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論文

Measurements of branching fractions of $$Lambda_c^+ to Sigma^+ eta$$ and $$Lambda_c^+ to Sigma^+ eta'$$ and asymmetry parameters of $$Lambda_c^+ to Sigma^+ pi^0$$, $$Lambda_c^+ to Sigma^+ eta$$, and $$Lambda_c^+ to Sigma^+ eta'$$

Li, S. X.*; 谷田 聖; Belle Collaboration*; 他168名*

Physical Review D, 107(3), p.032003_1 - 032003_12, 2023/02

https://doi.org/10.1103/PhysRevD.107.032003
 被引用回数：6 パーセンタイル：52.01(Astronomy & Astrophysics)

We report a study of $$Lambda_c^+ to Sigma^+ pi^0$$, $$Lambda_c^+ to Sigma^+ eta$$, and $$Lambda_c^+ to Sigma^+ eta'$$ using the data sample corresponding to an integrated luminosity of 980 $$rm fb^{-1}$$ collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. The branching fractions relative to $$Lambda_c^+ to Sigma^+ pi^0$$ are measured as: $$mathcal{B}_{Lambda_c^+ to Sigma^+ eta}/mathcal{B}_{Lambda_c^+ to Sigma^+ pi^0}=0.25 pm 0.03 pm 0.01$$ and $$mathcal{B}_{Lambda_c^+ to Sigma^+ eta'}/mathcal{B}_{Lambda_c^+ to Sigma^+ pi^0}=0.33 pm 0.06 pm 0.02$$. Using $$mathcal{B}_{Lambda_c^+ to Sigma^+ pi^0}=(1.25 pm 0.10)%$$, we obtain $$mathcal{B}_{Lambda_c^+ to Sigma^+ eta}=(3.14 pm 0.35 pm 0.11 pm 0.25)times10^{-3}$$ and $$mathcal{B}_{Lambda_c^+ to Sigma^+ eta'}=(4.16 pm 0.75 pm 0.21 pm 0.33)times10^{-3}$$. Here the uncertainties are statistical, systematic, and from $$mathcal{B}_{Lambda_c^+ to Sigma^+ pi^0}$$, respectively. The ratio of the branching fraction of $$Lambda_c^+ to Sigma^+ eta'$$ with respect to that of $$Lambda_c^+ to Sigma^+ eta$$ is measured to be $$mathcal{B}_{Lambda_c^+ to Sigma^+ eta'}/mathcal{B}_{Lambda_c^+ to Sigma^+ eta}=1.34 pm 0.28 pm 0.06$$. We update the asymmetry parameter of $$Lambda_c^+ to Sigma^+ pi^0$$, $$alpha_{Sigma^+ pi^0} = -0.48 pm 0.02 pm 0.02$$, with a considerably improved precision. The asymmetry parameters of $$Lambda_c^+ to Sigma^+ eta$$ and $$Lambda_c^+ to Sigma^+ eta'$$ are measured to be $$alpha_{Sigma^+ eta} = -0.99 pm 0.03 pm 0.05$$ and $$alpha_{Sigma^+ eta'} = -0.46 pm 0.06 pm 0.03$$ for the first time.

論文

Observation of the radiative decays of $$Upsilon(1S)$$ to $$chi_{c1}$$

Katrenko, P.*; 谷田 聖; Belle Collaboration*; 他168名*

Physical Review Letters, 124(12), p.122001_1 - 122001_7, 2020/03

https://doi.org/10.1103/PhysRevLett.124.122001
 被引用回数：2 パーセンタイル：16.21(Physics, Multidisciplinary)

We report the first observation of the radiative decay of the $$Upsilon(1S)$$ into a charmonium state. The statistical significance of the observed signal of $$Upsilon(1S) to gamma chi_{c1}$$ is 6.3 standard deviations including systematics. The branching fraction is calculated to be Br($$Upsilon(1S) to gamma chi_{c1}$$) = $$(4.7^{+2.4}_{-1.8} (stat) ^{+0.4}_{-0.5} (sys)) times 10^{-5}$$. We also searched for $$Upsilon(1S)$$ radiative decays into $$chi_{c0,2}$$ and $$eta_c(1S,2S)$$ and set upper limits on their branching fractions. These results are obtained from a 24.9 fb$$^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider at a center-of-mass energy equal to the $$Upsilon(2S)$$ mass using $$Upsilon(1S)$$ tagging by the $$Upsilon(2S) to Upsilon(1S) pi^+pi^-$$ transitions.

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：11 パーセンタイル：51.60(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$$sigma$$.

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