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Chapter 33: Q21CQ (page 1211)

An antibaryon has three antiquarks with colors\[{\rm{\bar R\bar G\bar B}}\]. What is its color?

Short Answer

Expert verified

The color of an antibaryon which has three antiquarks with colors \[\overline R \,\overline G \,\overline B \] is white.

Step by step solution

01

Concept

\[\overline R \,\overline G \,\overline B \]are known as secondary visible colors, and when a color combines with an anti-color or when these three color combine, they produce white color that cannot be distinguished.

02

Find the color of an antibaryon

\[\overline {\rm{R}} {\rm{ = }}\]cyan = white - red

\[\overline {\rm{G}} {\rm{ = }}\]magenta = white - green

\[\overline {\rm{B}} \]= yellow = white - blue

\[\overline {\rm{R}} {\rm{ + }}\overline {\rm{G}} {\rm{ + }}\overline {\rm{B}} {\rm{ = }}\]white - red + white - green + white - blue

= White

Therefore, it is white.

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Most popular questions from this chapter

The primary decay mode for the negative pion \({\pi ^{\rm{ - }}} \to {{\rm{\mu }}^{\rm{ - }}}{\rm{ + }}{{\rm{\bar \upsilon }}_{\rm{\mu }}}\).

(a) What is the energy release in \({\rm{MeV}}\) in this decay?

(b) Using conservation of momentum, how much energy does each of the decay products receive, given the \({\pi ^{\rm{ - }}}\) is at rest when it decays? You may assume the muon antineutrino is massless and has momentum \(p = \frac{{{E_\nu }}}{c}\), just like a photon.

(a) What particle has the quark composition \({\rm{\bar u \bar u \bar d}}\)?

(b) What should its decay mode be?

(a) Verify from its quark composition that the \({\rm{\Delta + }}\)particle could be an excited state of the proton.

(b) There is a spread of about \({\rm{100 MeV}}\) in the decay energy of the \({\rm{\Delta + }}\), interpreted as uncertainty due to its short lifetime. What is its approximate lifetime?

(c) Does its decay proceed via the strong or weak force?

The quarks in a particle are confined, meaning individual quarks cannot be directly observed. Are gluons confined as well? Explain

Discuss how we know that \[{\rm{\pi }}\]-mesons\[\left( {{{\rm{\pi }}^{\rm{ + }}}{\rm{,\pi ,}}{{\rm{\pi }}^{\rm{0}}}} \right)\]) are not fundamental particles and are not the basic carriers of the strong force.
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