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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

Evidence for the decay $$B^0to pbar{p}pi^0$$

Pal, B.*; 谷田 聖; Belle Collaboration*; 他173名*

Physical Review D, 99(9), p.091104_1 - 091104_8, 2019/05

AA2019-0571.pdf:0.38MB

https://doi.org/10.1103/PhysRevD.99.091104
 被引用回数：6 パーセンタイル：36.14(Astronomy & Astrophysics)

We report a search for the charmless baryonic decay $$B^0to pbar{p}pi^0$$ with a data sample corresponding to an integrated luminosity of 711~$$rm fb^{-1}$$ containing $$(772pm 10)times 10^6$$ $$B^0bar{B}^0$$ pairs. The data was collected by the Belle experiment running on the $$Upsilon(4S)$$ resonance at the KEKB $$e^+e^-$$ collider. We measure a branching fraction $$mathcal{B}(B^0to pbar{p}pi^0)= (5.0pm1.8pm0.6)times 10^{-7}$$, where the first uncertainty is statistical and the second is systematic. The signal has a significance of 3.1 standard deviations and constitutes the first evidence for this decay mode. We also search for the intermediate two-body decays $$B^{0}toDelta^+bar{p}$$ and $$B^0tobar{Delta}^-p$$, and set an upper limit on the branching fraction: $$mathcal{B}(B^0to Delta^+bar{p})+mathcal{B}(B^0tobar{Delta}^-p) < 1.6times10^{-6}$$ at 90% confidence level.

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