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論文

Inclusive study of bottomonium production in association with an $$eta $$ meson in $$e^+e^-$$ annihilations near $$Upsilon (5S)$$

Tamponi, U.*; 谷田 聖; Belle Collaboration*; 他174名*

European Physical Journal C, 78(8), p.633_1 - 633_10, 2018/08

 被引用回数:12 パーセンタイル:59.45(Physics, Particles & Fields)

We study bottomonium production in association with an $$eta$$ meson in $$e^+e^-$$ annihilations near the $$Upsilon(5S)$$, at a center of mass energy of $$sqrt{s}=10.866,$$GeV. The results are based on the $$121.4,$$fb$$^{-1}$$ data sample collected by the Belle experiment at the asymmetric energy KEKB collider. Only the $$eta$$ meson is reconstructed and the missing-mass spectrum of $$eta$$ candidates is investigated. We observe the $$e^+e^-toetaUpsilon_J(1D)$$ process and find evidence for the $$e^+e^-toetaUpsilon(2S)$$ process, while no significant signals of $$Upsilon(1S)$$, $$h_b(1P)$$, nor $$h_b(2P)$$ are found. Cross sections for the studied processes are reported.

論文

First observation of the hadronic transition $$Upsilon(4S) to eta h_b(1P)$$ and new measurement of the $$h_b(1P)$$ and $$eta_b(1S)$$ parameters

Tamponi, U.*; 谷田 聖; Belle Collaboration*; 他156名*

Physical Review Letters, 115(14), p.142001_1 - 142001_7, 2015/09

AA2015-0747.pdf:0.31MB

 被引用回数:30 パーセンタイル:83.23(Physics, Multidisciplinary)

Using a sample of $$771.6 times 10^6$$ $$Upsilon(4S)$$ decays collected by the Belle experiment at the KEKB $$e^+e^-$$ collider, we observe, for the first time, the transition $$Upsilon(4S) to eta h_b(1P)$$ with the branching fraction $${cal B}[Upsilon(4S) to eta h_b(1P)] = (2.18 pm 0.11 pm 0.18) times 10^{-3}$$ and we measure the $$h_b(1P)$$ mass $$M_{h_b(1P)}=(9899.3 pm 0.4 pm 1.0)$$ MeV/$$c^2$$, corresponding to the hyperfine (HF) splitting $$Delta M_{rm HF}(1P) = (0.6 pm 0.4 pm 1.0)$$ MeV/$$c^2$$.Using the transition $$h_b(1P) to gamma eta_b(1S)$$, we measure the $$eta_b(1S)$$ mass $$M_{eta_b(1S)}=(9400.7 pm 1.7 pm 1.6)$$ MeV/$$c^2$$, corresponding to $$Delta M_{rm HF}(1S) = (59.6 pm 1.7 pm 1.6)$$ MeV/$$c^2$$, the $$eta_b(1S)$$ width $$Gamma_{eta_b(1S)} = (8^{+6}_{-5} pm 5)$$ MeV/$$c^2$$ and the branching fraction $${cal B}[h_b(1P) to gamma eta_b(1S)] = (56 pm 8 pm 4)%$$.

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