Lepton (mechanika kwantowa)







Ten artykuł dotyczy mechaniki kwantowej. Zobacz też: inne znaczenia.

Leptony (z gr. λεπτός leptós - lekki, drobny, cienki)[1] − grupa 12 cząstek elementarnych (6 cząstek i 6 antycząstek). Zaliczają się do niej: elektron, mion, taon, neutrino elektronowe, neutrino mionowe, neutrino taonowe oraz odpowiadające im antycząstki: pozyton (antyelektron), antymion, antytaon i antyneutrina będące fermionami. Ostatnim odkrytym leptonem jest neutrino taonowe, odkryte w 2000 roku.


Wszystkie leptony, z wyjątkiem neutrin i antyneutrin, mają ładunek elektryczny ujemny (dla cząstek, np. elektronów) albo dodatni (dla antycząstek, np. pozytonów). Natomiast neutrina i antyneutrina mają zerowy ładunek elektryczny.


Leptony mają dwie specyficzne liczby kwantowe:




  • liczbę leptonową +1 dla leptonów i -1 dla antyleptonów - liczba ta jest zawsze zachowana

  • liczbę zapachową - elektrony i neutrina elektronowe mają „zapach” elektronowy dodatni, natomiast pozytony i antyneutrina elektronowe − ujemny, itd.


Liczba zapachowa nie jest zachowana w oscylacjach neutrin.
Leptony podlegają oddziaływaniom słabym.







Zobacz hasło lepton w Wikisłowniku


Przypisy |




  1. ↑ Władysław Kopaliński: LEPTO; lepta; leptosomatyk. W: Słownik Wyrazów Obcych [on-line]. [dostęp 2014-05-27].



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  • Masy, czasy życia i momenty magnetyczne leptonów











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