${{\mathit D}_{{{s}}}^{+}}$ Semileptonic Form Factors and Decay Constants

$\mathit r_{2}{}\equiv\mathit A_{2}(0)/\mathit A_{1}$(0) in ${{\mathit D}_{{{s}}}^{+}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$

INSPIRE   JSON  (beta) PDGID:
S034FR2
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 0.83 \pm0.08}$ OUR AVERAGE  Error includes scale factor of 1.8.  See the ideogram below.
$0.71$ $\pm0.14$ $\pm0.02$ 1
ABLIKIM
2023BZ
 BES3 ${{\mathit D}_{{{s}}}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$0.816$ $\pm0.036$ $\pm0.030$ 25k 2
AUBERT
2008AN
 BABR ${{\mathit \phi}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}$
$0.713$ $\pm0.202$ $\pm0.284$ 793
LINK
2004C
 FOCS ${{\mathit \phi}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$1.57$ $\pm0.25$ $\pm0.19$ 271
AITALA
1999D
 E791 ${{\mathit \phi}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}$, ${{\mathit \phi}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$1.4$ $\pm0.5$ $\pm0.3$ 308
AVERY
1994B
 CLE2 ${{\mathit \phi}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}$
$1.1$ $\pm0.8$ $\pm0.1$ 90
FRABETTI
1994F
 E687 ${{\mathit \phi}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
$2.1$ ${}^{+0.6}_{-0.5}$ $\pm0.2$ 19
KODAMA
1993
E653 ${{\mathit \phi}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$
1  Partial wave analysis of 939 ${{\mathit D}_{{{s}}}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}$ events.
2  To compare with previous measurements, this AUBERT 2008AN value is from a fit that fixes the pole masses at ${\mathit m}_{{{\mathit A}}}$ = 2.5 GeV/c${}^{2}$ and ${\mathit m}_{{{\mathit V}}}$ = 2.1 GeV/c${}^{2}$. A simultaneous fit to $\mathit r_{2}$, $\mathit r_{{\mathrm {v}}}$, $\mathit r_{0}$ (a significant $\mathit s$-wave contribution) and ${\mathit m}_{{{\mathit A}}}$, gives $\mathit r_{2}$ = $0.763$ $\pm0.071$ $\pm0.065$.

           $\mathit r_{2}{}\equiv\mathit A_{2}(0)/\mathit A_{1}$(0) in ${{\mathit D}_{{{s}}}^{+}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$
References