(a) What particle has the quark composition \bar{\textrm{u}}\bar{\textrm{u}}\bar{\textrm{d}}? (b) What should its decay mode be?
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Final Answer
  1. antiproton
  2. pˉπ0+e\bar{\textrm{p}} \to \pi^0 + e^-

Solution video

OpenStax College Physics for AP® Courses, Chapter 33, Problem 41 (Problems & Exercises)

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Video Transcript
This is College Physics Answers with Shaun Dychko. The proton has a core composition of up, up and down and this particular particle has a core composition of anti-up, anti-up and anti-down. So it's the anti-matter counterpart of every single quark in the proton which means it's the anti-particle of this and so it is an anti-proton. And the decay mode that it will have the proton we know has a decay going into a neutral pion and a positron and so the anti-proton will decay into the anti-matter counterparts of each of these particles. Now the neutral pion is its own anti-particle and so we just repeat neutral pion here whereas the positron has an anti-particle of the electron. So the anti-proton will decay into a neutral pion and an electron.