[Eg6_analysis] meeting tomorrow

[Nathan Baltzell]

Hi Mohammad,

I think you said it, but just to be sure:
This systematic difference of R from two different models is also constant in dvcs-phi?

-Nathan



On May 28, 2015, at 12:52 PM, hattawy <hattawy at ipno.in2p3.fr> wrote:

> 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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