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

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

INSPIRE   JSON  (beta) PDGID:
S032FP1
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -1.97 \pm0.28}$ OUR AVERAGE  Error includes scale factor of 1.4.  See the ideogram below.
$-1.84$ $\pm0.22$ $\pm0.07$ 6.3k 1
ABLIKIM
2015X
 BES3 ${{\mathit \ell}}={{\mathit e}}$, 3-parameter fit
$-1.31$ $\pm0.70$ $\pm0.43$ 5.3k
LEES
2015F
 BABR ${{\mathit \ell}}={{\mathit e}}$, 3-parameter fit
$-2.80$ $\pm0.49$ $\pm0.04$
BESSON
2009
CLEO ${{\mathit \ell}}={{\mathit e}}$, 3-parameter fit
1  The 2-parameter fit yields $-2.04$ $\pm0.08$ $\pm0.03$.

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