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A comment on The plot thickens for a hypothetical “X17” particle. Parent comment

Re:The plot thickens for a hypothetical “X17” particle by knzhou on Friday November 29, 2019 @08:42PM (#21667960)
It's a literal angle, like you learned in geometry class. After the decay, two particles fly off in different directions. They mean the angle between those directions.
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Re:The plot thickens for a hypothetical “X17” particle by dmix on Friday November 29, 2019 @09:35PM (#21668162)
Apologies I meant what the significance of the particles bouncing off at certain angles, particularly down to the degree as others have mentioned the different ranges reported. My short google search earlier didn't help me much. Others have provided some links I will dig into.
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Re:The plot thickens for a hypothetical “X17” particle by at_a_remove on Friday November 29, 2019 @09:55PM (#21668235)
You can use the angle (in conjunction with trig applied to various conservation principles such as conservation of momentum) in an attempt to derive quantities like mass.
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