Forward-backward asymmetry ine−+e+→q+q¯→π,K,D,…,+X

The forward-backward asymmetry

A_{M}

due to weak-electromagnetic interference effects in the inclusive process

e^{-} + e^{+} \to M + X

, where

M

is a pseudoscalar meson, is calculated in terms of the axial-vector weak neutral-current couplings

b_{q}

of the quarks composing

M

, their electric charges

Q_{q}

, and the ratio

D (x)

of their (

q \to M

) fragmentation probabilities. Thus, if

b_{q}

and

Q_{q}

are considered known, (i) a measurement of

A_{M}

effectively determines

D (x)

, and (ii) for mesons composed of a light quark and a heavy quark a theoretical argument indicates that

A_{M}

is independent of

D (x)

so that the result of a measurement of

A_{M}

is immediately predictable.

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