Which track shows ...	Click the correct answer
Decay of a negative particle.	a	b
Collision of beam particle with a proton.	a	b

No. That is NOT the right answer

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Interactions of a beam (K^-) with a proton producing two positive and two negative particles.
One of the negative particles produced at point a decays into a lighter negative particle, which is seen, and a neutral particle, which is not detected.