> Sane-analysis at jlab.org
> https://mailman.jlab.org/mailman/listinfo/sane-analysis