${{\mathit K}^{\pm}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\mathit \nu}}{{\mathit \gamma}}$ FORM FACTORS

For definitions of the axial-vector $\mathit F_{\mathit A}$ and vector $\mathit F_{\mathit V}$ form factor, see the “Note on ${{\mathit \pi}^{\pm}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\mathit \nu}}{{\mathit \gamma}}$ and ${{\mathit K}^{\pm}}$ $\rightarrow$ ${{\mathit \ell}^{\pm}}{{\mathit \nu}}{{\mathit \gamma}}$ Form Factors” in the ${{\mathit \pi}^{\pm}}$ section. In the kaon literature, often different definitions $\mathit a_{\mathit K}$ = $\mathit F_{\mathit A}/\mathit m_{\mathit K}$ and $\mathit v_{\mathit K}$ = $\mathit F_{\mathit V}/{\mathit m}_{{{\mathit K}}}$ are used.

$\mathit F_{\mathit A}$ $+$ $\mathit F_{\mathit V}$, SUM OF AXIAL-VECTOR AND VECTOR FORM FACTOR FOR ${{\mathit K}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \nu}_{{{\mu}}}}{{\mathit \gamma}}$

INSPIRE   JSON  (beta) PDGID:
S010F+M
VALUE CL% EVTS DOCUMENT ID TECN CHG
$0.165$ $\pm0.007$ $\pm0.011$ 2588 1
ADLER
2000B
 B787 +
• • We do not use the following data for averages, fits, limits, etc. • •
$-1.2\text{ to }1.1 $ 90
DEMIDOV
1990
XEBC
$<0.23$ 90 1
AKIBA
1985
SPEC
1  Quotes absolute value. Sign not determined.
References