[Frost] Yuqing's presentation in 2013 APS-GFP meeting

[Michael Dugger]

Yuqing,

I figured out \beta. Slide 7 shows beta is the azimuthal angle of the 
scattering plane. I just need to understand what \phi is.

It seems to me that given W and \phi I should be able to figure out the 
invariant mass of the pi+pi- system, but can't figure out how when looking 
at the figure on slide 6. What am I missing?

Thanks for your time.

Sincerely,
Michael

On Sun, 7 Apr 2013, Michael Dugger wrote:

>
> Yuqing,
>
> I am having difficulty understanding the angles.
>
> On slide 6 it looks like the azimuthal angle is that of the plane
> containing the pi+pi- pair and thetaCM is related to the proton, and
> theta is related to the pi+. Is this a correct interpretation?
>
> On slide 10 you plot in terms of \phi_{CMS}. Is this the azimuthal angle
> of the pi+pi- plane?
>
> I bet that my interpretation of the angles is all messed up :(
>
> On slide 10 the dilution factor for a fixed W is given in terms of
> \phi_{CMS}. Since the dilution factor is most sensitive to lab angles and
> momentum, I don't understand why those variables would be ignored in favor
> of a variable that should not be important for the dilution.
>
> On slide 11 you have asymmetry determination plots for fixed W and phi, in
> terms of the angle \beta. What is \beta? What particle(s) does \beta refer
> to?
>
> On slide 14 and 15 you have plots in terms of \phi. What is \phi. I am
> totally confused about the angles.
>
> Take care,
> Michael
>
>
> On Sat, 6 Apr 2013, yuqing mao wrote:
>
>> Dear folks,
>>
>> I will give a talk in the GHP meeting in Denver next week. Here is the link to my slides. This talk includes both the 'E' and Pz, Pzs, Pzc observables by the study of single- and double- pion productions, contributed by Yuqing and Steffen.
>>
>> If you have any questions or comments, please let me know.
>>
>> Thanks a lot.
>>
>> All the best,
>>
>> Yuqing
>>
>> http://www.jlab.org/Hall-B/secure/g9/yuqing/GHP.pdf
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