pdgLive Home   >   ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ MESONS (including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{{b1}}}{(2P)}}$

${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ MESONS (including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)

INSPIRE   JSON PDGID: M080

${{\mathit \chi}_{{{b1}}}{(2P)}}$ $I^G(J^{PC})$ = $0^+(1^{+ +})$ J need confirmation.

Observed in radiative decay of the ${{\mathit \Upsilon}{(3S)}}$, therefore ${}^{C} = +$. Branching ratio requires E1 transition, M1 is strongly disfavored, therefore ${}^{P} = +$.

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${{\mathit \chi}_{{{b1}}}{(2P)}}$ MASS $10255.46$ $\pm0.22$ $\pm0.50$ MeV

${\mathit m}_{{{\mathit \chi}_{{{b1}}}{(2P)}}}-{\mathit m}_{{{\mathit \chi}_{{{b0}}}{(2P)}}}$ $23.5$ $\pm1.0$ MeV

${\mathit m}_{{{\mathit \chi}_{{{b1}}}{(2P)}}}-{\mathit m}_{{{\mathit \Upsilon}{(1S)}}}$ $793.6$ $\pm0.8$ MeV

${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(3S)}}$ DECAY $99.26$ $\pm0.22$ MeV

▸  exp ${{\mathit \chi}_{{{b1}}}{(2P)}}$ Cross-Particle Branching Ratios

B(${{\mathit \chi}_{{{b1}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b1}}}{(2P)}}$) ${\times }$ B(${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$) ($2.9$ $\pm0.4$) $ \times 10^{-4}$  (S = 1.9)

B(${{\mathit \chi}_{{{b1}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(2S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b1}}}{(2P)}}$) ${\times }$ B(${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$) ($3.8$ $\pm0.6$) $ \times 10^{-4}$  (S = 1.8)

B(${{\mathit \chi}_{{{b1}}}{(2P)}}$ $\rightarrow$ ${{\mathit \chi}_{{{b1}}}{(1P)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \chi}_{{{b1}}}{(2P)}}{{\mathit X}}$) $0.00116$ $\pm0.00014$

B(${{\mathit \chi}_{{{b2}}}{(2P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}})/B({{\mathit \chi}_{{{b1}}}{(2P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}}$) $1.11$ $\pm0.04$

B(${{\mathit \chi}_{{{b0}}}{(2P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}})/B({{\mathit \chi}_{{{b1}}}{(2P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}}$) $1.08$ $\pm0.07$

${{\mathit \chi}_{{{b1}}}{(2P)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \omega}}{{\mathit \Upsilon}{(1S)}}$ ($1.63^{+0.40}_{-0.34}$ ) $\%$ 134   $\Gamma_{2}$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(2S)}}$ ($18.1$ $\pm1.9$ ) $\%$ 229   $\Gamma_{3}$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$ ($9.9$ $\pm1.0$ ) $\%$ 764   $\Gamma_{4}$ ${{\mathit \pi}}{{\mathit \pi}}{{\mathit \chi}_{{{b1}}}{(1P)}}$ ($9.1$ $\pm1.3$) $ \times 10^{-3}$ 238   $\Gamma_{5}$ ${{\mathit D}^{0}}{{\mathit X}}$ ($8.8$ $\pm1.7$ ) $\%$     $\Gamma_{6}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ ($3.1$ $\pm1.0$) $ \times 10^{-4}$ 5075   $\Gamma_{7}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ ($1.1$ $\pm0.5$) $ \times 10^{-4}$ 5075   $\Gamma_{8}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ 2 ${{\mathit \pi}^{0}}$ ($7.7$ $\pm3.2$) $ \times 10^{-4}$ 5047   $\Gamma_{9}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ ($5.9$ $\pm2.0$) $ \times 10^{-4}$ 5104   $\Gamma_{10}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ ($1.0$ $\pm0.4$) $ \times 10^{-4}$ 5062   $\Gamma_{11}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ ($5.5$ $\pm1.8$) $ \times 10^{-4}$ 5047   $\Gamma_{12}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$2 ${{\mathit \pi}^{0}}$ ($1.0$ $\pm0.4$) $ \times 10^{-3}$ 5030   $\Gamma_{13}$ 3 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ ($6.7$ $\pm2.6$) $ \times 10^{-4}$ 5029   $\Gamma_{14}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$ ($1.2$ $\pm0.4$) $ \times 10^{-4}$ 5103   $\Gamma_{15}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ ($1.2$ $\pm0.4$) $ \times 10^{-3}$ 5081   $\Gamma_{16}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ ($2.0$ $\pm0.8$) $ \times 10^{-4}$ 5029   $\Gamma_{17}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ ($6.1$ $\pm2.2$) $ \times 10^{-4}$ 5011   $\Gamma_{18}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$ ($1.7$ $\pm0.6$) $ \times 10^{-4}$ 5080   $\Gamma_{19}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ ($1.9$ $\pm0.7$) $ \times 10^{-3}$ 5051