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論文

Observation of $$Upsilon(4S)to eta' Upsilon(1S)$$

Guido, E.*; 谷田 聖; Belle Collaboration*; 他168名*

Physical Review Letters, 121(6), p.062001_1 - 062001_7, 2018/08

AA2018-0596.pdf:0.37MB

https://doi.org/10.1103/PhysRevLett.121.062001
 被引用回数：9 パーセンタイル：53.40(Physics, Multidisciplinary)

We report the first observation of the hadronic transition $$Upsilon(4S)toeta'Upsilon(1S)$$, using 496 fb$$^{-1}$$ data collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider. We reconstruct the $$eta'$$ meson through its decays to $$rho^0gamma$$ and to $$pi^+pi^-eta$$, with $$etatogammagamma$$. We measure: $${cal B}(Upsilon(4S)toeta'Upsilon(1S))=(3.43pm 0.88 {rm(stat.)} pm 0.21 {rm(syst.)})times10^{-5}$$, with a significance of 5.7$$sigma$$.

論文

Study of $$eta$$ and dipion transitions in $$Upsilon(4S)$$ decays to lower bottomonia

Guido, E.*; 谷田 聖; Belle Collaboration*; 他180名*

Physical Review D, 96(5), p.052005_1 - 052005_11, 2017/09

AA2017-0515.pdf:0.99MB

https://doi.org/10.1103/PhysRevD.96.052005
 被引用回数：15 パーセンタイル：55.70(Astronomy & Astrophysics)

We study hadronic transitions between bottomonium states using 496 fb$$^{-1}$$ data collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric energy $$e^+e^-$$ collider. We measure $$B(Upsilon(4S) to pi^+ pi^-Upsilon(1S)) = (8.2 pm 0.5 ({rm stat}) pm 0.4({rm syst})) times 10^{-5}$$, $$B(Upsilon(4S) to pi^+ pi^-Upsilon(2S)) = (7.9 pm 1.0 ({rm stat}) pm 0.4({rm syst})) times 10^{-5}$$, and $$B(Upsilon(4S) to eta Upsilon(1S)) = (1.70 pm 0.23 ({rm stat}) pm 0.08({rm syst})) times 10^{-4}$$. We measure the ratio of branching fractions $$R=B(Upsilon(4S) to eta Upsilon(1S))/B(Upsilon(4S) to pi^+ pi^-Upsilon(1S))=2.07 pm 0.30 ({rm stat}) pm 0.11({rm syst})$$. We search for the decay $$Upsilon(1^3D_{1,2}) to eta Upsilon(1S)$$, but do not find significant evidence for such a transition. We also measure the initial-state radiation production cross sections of the $$Upsilon(2S, 3S)$$ resonances and we find values compatible with the expected ones. Finally, the analysis of the $$Upsilon(4S) to pi^+ pi^-Upsilon(1S)$$ events shows indications for a resonant contribution due to the $$f_0(980)$$ meson.

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