${{\boldsymbol \pi}^{\pm}}$ FORM FACTORS

VECTOR FORM FACTOR SLOPE PARAMETER $\boldsymbol a$ INSPIRE search

This is $\mathit a$ in $\mathit F_{V}$(q${}^{2}$) = $\mathit F_{V}$(0) (1 + $\mathit a$ q${}^{2}$)

VALUE

EVTS

DOCUMENT ID

TECN

COMMENT

$0.10$ $\pm0.06$

65k

BYCHKOV

2009

PIBE

${{\mathit e}^{+}}{{\mathit \nu}}{{\mathit \gamma}}$ at rest

References:

BYCHKOV

2009

PRL 103 051802

New Precise Measurement of the Pion Weak Form Factors in ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit \nu}}{{\mathit \gamma}}$ Decay