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Search for $$XYZ$$ states in $$Upsilon(1S)$$ inclusive decays

$$Upsilon(1S)$$の崩壊における$$XYZ$$粒子の探索

Shen, C. P.*; 谷田 聖; Belle Collaboration*; 他153名*

Shen, C. P.*; Tanida, Kiyoshi; Belle Collaboration*; 153 of others*

The branching fractions of the $$Upsilon(1S)$$ inclusive decays into final states with a $$J/psi$$ or a $$psi(2S)$$ are measured with improved precision to be $${cal B}(Upsilon(1S) to J/psi+ {rm anything})= (5.25 pm 0.13 ({rm stat}) pm 0.25({rm syst}))times10^{-4}$$ and $${cal B}(Upsilon(1S) to psi(2S)+ {rm anything})= (1.23 pm 0.17 ({rm stat}) pm 0.11({rm syst}))times10^{-4}$$. The first search for $$Upsilon(1S)$$ into $$XYZ$$ states that decay into a $$J/psi$$ or a $$psi(2S)$$ plus one or two charged tracks yields no significant signals for $$XYZ$$ states in any of the examined decay modes, and upper limits on their production rates in $$Upsilon(1S)$$ inclusive decays are determined.

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パーセンタイル:75.51

分野:Astronomy & Astrophysics

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