Measuring the weak isospin of $b$ quarks in $e^{+} e^{-}$ annihilation

Publisher Website

1 May 1992

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 45 (9) , 3262-3265
https://doi.org/10.1103/physrevd.45.3262

Abstract

From measurements of the

Z

decay width to

b

quarks

Γ (Z \to b \bar{b})

and the forward-backward asymmetry

A_{FB} (b)

of

b

quarks at

e^{+} e^{-}

colliders, the weak-isospin components of the left- and right-handed

b

quarks can unambiguously be determined:

I_{3}^{L} (b) = - \frac{1}{2}

and

I_{3}^{R} (b) = 0

. From the nonzero value of

I_{3}^{L} (b)

the top quark can be inferred as the isospin partner of the

b

quark.

Keywords

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