Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Lepton na farko da aka caje, wutan lantarki, masana kimiyya da yawa ne suka yi ka'ida a tsakiyar karni na 19 kuma J. J. Thomson ne ya gano shi a shekara ta 1897. Lepton na gaba da za a lura shi ne muon, wanda Carl D. Anderson ya gano a 1936, wanda aka rarraba shi a matsayin meson a lokacin. Bayan bincike, an fahimci cewa muon ba shi da kaddarorin da ake tsammani na meson, amma ya yi kama da lantarki, kawai tare da mafi girma. Ya ɗauki har zuwa 1947 don ra'ayin "leptons" a matsayin dangi na barbashi da za a ba da shawara. Neutrino na farko, neutrino na lantarki, Wolfgang Pauli ne ya gabatar da shi a cikin 1930 don bayyana wasu halaye na lalacewar beta. An fara lura da shi a cikin gwajin neutrino na Cowan <unk> Reines wanda Clyde Cowan da Frederick Reines suka gudanar a shekarar 1956. Leon M. Lederman, Melvin Schwartz, da Jack Steinberger sun gano muon neutrino a cikin 1962, kuma Martin Lewis Perl da abokan aikinsa daga Cibiyar Stanford Linear Accelerator da Lawrence Berkeley National Laboratory sun gano tau tsakanin 1974 da 1977. Tau neutrino ya kasance mai ban mamaki har zuwa Yuli 2000, lokacin da haɗin gwiwar DONUT daga Fermilab ya ba da sanarwar gano shi. Leptons wani muhimmin ɓangare ne na Standard Model. Electrons suna ɗaya daga cikin abubuwan da ke cikin atoms, tare da protons da neutrons. Hakanan za'a iya hada abubuwa masu ban mamaki tare da muons da taus maimakon electrons, da kuma lepton <unk> antilepton barbashi kamar positronium.  Tambaya: Wane gwaji ne Cowan da Reines suka yi?
Cowan <unk> Reines neutrino