${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{-}}$ / ${{\mathit \pi}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$ FORM FACTORS

$\mathit r_{2}{}\equiv\mathit a_{1}/\mathit a_{0}$ in ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$

INSPIRE   JSON  (beta) PDGID:
S032FP2
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -0.2 \pm2.2}$ OUR AVERAGE  Error includes scale factor of 1.7.  See the ideogram below.
$-1.4$ $\pm1.5$ $\pm0.5$ 6.3k
ABLIKIM
2015X
 BES3 ${{\mathit \ell}}={{\mathit e}}$, 3-parameter fit
$-4.2$ $\pm4.0$ $\pm1.9$ 5.3k
LEES
2015F
 BABR ${{\mathit \ell}}={{\mathit e}}$, 3-parameter fit
$6$ $\pm3$ $\pm0$
BESSON
2009
CLEO ${{\mathit \ell}}={{\mathit e}}$, 3-parameter fit

           $\mathit r_{2}{}\equiv\mathit a_{1}/\mathit a_{0}$ in ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$
References