pdgLive Home   >   ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}$ MESONS (including possibly non-${\mathit {\mathit q}}{\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{b1}}{(1P)}}$

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

INSPIRE   JSON  (beta) PDGID: M077

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

Observed in radiative decay of the ${{\mathit \Upsilon}{(2S)}}$, therefore ${}^{C} = +$. Branching ratio requires E1 transition, M1 is strongly disfavored, therefore ${}^{P} = +$. $\mathit J = 1$ from SKWARNICKI 1987 .

${{\mathit \chi}_{{b1}}{(1P)}}$ MASS   $9892.78 \pm0.26 \pm0.31$ MeV

${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(2S)}}$ DECAY   $129.63 \pm0.33$ MeV (S = 1.3)

B( ${{\mathit \chi}_{{b1}}{(1P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$ ) ${\times }$ B( ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{b1}}{(1P)}}$ ) ${\times }$ B( ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ )   $(5.90 \pm0.34) \times 10^{-4}$  (S = 1.3)

B( ${{\mathit \chi}_{{b1}}{(1P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$ ) ${\times }$ B( ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{b1}}{(1P)}}$ ) ${\times }$ B( ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ )   $(1.30 \pm0.34) \times 10^{-5}$

B( ${{\mathit \chi}_{{b2}}{(1P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}}$ )/B( ${{\mathit \chi}_{{b1}}{(1P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}}$ )   $1.07 \pm0.04$

B( ${{\mathit \chi}_{{b0}}{(1P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}}$ )/B( ${{\mathit \chi}_{{b1}}{(1P)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}}{+}$ ${{\overline{\mathit p}}}{{\mathit X}}$ )   $1.11 \pm0.25$

${{\mathit \chi}_{{b1}}{(1P)}}$ DECAY MODES
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \gamma}}{{\mathit \Upsilon}{(1S)}}$   $(35.2\pm{2.0})\%$ 423   $\Gamma_{2}$ ${{\mathit D}^{0}}{{\mathit X}}$   $(12.6\pm{2.2})\%$     $\Gamma_{3}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$   $(2.0\pm{0.6})\times 10^{-4}$ 4892   $\Gamma_{4}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$   $(1.3\pm{0.5})\times 10^{-4}$ 4892   $\Gamma_{5}$ 2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ 2 ${{\mathit \pi}^{0}}$   $<6\times 10^{-4}$ CL=90% 4863   $\Gamma_{6}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$   $(8.0\pm{2.5})\times 10^{-4}$ 4921   $\Gamma_{7}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$   $(1.5\pm{0.5})\times 10^{-4}$ 4878   $\Gamma_{8}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$   $(3.5\pm{1.2})\times 10^{-4}$ 4863   $\Gamma_{9}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$2 ${{\mathit \pi}^{0}}$   $(8.6\pm{3.2})\times 10^{-4}$ 4845   $\Gamma_{10}$ 3 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$   $(9.3\pm{3.3})\times 10^{-4}$ 4844   $\Gamma_{11}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$   $(1.9\pm{0.6})\times 10^{-4}$ 4921   $\Gamma_{12}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$   $(1.7\pm{0.5})\times 10^{-3}$ 4898   $\Gamma_{13}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$   $(2.6\pm{0.8})\times 10^{-4}$ 4844   $\Gamma_{14}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$   $(7.5\pm{2.6})\times 10^{-4}$ 4825   $\Gamma_{15}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$   $(2.6\pm{0.9})\times 10^{-4}$ 4897   $\Gamma_{16}$ 4 ${{\mathit \pi}^{+}}$4 ${{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$   $(1.4\pm{0.6})\times 10^{-3}$ 4867   $\Gamma_{17}$ ${{\mathit \omega}}$ anything   $(4.9\pm{1.4})\%$     $\Gamma_{18}$ ${{\mathit \omega}}{{\mathit X}_{{tetra}}}$   $<4.44\times 10^{-4}$ CL=90%     $\Gamma_{19}$ ${{\mathit J / \psi}}{{\mathit J / \psi}}$   $<2.7\times 10^{-5}$ CL=90% 3857   $\Gamma_{20}$ ${{\mathit J / \psi}}{{\mathit \psi}{(2S)}}$   $<1.7\times 10^{-5}$ CL=90% 3594   $\Gamma_{21}$ ${{\mathit \psi}{(2S)}}{{\mathit \psi}{(2S)}}$   $<6\times 10^{-5}$ CL=90% 3298   $\Gamma_{22}$ ${{\mathit J / \psi}{(1S)}}$ anything   $<1.1\times 10^{-3}$ CL=90%     $\Gamma_{23}$ ${{\mathit J / \psi}{(1S)}}{{\mathit X}_{{tetra}}}$   $<2.27\times 10^{-4}$ CL=90%
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