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Lesson: The Conservation of Baryon Number

In this lesson, we will learn how to determine the baryon number of composite particles and sets of particles and whether given interactions conserve baryon number.

Worksheet • 14 Questions

Q1:

What is the baryon number of a charm antiquark?

  • A βˆ’ 1 3
  • B0
  • C+1
  • D βˆ’ 1
  • E + 1 3

Q2:

What is the baryon number of a proton?

Q3:

A tetraquark is a hypothetical particle that is made up of four quarks. If a tetraquark had the composition 𝑐 Μ„ 𝑐 𝑑 Μ„ 𝑒 , what would its baryon number be?

Q4:

Which of the following particles have a baryon number of βˆ’ 1 ?

  • down quark
  • down antiquark
  • antielectron
  • tauon
  • tau neutrino
  • tau antineutrino
  • antiproton
  • neutron
  • photon
  • AAntiproton
  • BAntielectron and neutron
  • CPhoton, neutron, and tau antineutrino
  • DTau neutrino and down quark
  • ETauon and down antiquark

Q5:

Which of the following particles have a baryon number of 1?

  • electron
  • neutron
  • top quark
  • D meson
  • delta baryon
  • electron neutrino
  • proton
  • B meson
  • charm quark
  • AProton, neutron, and delta baryon
  • BTop quark, B meson and D meson
  • CNeutron, top quark, and D meson
  • DProton, B meson, and charm quark
  • EElectron neutrino and charm quark

Q6:

What is the baryon number of an electron neutrino?

Q7:

What is the baryon number of a top quark?

  • A + 1 3
  • B0
  • C βˆ’ 1 3
  • D βˆ’ 2 3
  • E + 2 3

Q8:

Which of the following particle interactions does not conserve baryon number?

  1. Ξ£ πœ‹ + + 0 p +
  2. Ξ£ πœ† 𝛾 0 0 +
  3. p + p + + + – + – 0 πœ‹ πœ‹ πœ‹
  4. p + + + – 0 0 πœ‹ Κ πœ†
  5. πœ‹ πœ‡ 𝜈 – – + οŽ€
  6. Ξ” πœ‹ 0 0 n +
  • Av
  • Bi
  • Cii and iv
  • Dvi
  • Eiii and v

Q9:

A πœ‹  is a meson that is made up of an up quark and a down antiquark. What is the baryon number of a πœ‹  ?

Q10:

Which of the following particles have a baryon number of + 1 3 ?

  • pion
  • down quark
  • photon
  • up antiquark
  • proton
  • neutron
  • strange antiquark
  • bottom quark
  • electron
  • ADown quark and bottom quark
  • BUp antiquark and proton
  • CElectron and neutron
  • DStrange antiquark and electron
  • EPion and photon

Q11:

Which of the following particles have a baryon number of 0?

  • proton
  • top quark
  • electron
  • B meson
  • down antiquark
  • tauon
  • mu neutrino
  • delta baryon
  • up quark
  • AB meson, electron, mu neutrino, and tauon
  • BTop quark, electron, mu neutrino, and tauon
  • CDown antiquark, delta baryon, and up quark
  • DUp quark, delta baryon, and B meson
  • ETauon, mu neutrino, and top quark

Q12:

What is the baryon number of a muon?

Q13:

Which of the following particles have a baryon number of βˆ’ 1 3 ?

  • tauon
  • down antiquark
  • kaon
  • strange quark
  • up antiquark
  • muon
  • photon
  • tau neutrino
  • top antiquark
  • ADown antiquark, up antiquark, and top antiquark
  • BStrange quark and top antiquark
  • CTau neutrino, photon, and kaon
  • DKaon, photon, and up antiquark
  • EMuon, tauon, and strange quark

Q14:

A Xi baryon is a particle that is made up of one up quark and two strange quarks. What is the baryon number of a Xi baryon?
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