pdgLive Home   >   ${\mathit {\mathit b}}$ ${\mathit {\overline{\mathit b}}}$ MESONS (including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{{b0}}}{(1P)}}$

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

INSPIRE   JSON PDGID: M076

${{\mathit \chi}_{{{b0}}}{(1P)}}$ $I^G(J^{PC})$ = $0^+(0^{+ +})$ J need confirmation.

Observed in radiative decay of the ${{\mathit \Upsilon}{(2S)}}$, therefore ${}^{C} = +$. Branching ratio requires E1 transition, M1 is strongly disfavored, therefore ${}^{P} = +$.

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${{\mathit \chi}_{{{b0}}}{(1P)}}$ MASS $9859.44$ $\pm0.42$ $\pm0.31$ MeV

${\mathit m}_{{{\mathit \chi}_{{{b1}}}{(1P)}}}-{\mathit m}_{{{\mathit \chi}_{{{b0}}}{(1P)}}}$ $32.5$ $\pm0.9$ MeV

${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(2S)}}$ DECAY $162.5$ $\pm0.4$ MeV

▸  exp ${{\mathit \chi}_{{{b0}}}{(1P)}}$ CROSS-PARTICLE BRANCHING RATIOS

B(${{\mathit \chi}_{{{b0}}}{(1P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b0}}}{(1P)}}$) ${\times }$ B(${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$) ($1.67$ $\pm0.28$) $ \times 10^{-5}$

[B(${{\mathit \chi}_{{{b0}}}{(1P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b0}}}{(1P)}}$)] / [B(${{\mathit \chi}_{{{b1}}}{(1P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$) ${\times }$ B(${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{b1}}}{(1P)}}$)] $0.033$ $\pm0.004$

${{\mathit \chi}_{{{b0}}}{(1P)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$ ($1.94$ $\pm0.27$ ) $\%$ 391   $\Gamma_{2}$ ${{\mathit D}^{0}}{{\mathit X}}$ <10.4 $\%$ CL=90%     $\Gamma_{3}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ $<1.6$ $\times 10^{-4}$ CL=90% 4875   $\Gamma_{4}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ $<5$ $\times 10^{-5}$ CL=90% 4875   $\Gamma_{5}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ 2 ${{\mathit \pi}^{0}}$ $<5$ $\times 10^{-4}$ CL=90% 4846   $\Gamma_{6}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ $<2.1$ $\times 10^{-4}$ CL=90% 4905   $\Gamma_{7}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ ($1.1$ $\pm0.6$) $ \times 10^{-4}$ 4861   $\Gamma_{8}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ $<2.7$ $\times 10^{-4}$ CL=90% 4846   $\Gamma_{9}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$2 ${{\mathit \pi}^{0}}$ $<5$ $\times 10^{-4}$ CL=90% 4828   $\Gamma_{10}$ 3 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ $<1.6$ $\times 10^{-4}$ CL=90% 4827   $\Gamma_{11}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$ $<8$ $\times 10^{-5}$ CL=90% 4904   $\Gamma_{12}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ $<6$ $\times 10^{-4}$ CL=90% 4881   $\Gamma_{13}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ ($2.4$ $\pm1.2$) $ \times 10^{-4}$ 4827   $\Gamma_{14}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ $<1.0$ $\times 10^{-3}$ CL=90% 4808   $\Gamma_{15}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$ $<8$ $\times 10^{-5}$ CL=90% 4880   $\Gamma_{16}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ $<2.1$ $\times 10^{-3}$ CL=90% 4850   $\Gamma_{17}$ ${{\mathit J / \psi}}{{\mathit J / \psi}}$ $<7$ $\times 10^{-5}$ CL=90% 3836   $\Gamma_{18}$ ${{\mathit J / \psi}}{{\mathit \psi}{(2S)}}$ $<1.2$ $\times 10^{-4}$ CL=90% 3571   $\Gamma_{19}$ ${{\mathit \psi}{(2S)}}{{\mathit \psi}{(2S)}}$ $<3.1$ $\times 10^{-5}$ CL=90% 3273   $\Gamma_{20}$ ${{\mathit J / \psi}{(1S)}}$ anything $<2.3$ $\times 10^{-3}$ CL=90%