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${\mathit m}_{{{\mathit \chi}_{{b2}}{(1P)}}}–{\mathit m}_{{{\mathit \chi}_{{b1}}{(1P)}}}$

INSPIRE   PDGID:

M078DM2

VALUE (MeV) DOCUMENT ID TECN  COMMENT $\bf{ 19.10 \pm0.25}$ OUR AVERAGE  Error includes scale factor of 1.1. $19.81$ $\pm0.65$ $\pm0.20$ 1 AAIJ 2014 BG LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit X}}$ $19.01$ $\pm0.24$ LEES 2014 M BABR ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ 1  From the ${{\mathit \chi}_{{bj}}{(1P)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \gamma}}$ transition.

References:

AAIJ 2014BG JHEP 1410 088 Measurement of the ${{\mathit \chi}_{{b}}{(3P)}}$ Mass and of the Relative Rate of ${{\mathit \chi}_{{b1}}{(1P)}}$ and ${{\mathit \chi}_{{b2}}{(1P)}}$ Production LEES 2014M PR D90 112010 Bottomonium Spectroscopy and Radiative Transitions Involving the ${{\mathit \chi}_{{bJ}}{(1P,2P)}}$ States at BABAR