sPHENIX cold QCD topical group

[Devon Loomis <dloom AT umich.edu>]

Hi Ralf,

There is no real reason to take the absolute value of the raw asymmetry or even to define the free phase as \phi + \pi, I just did this to be consistent with the STAR local polarimeter results. I agree with you that maybe it is actually more beneficial to display the negative asymmetry as is. On this same note, I have just realized that the azimuthal angle convention here is actually flipped from the PHENIX published results so I will make this change as well to be more consistent.

Thanks,

Devon

On Mon, Jun 3, 2024 at 3:45 AM Ralf Seidl <rseidl AT rcf.rhic.bnl.gov> wrote:

Hi Devon,

the plots look good but we will certainly still get comments when
releasing them. One question I have is why you chose to have the
absolute value on the raw asymmetry? Is there an ambiguity of the sign
of it? We know the neutron AN is negative in the forward region, so that
means a right-left asymmetry relative to the polarized beam direction.
If you prefer to leave that open for now, that is also ok, I just was
wondering.

Cheers,

Ralf



On 2024-06-03 15:59, Devon Loomis via sPHENIX-cold-QCD-l wrote:
> Hi all,
>
> I am planning on including the attached plots of neutron asymmetries
> and SMD hitmaps in our local polarimetry internal note. Please let me
> know if you have any questions or comments.
>
> Thank you,
> Devon
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