pdgLive Home   >   ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ MESONS (including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{{b0}}}{(2P)}}$

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

INSPIRE   JSON PDGID: M079

${{\mathit \chi}_{{{b0}}}{(2P)}}$ $I^G(J^{PC})$ = $0^+(0^{+ +})$ 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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${{\mathit \chi}_{{{b0}}}{(2P)}}$ MASS $10232.5$ $\pm0.4$ $\pm0.5$ MeV

${\mathit m}_{{{\mathit \chi}_{{{b1}}}{(2P)}}}-{\mathit m}_{{{\mathit \chi}_{{{b0}}}{(2P)}}}$ $23.8$ $\pm1.7$ MeV

${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(3S)}}$ DECAY $121.9$ $\pm0.4$ MeV

▸  exp ${{\mathit \chi}_{{{b0}}}{(2P)}}$ BRANCHING RATIOS

B(${{\mathit \chi}_{{{b0}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b0}}}{(2P)}}$) ${\times }$ B(${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$) ($1.4$ $\pm0.9$) $ \times 10^{-5}$

[B(${{\mathit \chi}_{{{b0}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b0}}}{(2P)}}$)] / [B(${{\mathit \chi}_{{{b1}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b1}}}{(2P)}}$)] $0.017$ $\pm0.008$

B(${{\mathit \chi}_{{{b0}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(2S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b0}}}{(2P)}}$) ${\times }$ B(${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$) ($4.4$ $\pm1.6$) $ \times 10^{-5}$

[B(${{\mathit \chi}_{{{b0}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(2S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b0}}}{(2P)}}$)] / [B(${{\mathit \chi}_{{{b1}}}{(2P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(2S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b1}}}{(2P)}}$)] $0.033$ $\pm0.006$

${{\mathit \chi}_{{{b0}}}{(2P)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(2S)}}$ ($1.38$ $\pm0.30$ ) $\%$ 207   $\Gamma_{2}$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$ ($3.8$ $\pm1.7$) $ \times 10^{-3}$ 743   $\Gamma_{3}$ ${{\mathit D}^{0}}{{\mathit X}}$ <8.2 $\%$ CL=90%     $\Gamma_{4}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ $<3.4$ $\times 10^{-5}$ CL=90% 5064   $\Gamma_{5}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ $<5$ $\times 10^{-5}$ CL=90% 5063   $\Gamma_{6}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ 2 ${{\mathit \pi}^{0}}$ $<2.2$ $\times 10^{-4}$ CL=90% 5036   $\Gamma_{7}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ $<2.4$ $\times 10^{-4}$ CL=90% 5092   $\Gamma_{8}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $<1.5$ $\times 10^{-4}$ CL=90% 5050   $\Gamma_{9}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ $<2.2$ $\times 10^{-4}$ CL=90% 5035   $\Gamma_{10}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$2 ${{\mathit \pi}^{0}}$ $<1.1$ $\times 10^{-3}$ CL=90% 5019   $\Gamma_{11}$ 3 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ $<7$ $\times 10^{-4}$ CL=90% 5018   $\Gamma_{12}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$ $<7$ $\times 10^{-5}$ CL=90% 5091   $\Gamma_{13}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ $<1.2$ $\times 10^{-3}$ CL=90% 5070   $\Gamma_{14}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $<1.5$ $\times 10^{-4}$ CL=90% 5017   $\Gamma_{15}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ $<7$ $\times 10^{-4}$ CL=90% 4999   $\Gamma_{16}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$ $<1.7$ $\times 10^{-4}$ CL=90% 5069   $\Gamma_{17}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ $<6$ $\times 10^{-4}$ CL=90% 5039