| 11. | In technicolor, something else must generate the quark and lepton masses.
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| 12. | TC to allow technifermions to couple to quarks and leptons.
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| 13. | These numbers are collectively known as lepton family numbers ( LF ).
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| 14. | Leptons are massive particles, therefore are subject to gravity.
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| 15. | He produced the tau lepton in the electron-positron collider at Stanford.
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| 16. | Leptons are a class of particles that do not interact strongly with matter.
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| 17. | The Standard Model recognizes two types of elementary fermions : quarks and leptons.
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| 18. | The remaining six fermions do not carry colour charge and are called leptons.
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| 19. | Leptons are an important part of the Standard Model.
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| 20. | To date, LEP is the most powerful accelerator of leptons ever built.
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