[Eg6_analysis] meeting tomorrow

[hattawy]

Hello Stepan and all,

    Following our discussion yesterday about estimating the systematic 
uncertainty induced by the calculated acceptance ratio ( 
R(1gamma/2gamma) ).
    I initially estimated it from repeating the analysis using +-20% on 
the calculated R. After your suggestion of calculating this ratio 
without applying the cross section parametrization at the level of 
generating the events, i.e. flat production in the four kinematic 
variables: Q2, t, xB and phi. The results is attached.

    In the plot, the acceptance ratio as versus Q2. The blue (red) points 
are the ratio with (without) the cross section parametrization. You can 
see that the shape of the ratio is almost consistence, with uniform 
increase. I observed the same behavior for the rest of the variables, 
and the coherent channel as well. We can conclude that the initial 
method of +-20% is good enough to give us an estimation of this 
uncertainty.

    Can you please refer me to the exact precision of the Moller 
polarimeter.

Best regards,
Mohammad.






On 2015-05-27 02:16, Nathan Baltzell wrote:
> Hello Everyone,
> 
> We will have our weekly meeting tomorrow, May 27, at 10:00 in L210.
> 
> Add to the agenda:
> https://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Meeting_on_May_27,_2015_@_10:00AM
> 
> Bluejeans meeting instructions:
> 
> URL:
> https://bluejeans.com/151158041/
> 
> Dial In:
> +1 408 740 7256 or +1 888 240 2560
> then the meeting ID followed by #:
> 151158041##
> 
> -Nathan
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