The Standard Model

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Across
  1. 2. Receding galaxies show this shift in their wavelengths
  2. 4. group includes positrons
  3. 7. Composed of uud quarks
  4. 8. Should be massless but isn’t
  5. 13. Occur in twos or threes, not alone
  6. 15. carry away excess energy after a nuclear interaction Photon
  7. 16. Composed of udd quarks
  8. 17. A type of neutrino
  9. 18. Can be converted into mass
  10. 23. Proportions of matter and antimatter are not
  11. 24. Particles interact with this to acquire mass
Down
  1. 1. We now know that it’s increasing
  2. 3. The whole universe is doing this
  3. 5. Delta particles have 3/2
  4. 6. This property must be conserved in the Standard Model
  5. 9. A cheerful quark flavour
  6. 10. Gluon stick quarks together
  7. 11. Most of the universe is made of this?
  8. 12. Early on, an energetic photon would hit a newly-formed H atom and this would happen
  9. 14. An intriguing quark flavour
  10. 19. We live in the milky one
  11. 20. A type of field particle
  12. 21. A meson or bayron
  13. 22. A delightful quark flavour