[Halld-physics] [EXTERNAL] polarization orientations

[Justin Stevens]

Hi All,

My 2 cents: PARA and PERP is really only a useful nomenclature for beam asymmetry measurements to define our asymmetry measurement technique and to be consistent with the notation used in previous measurements at other experiments (and included in their papers e.g. https://journals.aps.org/prc/pdf/10.1103/PhysRevC.88.065203).  For most of our ongoing and future analyses of SDMEs, amplitude analyses, etc. the polarization angle is the relevant quantity and PARA/PERP are unnecessary.  

So I would suggest we continue using this PARA and PERP nomenclature in our beam asymmetry publications if the paper's authors deem it useful in describing the results.  And it will likely naturally fade away as we move beyond beam asymmetries.

-Justin

> On Nov 22, 2019, at 6:34 AM, Michael Dugger <dugger at jlab.org> wrote:
> 
> Hi,
> 
> In my previous email I should have used the new orientations.
> 
> Where I wrote 135 degree I should have used -45 degree instead.
> 
> Take care,
> Michael
> 
>> Hi,
>> 
>> I am with Mark. The PARA and PERP orientations are from the past, where
>> PARA was parallel to the floor and PERP was perpendicular to the floor.
>> Internally it hardly matters, but to the outside world the PERP and PARA
>> designations used with 45/135 degree orientations will probably be
>> confusing. We just need the angles 0, 45, 90, 135.
>> 
>> Once the orientation is given in degree, the PARA and PERP designations
>> are superfluous.
>> 
>> Take care,
>> Michael
>> 
>>> I have never liked the PARA and PERP designations appearing in
>>> communications outside the Collaboration. It is jargon IMHO. PARA to
>>> what? PERP to what? Why ALL CAPS? Why not PARALLEL and PENDICULAR?
>>> 
>>> I think 0/90 and -45/45 tell the whole story in a way that is
>>> jargon-free or nearly so.
>>> 
>>> On 11/21/19 8:07 PM, Curtis A Meyer wrote:
>>>> Hi Everyone -
>>>> 
>>>>    in regard to the referring to the polarization as -45/+45, Will has
>>>> provided the attached plot that may be useful
>>>> 
>>>> Curtis
>>>> 
>>>> 
>>>> 
>>>> 
>>>> Curtis A. Meyer|MCS Associate Dean for Research
>>>> The Otto Stern Professor of Physics cmeyer at cmu.edu
>>>> <mailto:cmeyer at cmu.edu>|412 268 2745
>>>> Carnegie Mellon University
>>>> Department of Physics, Wean Hall 8414
>>>> 5000 Forbes Ave., Pittsburgh PA, 15213
>>>> www.curtismeyer.com
>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.curtismeyer.com&d=DwMFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=p3b5acpwYNkmZ3alLqoe1DpcHi6vq5JvK_7ohJe1WqI&m=uoF2pX6Pqr0jXdX1Yj_zBCYx0Mlfo07-z6Ku8BBVZX8&s=JTIqK28pmrasWN8txNY6iK7aAvgjPibsz134yzdySNY&e=>
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
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