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Chapter 39: Problem 26

Determine the quark composition of the \(\pi^{-}.\)

Short Answer

Expert verified
The quark composition of the \(\pi^{-}\) is an antidown quark \(\bar{d}\) and an up quark \(\bar{u}\).

Step by step solution

01

Understand the pion particle

Pions (\(\pi\)) are a type of meson. Hence, they are composed of a quark and an antiquark. It is important to note that they come in three forms, namely, \(\pi^{+}\), \(\pi^{0}\), and \(\pi^{-}\), each with a different quark composition.
02

Identify the quark composition for \(\pi^{-}\)

Once we know pions are composed of a quark and antiquark, we need to specify the composition for a \(\pi^{-}\). For the \(\pi^{-}\), its composition is formed by an antidown quark \(\bar{d}\) and an up quark \(\bar{u}\).

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Most popular questions from this chapter

Classify (a) mesons and (b) baryons as fermions or bosons, and relate your classification to the particles' quark compositions.

Both the neutral kaon and the neutral \(\rho\) meson can decay to a pion- antipion pair. Which of these decays is mediated by the weak force? How can you tell?

Your roommate is writing a science-fiction novel set very far in the future, 60 Gy after the Big Bang. One of the characters is a cosmologist, and your roommate wants to know what the cosmologist will measure for the Hubble constant. What's your answer, assuming a steady expansion rate?

A so-called muonic atom is a hydrogen atom with the electron replaced by a muon; the muon's mass is 207 times the electron's. Find (a) the size and (b) the ground-state energy of a muonic atom.

Why are we unlikely to observe an isolated quark?
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