POLARIZATION IN ${{\mathit B}^{0}}$ DECAY

In decays involving two vector mesons, one can distinguish among the states in which meson polarizations are both longitudinal ($\mathit L$) or both are transverse and parallel ($\parallel$) or perpendicular ($\perp$) to each other with the parameters $\Gamma _{L}/\Gamma $, $\Gamma _{}/\Gamma $, and the relative phases $\phi _{\parallel}$ and $\phi _{\perp}$. See the definitions in the note on “Polarization in ${{\mathit B}}$ Decays” review in the ${{\mathit B}^{0}}$ Particle Listings.

$\Delta (\Gamma _{\mathit L}/\Gamma $) in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit D}^{*-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$

INSPIRE   JSON  (beta) PDGID:
S042A49
$\Delta (\Gamma _{\mathit L}/\Gamma $) = ($\Gamma _{\mathit L}/\Gamma ){}^{{{\mathit \mu}}}$ $−$ ($\Gamma _{\mathit L}/\Gamma ){}^{e}$
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ 0.008 \pm0.008}$ OUR AVERAGE
$0.006$ $\pm0.007$ $\pm0.005$
ADACHI
2023J
 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.033$ $\pm0.033$ $\pm0.010$
PRIM
2023
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
References