ComPWA / expertsystem

Rule based particle reaction problem solver on a quantum number level
http://expertsystem.rtfd.io
1 stars 3 forks source link

Parity violation in weak decays is not considered in coupling of amplitudes #419

Closed sebastianJaeger closed 3 years ago

sebastianJaeger commented 3 years ago

When generating an Amplitude Model for the decay Lambda_c^+ -> proton K- pi+, the magnitudes and phases of weak decays are automatically coupled due to parity, although parity violation in weak decays means that they should be independent of each other.

For example in the subdecay Lambda_c^+ -> proton K*(892), the parameter

"Magnitude_Lambda(c)+_to_K*(892)0_1+p_0.5;K*(892)0_to_K-_0+pi+_0"

gets used in both the

"Lambda(c)+_-0.5_to_K*(892)0_-1+p_-0.5;K*(892)0_-1_to_K-_0+pi+_0"

and the

"Lambda(c)+_-0.5_to_K*(892)0_1+p_0.5;K*(892)0_1_to_K-_0+pi+_0"

amplitude, though these should be independend of each other.

spflueger commented 3 years ago

@sebastianJaeger Thanks for the bug report! A tip for the report itself: You can selected the type of issue in the Labels section on the right -> Bug (instead of putting it into the title)

redeboer commented 3 years ago

instead of putting it into the title

That tag in the title is set by the issue template https://github.com/ComPWA/expertsystem/blob/0.6.5/.github/ISSUE_TEMPLATE/bug_report.md

redeboer commented 3 years ago

When generating an Amplitude Model for the decay Lambda_c^+ -> proton K- pi+, the magnitudes and phases of weak decays are automatically coupled due to parity, although parity violation in weak decays means that they should be independent of each other.

For example in the subdecay Lambda_c^+ -> proton K*(892), the parameter

"Magnitude_Lambda(c)+_to_K*(892)0_1+p_0.5;K*(892)0_to_K-_0+pi+_0"

gets used in both the

"Lambda(c)+_-0.5_to_K*(892)0_-1+p_-0.5;K*(892)0_-1_to_K-_0+pi+_0"

and the

"Lambda(c)+_-0.5_to_K*(892)0_1+p_0.5;K*(892)0_1_to_K-_0+pi+_0"

amplitude, though these should be independend of each other.

So just for my understanding, what should be the names in this case?