${\mathit m}_{{{\mathit \chi}_{{{b2}}}{(2P)}}}–{\mathit m}_{{{\mathit \chi}_{{{b1}}}{(2P)}}}$

INSPIRE   PDGID:
M081M2
VALUE (MeV) DOCUMENT ID TECN  COMMENT
$\bf{ 13.10 \pm0.24}$ OUR AVERAGE
$12.3$ $\pm2.6$ $\pm0.6$ 1
AAIJ
2014BG
LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit X}}$
$13.04$ $\pm0.26$
LEES
2014M
BABR ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$
$13.5$ $\pm0.4$ $\pm0.5$ 2
HEINTZ
1992
CSB2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}$ X, ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \gamma}}{{\mathit \gamma}}$
1  From the ${{\mathit \chi}_{{{bj}}}{(2P)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \gamma}}$ transition.
2  From the average photon energy for inclusive and exclusive events. Supersedes NARAIN 1991.
References