[G8b_run] FROST meeting

[Ken Livingston]

Hi Barry,
Thanks for taking time to have a look at that. I agree that, in general,
the moment method is a better approach than fitting phi distributions,
since it uses more information, by taking actual phi values instead of
binning an phi and fitting. I believe the likelihood method being
developed here by Dave Ireland is even better - I ask Dave about this
yesterday, specifically whether a "null" approach (if the algebra it is
correct) could work using the likelihood technique, where the beam
polarization is plugged in event by event.

A I understang it, both the moment and likelihood methods require an
external determination of the flux ratio - eg. from fitting a cos 2ph
distribution. I'm not familiar enough with the moment technique to say,
but it seems to me that it would probably also deliver ratios but not
absolute values (like P1).

Cheers,
Ken


On 06/29/2011 09:22 PM, Barry Ritchie wrote:
>
> Ken, in principle, I would think naively that the Fourier moment
> approach would be a very nice way to get the values of the variables
> in the ratio N1(phi)/N2(phi). I haven’t worked out the isolation of
> the variables, but I would think that approach should allow you to use
> all the phi data simultaneously to get the P1 in the denominator and
> then the others in the numerator. Did you look at that?
>
> ---BGR
>
>
> *Professor Barry G. Ritchie
> Department of Physics
> Arizona State University
> Tempe, AZ**　**85287-1504
> *
> *Telephone: (480) 965-4707
> Fax: (480) 965-7954
>
> *
>
> *From:*g8b_run-bounces at jlab.org [mailto:g8b_run-bounces at jlab.org] *On
> Behalf Of *Ken Livingston
> *Sent:* Wednesday, June 29, 2011 1:32 PM
> *To:* g8b_run at jlab.org
> *Subject:* Re: [G8b_run] FROST meeting
>
> Hi All,
> I've added this link http://nuclear.gla.ac.uk/~kl/g9/G.html
> <http://nuclear.gla.ac.uk/%7Ekl/g9/G.html> to those other in the
> meeting page. It's an outline of a method for measuring G - making
> best use of all available information. I also believe this method
> avoids the need to know the photon beam polarization.
> If anyone has time to have a look before the meeting that would be
> useful. I could give a summary if required.
>
> Regards,
> Ken
>
> On 06/29/2011 08:19 PM, Eugene Pasyuk wrote:
>
> Hi all,
>
> We will have our weekly meeting tomorrow Thursday Jun 30 at 11:30 JLab
> time in B101.
> http://clasweb.jlab.org/rungroups/g9/wiki/index.php/June_30%2C_2011
>
> The g9 meeting will possibly be followed by g8b beam polarization
> discussion.
>
> -Eugene
>
>
>
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