Worksheet: The Conservation of Baryon Number

In this worksheet, we will practice determining the baryon number of composite particles and sets of particles and whether given interactions conserve baryon number.

Q1:

What is the baryon number of a charm antiquark?

  • A 1 3
  • B0
  • C 1
  • D+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 𝑐̄𝑐𝑑̄𝑢, what would its baryon number be?

Q4:

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

  • down quark
  • down antiquark
  • antielectron
  • tauon
  • tau neutrino
  • tau antineutrino
  • antiproton
  • neutron
  • photon
  • ATau neutrino and down quark
  • BAntielectron and neutron
  • CTauon and down antiquark
  • DAntiproton
  • EPhoton, neutron, and tau antineutrino

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
  • ANeutron, top quark, and D meson
  • BProton, neutron, and delta baryon
  • CProton, B meson, and charm quark
  • DTop quark, B meson and D meson
  • 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 + 2 3
  • B + 1 3
  • C 1 3
  • D0
  • E 2 3

Q8:

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

  1. Σ 𝜋 + + 0 p +
  2. Σ 𝜆 𝛾 0 0 +
  3. p + p + + + + 0 𝜋 𝜋 𝜋
  4. p + + + 0 0 𝜋 Κ 𝜆
  5. 𝜋 𝜇 𝜈 +
  6. Δ 𝜋 0 0 n +
  • Avi
  • Bv
  • Ci
  • Dii and iv
  • Eiii and v

Q9:

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

Q10:

Which of the following particles have a baryon number of +13?

  • pion
  • down quark
  • photon
  • up antiquark
  • proton
  • neutron
  • strange antiquark
  • bottom quark
  • electron
  • AStrange antiquark and electron
  • BDown quark and bottom quark
  • CPion and photon
  • DUp antiquark and proton
  • EElectron and neutron

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 13?

  • tauon
  • down antiquark
  • kaon
  • strange quark
  • up antiquark
  • muon
  • photon
  • tau neutrino
  • top antiquark
  • ADown antiquark, up antiquark, and top antiquark
  • BTau neutrino, photon, and kaon
  • CKaon, photon, and up antiquark
  • DMuon, tauon, and strange quark
  • EStrange quark and top antiquark

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?

Q15:

The following equation shows a proton and an antiproton annihilating to produce a gamma-ray photon, p+p̄𝛾.

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q16:

The following equation shows a sigma baryon decaying into a lambda baryon and a pion, ΣΛ𝜋.+

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q17:

The following equation shows a particle interaction that would not conserve baryon number, 𝛾𝜋.p+

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q18:

The following equation shows a lambda baryon decaying into a proton and a pion. Λ𝑝𝜋+

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

Q19:

The following equation shows a particle interaction that would not conserve baryon number. Λ𝜋𝜋+

What is the total baryon number before this interaction takes place?

What is the total baryon number after this interaction takes place?

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