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ComPWA / gluex-nstar

Investigation of N* (and K*) in GlueX photoproduction experiment
https://compwa.github.io/gluex-nstar
MIT License
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Spin alignment test with a2 #4

Open shenvitor opened 3 months ago

shenvitor commented 2 weeks ago

@redeboer Maybe this issue means later I should include the use of ampform-dpd? If so, or this is a separate issue, then maybe I should create a new issue.

redeboer commented 2 weeks ago

Yeah probably better to use ampform-dpd. But are you using two subsystems or only the subsystem that has a2?

shenvitor commented 2 weeks ago

Yeah probably better to use ampform-dpd. But are you using two subsystems or only the subsystem that has a2?

As we saw previously: only one subsystem ($\eta \pi^0$: two mesons) can have $a_2$ resonance, the other two subsystems ($\pi p$ and $\eta p$: a meson and a baryon) can't have $a_2$. So I guess the subsystem that has $a_2$?

Actually, I am wondering if we should also do this to the two subsystems with N* or Delta too later maybe? 🤔

redeboer commented 2 weeks ago

Dalitz-Plot Decomposition is only needed if there are multiple subsystems. $\Delta$ with N would be an example, but for the channel with a2 you can also include another resonance that lives in another subsystem (maybe $\Delta$ or N actually, but thought you were studying those in a different final state).