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Search for the $$B to Y(4260) K, Y(4260) to J/psi pi^+pi^-$$ decays

$$B to Y(4260) K, Y(4260) to J/psi pi^+pi^-$$の探索

Garg, R.*; 谷田 聖   ; Belle Collaboration*; 他172名*

Garg, R.*; Tanida, Kiyoshi; Belle Collaboration*; 172 of others*

We report the results of a search for the $$B to Y(4260) K, Y(4260)to J/psipi^+pi^-$$ decays. This study is based on a data sample corresponding to an integrated luminosity of 711 fb$$^{-1}$$, collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. We investigate the $$J/psipi^+pi^-$$ invariant mass distribution in the range 4.0 to 4.6 GeV/$$c^2$$ using both $$B^+ to J/psi pi^+pi^- K^+$$ and $$B^0 to J/psi pi^+pi^- K^0_S$$ decays. We find excesses of events above the background levels, with a significances of 2.1 and 0.9 standard deviations for charged and neutral $$B to Y(4260) K$$ decays, respectively, taking into account the systematic uncertainties. These correspond to upper limits on the product of branching fractions, $${cal B}(B^+ to Y(4260) K^+) times {cal B}(Y(4260) to J/psi pi^+ pi^-) < 1.4 times 10^{-5}$$ and $${cal B}(B^0 to Y(4260) K^0) times {cal B}(Y(4260) to J/psi pi^+ pi^-) < 1.7 times 10^{-5}$$ at the 90% confidence level.

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パーセンタイル:20.12

分野:Astronomy & Astrophysics

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