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Leptony

- obshee nazvanie klassa elementarnyh chastic, ne obladayushih sil'nym vzaimodeistviem, t.e. uchastvuyushih lish' v el.-magn., slabom i gra-vitac. vzaimodeistviyah. L. imeyut spin 1/2. Razlichayut zaryazhennye L. - elektron, myuon ($\mu$), $\tau$-lepton, i neitral'nye L. - neitrino. Zaryazhennye L. uchastvuyut kak v slabom, tak i v el.-magn. vzaimodeistviyah elementarnyh chastic. Neitral'nye L. uchastvuyut v slabom vzaimodeistvii. Zaryazhennye L. obladayut magnitnym momentom, ravnym, s tochnost'yu do vysshih popravok po el.-magn. vzaimodeistviyu, $e\hbar /2mc$. S toi zhe tochnost'yu magn. moment neitral'nyh L. raven nulyu. Neitral'nye L., vozmozhno, obladayut otlichnoi ot nulya maloi massoi pokoya. Massy zaryazhennyh L. sil'no razlichayutsya mezhdu soboi: massa elektrona me=0,511 MeV, massa myuona $m_\mu$105 MeV, massa $\tau$-leptona $m_\tau$= 1762 MeV. Dlya kazhdogo tipa zaryazhennyh L. - elektrona, myuona, $\tau$-leptona i dlya sootvetstvuyushih im neitrino sushestvuet svoe sohranyayusheesya leptonnoe chislo (sm. Zaryad).

Elektron, pozitron i neitrino stabil'ny. Myuon v vakuume imeet vremya zhizni $\approx 2\cdot 10^{-6}$ c otnositel'no raspada $\mu^+\to {\rm e}^+ + \nu_e + \tilde{\nu}_\mu (\mu^-\to {\rm e}^- + \tilde{\nu}_e + \nu_\mu)$. $\tau$-lepton raspadaetsya po kanalam: $\tau^+\to\tilde{\nu}_\tau$+mezony ($\tau^-\to\nu_\tau$+mezony) i $\tau^+\to\mu^+({\rm e}^+)+\tilde{\nu}_\tau+\nu_\mu(\nu_e) [\tau^-\to\mu^-+\nu_\tau]+ \tilde{\nu}_\mu(\tilde{\nu}_e)$ c vremenem zhizni ~ 10-13 s.

(M.Yu. Hlopov)


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Publikacii s klyuchevymi slovami: leptony - elementarnye chasticy
Publikacii so slovami: leptony - elementarnye chasticy
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