${{\boldsymbol \chi}_{{b2}}{(1P)}}$ Cross-Particle Branching Ratios

B( ${{\boldsymbol \chi}_{{b2}}{(1P)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol \Upsilon}{(1S)}}$ ) ${\times }$ B( ${{\boldsymbol \Upsilon}{(2S)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol \chi}_{{b2}}{(1P)}}$ ) ${\times }$ B( ${{\boldsymbol \Upsilon}{(1S)}}$ $\rightarrow$ ${{\boldsymbol \ell}^{+}}{{\boldsymbol \ell}^{-}}$ ) INSPIRE search

VALUE ($ 10^{-4} $) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 3.38 \pm0.16}$ OUR AVERAGE
$3.63$ ${}^{+0.36}_{-0.34}$ ${}^{+0.18}_{-0.19}$ 1
LEES
2014M
BABR ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$
$3.29$ $\pm0.09$ $\pm0.16$ 1770
KORNICER
2011
CLEO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
$4.4$ $\pm0.9$ $\pm0.5$ 35
WALK
1986
CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
1  From a sample of ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ with converted photons.
  References:
LEES 2014M
PR D90 112010 Bottomonium Spectroscopy and Radiative Transitions Involving the ${{\mathit \chi}_{{bJ}}{(1P,2P)}}$ States at BABAR
KORNICER 2011
PR D83 054003 Measurements of Branching Fractions for Electromagnetic Transitions Involving the ${{\mathit \chi}_{{bJ}}{(1P)}}$ States
WALK 1986
PR D34 2611 The ${{\mathit \chi}_{{b}}}$ States in Exclusive Radiative Decay of the ${{\mathit \Upsilon}{(2S)}}$