BEHAVIOR: use single square root in PhaseSpaceFactor#484
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* FEAT: define `BreakupMomentumSplitSqrt` and `BreakupMomentumKallen` * MAINT: standardize docstring extension of phasespace factor protocols
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* FIX: always restore `output-files` cache
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Explain motivation for this. What is the message for the user? What sqrt is now better to use? Do we even care about 'less complex' cut structure below 1st threshold when this should be solved by using Chew Mandelstam anyway?
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Closes #483
Tip
Preview of the page about analytic continuation here.
The phase space factor and break-up momentum with a "split" square root have a cleaner cut structure, but have worse numerical performance. This PR therefore reverts #479 and offers the alternative functions
PhaseSpaceFactorKallenandPhaseSpaceFactorSplitSqrt.