SEMILEPTONIC FORM FACTORS

$\mathit r_{2}{}\equiv\mathit A_{2}(0)/\mathit A_{1}$(0) in ${{\mathit D}^{+}}$ $\rightarrow$ ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$

INSPIRE   JSON  (beta) PDGID:
S031FR2
See also BRIERE 2010 for ${{\overline{\mathit K}}^{*}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$ helicity-basis form-factor measurements.
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 0.794 \pm0.020}$ OUR AVERAGE
$0.72$ $\pm0.06$ $\pm0.02$ 3.8k 1
ABLIKIM
2024CS
 BES3 ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}$
$0.788$ $\pm0.042$ $\pm0.008$ 16.2k
ABLIKIM
2016F
 BES3 ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}$
$0.801$ $\pm0.020$ $\pm0.020$ 2
DEL-AMO-SANCH..
2011I
 BABR
$0.875$ $\pm0.049$ $\pm0.064$ 15k 3
LINK
2002L
 FOCS ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$1.00$ $\pm0.15$ $\pm0.03$ 763
ADAMOVICH
1999
BEAT ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$0.71$ $\pm0.08$ $\pm0.09$ 3000
AITALA
1998B
 E791 ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}$
$0.75$ $\pm0.08$ $\pm0.09$ 3034
AITALA
1998F
 E791 ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$0.78$ $\pm0.18$ $\pm0.10$ 874
FRABETTI
1993E
 E687 ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$0.82$ ${}^{+0.22}_{-0.23}$ $\pm0.11$ 305
KODAMA
1992
E653 ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$0.0$ $\pm0.5$ $\pm0.2$ 183
ANJOS
1990E
 E691 ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}$
1  ABLIKIM 2024CS uses a single-pole dominance parameterization.
2  DEL-AMO-SANCHEZ 2011I finds the pole mass ${\mathit m}_{{{\mathit A}}}$ = ($2.63$ $\pm0.10$ $\pm0.13$) GeV (${\mathit m}_{{{\mathit V}}}$ is fixed at 2 GeV).
3  LINK 2002L includes the effects of interference with an $\mathit S$-wave background. This much improves the goodness of fit, but does not much shift the values of the form factors.
References