pdgLive Home   >   ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ MESONS (including possibly non-${\mathit {\mathit q}}{\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{b2}}{(1P)}}$   >   B( ${{\mathit \chi}_{{b2}}{(1P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$ ) ${\times }$ B( ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{b2}}{(1P)}}$ ) ${\times }$ B( ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ )

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

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

INSPIRE   PDGID:

M078B01

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 2014 M 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 ${{\mathit \Upsilon}{(2S)}}$

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