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Observation of $$Upsilon(2S)togamma eta_{b}(1S)$$ decay

$$Upsilon(2S)togamma eta_{b}(1S)$$崩壊の発見

Fulsom, B. G.*; 谷田 聖; Belle Collaboration*; 他197名*

Fulsom, B. G.*; Tanida, Kiyoshi; Belle Collaboration*; 197 of others*

We report the observation of $$Upsilon(2S)togammaeta_{b}(1S)$$ decay based on analysis of the inclusive photon spectrum of $$24.7$$ fb$$^{-1}$$ of $$e^+ e^-$$ collisions at the $$Upsilon(2S)$$ center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. We measure a branching fraction of $$mathcal{B}(Upsilon(2S)togammaeta_{b}(1S))=(6.1^{+0.6+0.9}_{-0.7-0.5})times 10^{-4}$$, and derive an $$eta_{b}(1S)$$ mass of $$9394.8^{+2.7+4.5}_{-3.1-2.7}$$ MeV/$$c^{2}$$, where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.

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パーセンタイル:100

分野:Physics, Multidisciplinary

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