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論文

First search for the $$eta_{c2}(1D)$$ in $$B$$ decays at Belle

Chilikin, K.*; 谷田 聖; Belle Collaboration*; 他194名*

Journal of High Energy Physics (Internet), 2020(5), p.34_1 - 34_22, 2020/05

https://doi.org/10.1007/JHEP05(2020)034
 被引用回数：2 パーセンタイル：16.06(Physics, Particles & Fields)

The first dedicated search for the $$eta_{c2}(1D)$$ is carried out using the decays $$B^+ rightarrow eta_{c2}(1D) K^+$$, $$B^0 rightarrow eta_{c2}(1D) K^0_S$$, $$B^0 rightarrow eta_{c2}(1D) pi^- K^+$$, and $$B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S$$ with $$eta_{c2}(1D) to h_c gamma$$. No significant signal is found. For the $$eta_{c2}(1D)$$ mass range between $$3795$$ and $$3845 mathrm{MeV}/c^2$$, the branching-fraction upper limits are determined to be $$mathcal{B}(B^+ rightarrow eta_{c2}(1D) K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.7 times 10^{-5}$$, $$mathcal{B}(B^0 rightarrow eta_{c2}(1D) K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.5 times 10^{-5}$$, $$mathcal{B}(B^0 rightarrow eta_{c2}(1D) pi^- K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.0 times 10^{-4}$$, and $$mathcal{B}(B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.1 times 10^{-4}$$ at 90% C. L. The analysis is based on the 711 $$mathrm{fb}^{-1}$$ data sample collected on the $$Upsilon(4S)$$ resonance by the Belle detector, which operated at the KEKB asymmetric-energy $$e^+ e^-$$ collider.

論文

Evidence for $$B^+ rightarrow h_c K^+$$ and observation of $$eta_c(2S) to p bar{p} pi^+ pi^-$$

Chilikin, K.*; 谷田 聖; Belle Collaboration*; 他173名*

Physical Review D, 100(1), p.012001_1 - 012001_16, 2019/07

https://doi.org/10.1103/PhysRevD.100.012001
 被引用回数：5 パーセンタイル：31.16(Astronomy & Astrophysics)

A search for the decays $$B^+ rightarrow h_c K^+$$ and $$B^0 rightarrow h_c K_S^0$$ is performed. Evidence for the decay $$B^+ rightarrow h_c K^+$$ is found; its significance is $$4.8sigma$$. No evidence is found for $$B^0 rightarrow h_c K_S^0$$. The branching fraction for $$B^+ rightarrow h_c K^+$$ is measured to be $$(3.7^{+1.0}_{-0.9}{}^{+0.8}_{-0.8}) times 10^{-5}$$; the upper limit for the $$B^0 rightarrow h_c K_S^0$$ branching fraction is $$1.4 times 10^{-5}$$ at $$90%$$ C.L. In addition, a study of the $$p bar{p} pi^+ pi^-$$ invariant mass distribution in the channel $$B^+ to (p bar{p} pi^+ pi^-) K^+$$ results in the first observation of the decay $$eta_c(2S) to p bar{p} pi^+ pi^-$$ with $$12.1sigma$$ significance. The analysis is based on the 711 $$mathrm{fb}^{-1}$$ data sample collected by the Belle detector at the asymmetric-energy $$e^+ e^-$$ collider KEKB at the $$Upsilon(4S)$$ resonance.

論文

Observation of an alternative $$chi_{c0}(2P)$$ candidate in $$e^+e^- to J/psi Dbar{D}$$

Chilikin, K.*; 谷田 聖; Belle Collaboration*; 他167名*

Physical Review D, 95(11), p.112003_1 - 112003_17, 2017/06

AA2017-0237.pdf:0.72MB

https://doi.org/10.1103/PhysRevD.95.112003
 被引用回数：47 パーセンタイル：89.68(Astronomy & Astrophysics)

We perform a full amplitude analysis of the process $$e^+e^- to J/psi Dbar{D}$$, where $$D$$ refers to either $$D^+$$ or $$D^0$$. A new charmonium-like state $$X^*(3860)$$ that decays to $$Dbar{D}$$ is observed with a significance of $$6.5sigma$$. Its mass is $$(3862^{+26}_{-32}{}^{+40}_{-13})$$ MeV/$$c^2$$ and width is $$(201^{+154}_{-67}{}^{+88}_{-82})$$ MeV. The $$J^{PC}=0^{++}$$ hypothesis is favored over the $$2^{++}$$ hypothesis at the level of $$2.5sigma$$. The analysis is based on the 980 fb$$^{-1}$$ data sample collected by the Belle detector at the asymmetric-energy $$e^+e^-$$ collider KEKB.

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