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.

$\Gamma _{L}/\Gamma $ in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \rho}^{0}}{{\mathit \rho}^{0}}$

INSPIRE   JSON  (beta) PDGID:
S042P01
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ 0.71 {}^{+0.08}_{-0.09}}$ OUR AVERAGE  Error includes scale factor of 1.6.  See the ideogram below.
$0.745$ ${}^{+0.048}_{-0.058}$ $\pm0.034$
AAIJ
2015T
LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$0.21$ ${}^{+0.18}_{-0.22}$ $\pm0.15$
VANHOEFER
2014
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.75$ ${}^{+0.11}_{-0.14}$ $\pm0.05$
AUBERT
2008BB
BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$0.87$ $\pm0.13$ $\pm0.04$
AUBERT
2007G
BABR Repl. by AUBERT 2008BB

           $\Gamma _{L}/\Gamma $ in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \rho}^{0}}{{\mathit \rho}^{0}}$
References