Physics 2.1.5-7: Classification of Particles

35 flashcards · Physics · by TheoTyson

  1. Describe hadrons

    Made of quarks. Feel the strong nuclear force.

  2. Describe baryons

    Contain three quarks. Protons and neutrons.

  3. Describe antibaryons

    Contain three anti-quarks. Antiprotons and antineutrons.

  4. What is the baryon number for different types of particles? Is baryon number conserved?

    Baryons - B = + 1 Non-Baryons - B = 0 Anti-Baryons - B = -1 Baryon number is conserved in particle interactions.

  5. What is the only stable baryon?

    Proton, all other baryons decay into a proton eventually.

  6. Describe mesons

    Contain quark-antiquark pairs. Pions and kaons.

  7. What is the function of the pion?

    Exchange particle of the strong nuclear force between hadrons.

  8. What are the pion decay equations?

    π+→μ++νμ\pi^+ \rightarrow \mu^+ + \nu_\muπ+→μ++νμ​ ​ π−→μ−+νμˉ\pi^- \rightarrow \mu^- + \bar{\nu_\mu}π−→μ−+νμ​ˉ​

  9. Which particle has itself as its antiparticle?

    π0\pi^0π0

  10. Describe leptons

    Fundamental particles, cannot be split into anything else. Do not feel the strong nuclear force. Feel the weak nuclear force.

  11. What is the lepton number for different types of particles? Is lepton number conserved?

    Leptons - L = +1 Non-Leptons - L = 0 Anti-Leptons - L = -1 Lepton number is conserved in particle interactions.

  12. What are the lepton generations by increasing mass?

    e→μ→τe \rightarrow \mu \rightarrow \taue→μ→τ

  13. What do kaons decay into?

    Kaons decay into pions.

  14. What are the muon decay equations?

    μ−→e−+νeˉ+νμ\mu^- \rightarrow e^- + \bar{\nu_e} + \nu_\muμ−→e−+νe​ˉ​+νμ​ μ+→e++νe+νμˉ\mu^+ \rightarrow e^+ + \nu_e + \bar{\nu_\mu}μ+→e++νe​+νμ​ˉ​

  15. What are the quark compositions of pions?

    π+=udˉ\pi^+ = u \bar{d}π+=udˉ π0=uuˉ\pi^0 = u \bar{u}π0=uuˉ or ddˉd \bar{d}ddˉ π−=uˉd\pi^- = \bar{u} dπ−=uˉd

  16. What are the quark compositions of kaons?

    K+=usˉK^+ = u \bar{s}K+=usˉ K0=dsˉK^0 = d \bar{s}K0=dsˉ / K0ˉ=dˉs\bar{K^0} = \bar{d} sK0ˉ=dˉs K−=uˉsK^- = \bar{u} sK−=uˉs

  17. By what interaction are strange particles produced? By what interaction do strange particles decay?

    Particles that are produced in pairs by the strong interaction, but decay via the weak interaction.

  18. Is strangeness conserved?

    Strangeness is always conserved in strong interactions. Strangeness is not always conserved in weak interactions.

  19. What is the strangeness of different types of particles?

    Strange Quark - S = -1 Non-Strange Quark - S = 0 Anti-Strange Quark - S = +1

  20. What are the forms of interactions and decays?

    Interaction: A+B→C+DA + B \rightarrow C + DA+B→C+D Decay: A→B+CA \rightarrow B + CA→B+C

  21. What are the charge, baryon and strangeness of an up quark?

    Charge: 2/32/32/3 Baryon: 1/31/31/3 Strangeness: 000

  22. What are the charge, baryon and strangeness of an anti-up quark?

    Charge: −2/3-2/3−2/3 Baryon: −1/3-1/3−1/3 Strangeness: 000

  23. What are the charge, baryon and strangeness of a down quark?

    Charge: −1/3-1/3−1/3 Baryon: 1/31/31/3 Strangeness: 000

  24. What are the charge, baryon and strangeness of an anti-down quark?

    Charge: 1/31/31/3 Baryon: −1/3-1/3−1/3 Strangeness: 000

  25. What are the charge, baryon and strangeness of a strange quark?

    Charge: −1/3-1/3−1/3 Baryon: 1/31/31/3 Strangeness: −1-1−1

  26. What are the charge, baryon and strangeness of an anti-strange quark?

    Charge: 1/31/31/3 Baryon: −1/3-1/3−1/3 Strangeness: 111

  27. What are the beta minus decay equations?

    n→p+e−+νeˉn \rightarrow p + e^- + \bar{\nu_e}n→p+e−+νe​ˉ​ d→u+e−+νeˉd \rightarrow u + e^- + \bar{\nu_e}d→u+e−+νe​ˉ​

  28. What are the beta plus decay equations?

    p→n+e++νep \rightarrow n + e^+ + \nu_ep→n+e++νe​ u→d+e++νeu \rightarrow d + e^+ + \nu_eu→d+e++νe​

  29. What particle quantities are always conserved?

    Energy / Mass Momentum Charge Baryon number Lepton number (Lepton generations)

  30. What is the quark composition of the K+K^+K+ particle?

    K+K^+K+ = usˉu \bar{s}usˉ

  31. What is the quark composition of the K0K^0K0 particle?

    K0K^0K0 = dsˉd \bar{s}dsˉ / dˉs\bar{d}sdˉs

  32. What is the quark composition of the K−K^-K− particle?

    K−K^-K− = uˉs\bar{u}suˉs

  33. What is the quark composition of the π+\pi^+π+ particle?

    π+\pi^+π+ = udˉu \bar{d}udˉ

  34. What is the quark composition of the π0\pi^0π0 particle?

    π0\pi^0π0 = uuˉu \bar{u}uuˉ / ddˉd \bar{d}ddˉ

  35. What is the quark composition of the π−\pi^-π− particle?

    π−\pi^-π− = uˉd\bar{u} duˉd