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Smarter simplification and lambdification #44

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mmikhasenko opened this issue Feb 13, 2023 · 0 comments
Open

Smarter simplification and lambdification #44

mmikhasenko opened this issue Feb 13, 2023 · 0 comments
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@mmikhasenko
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mmikhasenko commented Feb 13, 2023

Played with the repository today, want to drop feedback here.

My goal was to get the unpolarized intensity as a function of the Mandelstam invariant variables, $\mathcal{I}(\sigma_1,\sigma_2)$.
Once you put all expressions together, BWs, angles, and couplings under the spin some $|\mathcal{M}|^2$, it take forever to doit + simplify.
I waited an hour and it did not finish, even with 2 isobars. So, likely one needs to be smart for the simplification step.
Something along this lines

  1. start with parametric expressions for BW
  2. simplify angular dependence, getting a bilinear form on H_prod BW H_decay
  3. substitute the angles
  4. substitute BWs
  5. simplify
  6. compile

See also ComPWA/report#7

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