Metodický úvod (určenie konštanty α s )

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# Metodický úvod (určenie konštanty α s ) - PowerPoint PPT Presentation

Metodický úvod (určenie konštanty α s ). Detektor DELPHI. SCHÉMA DETEKTORA VO FYZIKE ČASŤÍC. Identifikácia častíc. Rozpady Z 0 (10 -24 s). Pri E CMS =91 GeV e + e -  Z 0 Z 0  e + e - (3,67%) Z 0  μ + μ - (3,67%) Z 0  τ + τ - (3,67%) Z 0   qq ( 2 jety ) (60%)

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Metodický úvod

(určenie konštanty αs)

### Identifikácia častíc

Pri ECMS=91 GeV e+e- Z0

Z0 e+e- (3,67%)

Z0 μ+μ- (3,67%)

Z0τ+τ- (3,67%)

Z0qq( 2 jety ) (60%)

Z0qq g( 3 jety ) (24%)

Z04 a viac jetov(6%)

DELPHI

DELPHI

### Rozpad na mión a antimión: e+ e- → Z0 → μ+ μ-

e+e-Z0t+t-m+m-

než ju stihneme zaregistrovať

t– -> nt + e– +net+ -> ne + e+ +nτv 17% prípadov

t– -> nt + m– +nmt+ -> nμ + m+ +nτv 17% prípadov

τ+τ– e+e- + 4 neutrína

τ+τ– μ+μ- + 4 neutrína

τ+τ– μ+e- + 4 neutrína

DELPHI

Z0 → τ+τ–