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論文

Measurement of the decays $$Btoetaellnu_ell$$ and $$Btoeta^primeellnu_ell$$ in fully reconstructed events at Belle

Bele$~n$o, C.*; 谷田 聖; Belle Collaboration*; 他144名*

Physical Review D, 96(9), p.091102_1 - 091102_8, 2017/11

AA2018-0506.pdf:0.47MB

https://doi.org/10.1103/PhysRevD.96.091102
 被引用回数：4 パーセンタイル：23.73(Astronomy & Astrophysics)

We report branching fraction measurements of the decays $$B^+toetaell^+nu_ell$$ and $$B^+toeta^primeell^+nu_ell$$ based on 711~fb$$^{-1}$$ of data collected near the $$Upsilon(4S)$$ resonance with the Belle experiment at the KEKB asymmetric-energy $$e^+e^-$$ collider. This data sample contains 772 million $$Bbar B$$~events. One of the two $$B$$~mesons is fully reconstructed in a hadronic decay mode. Among the remaining ("signal-$$B$$") daughters, we search for the $$eta$$~meson in two decay channels, $$etatogammagamma$$ and $$etatopi^+pi^-pi^0$$, and reconstruct the $$eta^{prime}$$~meson in $$eta^primetoetapi^+pi^-$$ with subsequent decay of the $$eta$$ into $$gammagamma$$. Combining the two $$eta$$ modes and using an extended maximum likelihood, the $$B^+toetaell^+nu_ell$$ branching fraction is measured to be $$(4.2pm 1.1 (rm stat.)pm 0.3 (rm syst.))times 10^{-5}$$. For $$B^+toeta^primeell^+nu_ell$$, we observe no significant signal and set an upper limit of $$0.72times 10^{-4}$$ at 90% confidence level.

論文

Measurement of $$e^+e^- to pi^+pi^-psi(2S)$$ via initial state radiation at Belle

Wang, X. L.*; 谷田 聖; Belle Collaboration*; 他144名*

Physical Review D, 91(11), p.112007_1 - 112007_15, 2015/06

AA2015-0519.pdf:0.8MB

https://doi.org/10.1103/PhysRevD.91.112007
 被引用回数：117 パーセンタイル：97.68(Astronomy & Astrophysics)

We report measurement of the cross section of $$e^+e^- to pi^+pi^- psi(2S)$$ between 4.0 and 5.5 GeV, based on an analysis of initial state radiation events in a 980 $${rm fb^{-1}}$$ data sample recorded with the Belle detector. The properties of the $$Y(4360)$$ and $$Y(4660)$$ states are determined. Fitting the mass spectrum of $$pi^+pi^- psi(2S)$$ with two coherent Breit-Wigner functions, we find two solutions with identical mass and width but different couplings to electron-positron pairs: $$M_{Y(4360)}=(4347 pm 6 pm 3)$$ $${rm MeV}/c^2$$, $$Gamma_{Y(4360)} = (103 pm 9 pm 5)$$ MeV, $$M_{Y(4660)}=(4652 pm 10 pm 8)$$ $${rm MeV}/c^2$$, $$Gamma_{Y(4660)} = (68 pm 11 pm 1)$$ MeV, and $${cal B}[Y(4360) to pi^+pi^- psi(2S)]cdot Gamma^{e^+e^-}_{Y(4360)} = (10.9 pm 0.6 pm 0.7)$$ eV and $${cal B}[Y(4660)to pi^+pi^- psi(2S)]cdotGamma^{e^+e^-}_{Y(4660)}=(8.1 pm 1.1 pm 0.5)$$ eV for one solution; or $${cal B}[Y(4360) to pi^+pi^- psi(2S)]cdot Gamma^{e^+e^-}_{Y(4360)} = (9.2 pm 0.6 pm 0.6)$$ eV and $${cal B}[Y(4660)to pi^+pi^- psi(2S)]cdotGamma^{e^+e^-}_{Y(4660)}=(2.0 pm 0.3 pm 0.2)$$ eV for the other. Here, the first errors are statistical and the second systematic. Evidence for a charged charmoniumlike structure at 4.05 $${rm MeV}/c^2$$ is observed is observed in the $$pi^{pm}psi(2S)$$ intermediate state in the $$Y(4360)$$ decays.

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