${{\boldsymbol \chi}_{{b0}}{(1P)}}$ CROSS-PARTICLE BRANCHING RATIOS

B( ${{\boldsymbol \chi}_{{b0}}{(1P)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol \Upsilon}{(1S)}}$ ) ${\times }$ B( ${{\boldsymbol \Upsilon}{(2S)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol \chi}_{{b0}}{(1P)}}$ ) ${\times }$ B( ${{\boldsymbol \Upsilon}{(1S)}}$ $\rightarrow$ ${{\boldsymbol \ell}^{+}}{{\boldsymbol \ell}^{-}}$ ) INSPIRE search

VALUE ($ 10^{-5} $)

EVTS

DOCUMENT ID

TECN

COMMENT

$\bf{ 1.67 \pm0.28}$

OUR AVERAGE

$2.9$ ${}^{+1.7}_{-1.4}$ ${}^{+0.1}_{-0.8}$

LEES

2014

BABR

${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$

$1.63$ $\pm0.24$ $\pm0.15$

KORNICER

2011

CLEO

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$

¹ From a sample of ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ with one converted photon.

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