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論文

Study of $$e^+e^-to Upsilon(rm1S,2S)eta$$ and $$e^+e^-to Upsilon(rm 1S)eta^{prime}$$ at $$sqrt{s}=10.866$$ GeV with the Belle detector

Kovalenko, E.*; 谷田 聖; Belle Collaboration*; 他181名*

Physical Review D, 104(11), p.112006_1 - 112006_12, 2021/12

https://doi.org/10.1103/PhysRevD.104.112006
 被引用回数：0 パーセンタイル：0.01(Astronomy & Astrophysics)

We report the first observation of the processes $$e^+e^-toUpsilon(rm 1S,2S)eta$$ at $$sqrt{s}$$=10.866 GeV with a $$10.2sigma$$ and $$16.5sigma$$ significance respectively. The measured Born cross sections are $$sigma(e^+e^- to Upsilon(2S)eta)=2.07 pm 0.21 pm 0.19$$ pb, and $$sigma(e^+e^- to Upsilon(rm 1S)eta)=0.42 pm 0.08 pm 0.04$$ pb. We also set the upper limit on the cross section of the process $$e^+e^- to Upsilon(rm 1S)eta^{prime}$$ to be $$sigma(e^+e^- to Upsilon(rm 1S)eta^{prime}) < 0.035$$~pb at $$90%$$ CL. The results are obtained with the data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider in the energy range from 10.63 GeV to 11.02 GeV.

論文

Search for lepton-flavor-violating tau-lepton decays to $$ellgamma$$ at Belle

宇野 健太*; 谷田 聖; Belle Collaboration*; 他181名*

Journal of High Energy Physics (Internet), 2021(10), p.19_1 - 19_12, 2021/10

https://doi.org/10.1007/JHEP10(2021)019
 被引用回数：9 パーセンタイル：65.5(Physics, Particles & Fields)

Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays $$tau^{pm}rightarrowell^{pm}gamma$$ ($$ell=e,mu$$) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via $$tau^{pm}rightarrowell^{pm}gamma$$ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb$$^{-1}$$, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, $$mathcal{B}(tau^{pm}rightarrow mu^{pm}gamma)$$ $$leq$$ $$4.2times10^{-8}$$ and $$mathcal{B}(tau^{pm}rightarrow e^{pm}gamma)$$ $$leq$$ $$5.6times10^{-8}$$, are set at 90% confidence level.

論文

Dalitz analysis of $$D^{0}to K^{-}pi^{+}eta$$ decays at Belle

Chen, Y. Q.*; 谷田 聖; Belle Collaboration*; 他181名*

Physical Review D, 102(1), p.012002_1 - 012002_12, 2020/07

https://doi.org/10.1103/PhysRevD.102.012002
 被引用回数：11 パーセンタイル：62.17(Astronomy & Astrophysics)

We present the results of the first Dalitz plot analysis of the decay $$D^{0}to K^{-}pi^{+}eta$$. The analysis is performed on a data set corresponding to an integrated luminosity of 953 $$rm{fb}^{-1}$$ collected by the Belle detector at the asymmetric-energy $$e^{+}e^{-}$$ KEKB collider. The Dalitz plot is well described by a combination of the six resonant decay channels $$bar{K}^{*}(892)^0eta$$, $$K^{-}a_0(980)^+$$, $$K^{-}a_2(1320)^+$$, $$bar{K}^{*}(1410)^0eta$$, $$K^{*}(1680)^-pi^{+}$$ and $$K_2^{*}(1980)^-pi^{+}$$, together with $$Kpi$$ and $$Keta$$ S-wave components. The decays $$K^{*}(1680)^{-}to K^{-}eta$$ and $$K_{2}^{*}(1980)^{-}to K^{-}eta$$ are observed for the first time. We measure ratio of the branching fractions, $$frac{mathcal{B}(D^{0}to K^{-}pi^{+}eta)}{mathcal{B}(D^{0}to K^{-}pi^{+})}$$ =0.500 $$pm 0.002 {rm(stat)} pm0.020 {rm(syst)}pm 0.003 {rm (mathcal{B}_{PDG})}$$. Using the Dalitz fit result, the ratio $$frac{mathcal{B}(K^{*}(1680) to K eta)}{mathcal{B}(K^{*}(1680)to Kpi)}$$ is measured to be $$0.11 pm 0.02 {rm(stat)}^{+0.06}_{-0.04}{rm(syst)} pm 0.04{rm(mathcal{B}_{{PDG}})}$$; this is much lower than the theoretical expectations ($$approx 1$$) made under the assumption that $$K^{*}(1680)$$ is a pure $$1^{3}D_1$$ state. The product branching fraction $$mathcal{B}(D^0 to [K_2^{*}(1980)^- to K^{-} eta] pi^{+}) = (2.2^{+1.7}_{-1.9})times10^{-4}$$ is determined. In addition, the $$pieta^{prime}$$ contribution to the $$a_0(980)^{pm}$$ resonance shape is confirmed with 10.1$$sigma$$ statistical significance using the three-channel Flatte model. We also measure $$mathcal{B}(D^0tobar{K}^{*}(892)^0eta)=(1.41^{+0.13}_{-0.12})%$$. This is consistent with, and more precise than, the current world average $$(1.02pm0.30)%$$, deviates with a significance of more than $$3sigma$$ from the theoretical predictions of (0.51-0.92)%.

論文

Observation of a new structure near 10.75 GeV in the energy dependence of the $$e^{+}$$e$$^{-} to Upsilon(nS) pi^{+}pi^{-}$$ $$(n = 1, 2, 3)$$ cross sections

Mizuk, R.*; 谷田 聖; Belle Collaboration*; 他181名*

Journal of High Energy Physics (Internet), 2019(10), p.220_1 - 220_26, 2019/10

https://doi.org/10.1007/JHEP10(2019)220
 被引用回数：30 パーセンタイル：83.18(Physics, Particles & Fields)

We report a new measurement of the $$e^+e^-toUpsilon(nS)pi^+pi^-$$ ($$n=1,2,3$$) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. We observe a new structure in the energy dependence of the cross sections; if described by a Breit-Wigner function its mass and width are found to be $$M=(10752.7pm5.9,^{+0.7}_{-1.1}),$$MeV/$$c^2$$ and $$Gamma=(35.5^{+17.6}_{-11.3},^{+3.9}_{-3.3}),$$MeV, where the first error is statistical and the second is systematic. The global significance of the new structure that includes a systematic uncertainty is 6.7 standard deviations. We also find evidence for the $$e^+e^-toUpsilon(1S)pi^+pi^-$$ process at the energy 10.52 GeV, which is below the $$Bbar{B}$$ threshold.

論文

Search for $$Upsilon(1S,2S) to Z^{+}_{c}Z^{(prime) -}_{c}$$ and $$e^{+}e^{-} to Z^{+}_{c}Z^{(prime) -}_{c}$$ at $$sqrt{s}$$ = 10.52, 10.58, and 10.867 GeV

Jia, S.*; 谷田 聖; Belle Collaboration*; 他181名*

Physical Review D, 97(11), p.112004_1 - 112004_16, 2018/06

AA2018-0586.pdf:1.67MB

https://doi.org/10.1103/PhysRevD.97.112004
 被引用回数：2 パーセンタイル：12.9(Astronomy & Astrophysics)

The first search for $$Z_{c}$$ pair production in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays and in $$e^{+}e^{-}$$ annihilation at $$sqrt{s}$$ = 10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays ($${cal B}(Upsilon(1S,2S)to Z^{+}_{c}Z^{(prime) -}_{c})times{cal B}(Z^{+}_{c}topi^{+}+cbar c)$$ ($$cbar c=J/psi$$, $$chi_{c1}(1P)$$, $$psi(2S)$$)) and the product of Born cross section and branching fraction for $$e^{+}e^{-} to Z^{+}_{c}Z^{(prime) -}_{c}$$ ($$sigma(e^+e^- to Z^{+}_{c}Z^{(prime) -}_{c})times {cal B}(Z^{+}_{c} to pi^+ +cbar c)$$) at $$sqrt{s}$$ = 10.52, 10.58, and 10.867 GeV are determined. Here, $$Z_{c}$$ refers to the $$Z_{c}(3900)$$ and $$Z_{c}(4200)$$ observed in the $$pi J/psi$$ final state, the $$Z_{c1}(4050)$$ and $$Z_{c2}(4250)$$ in the $$pichi_{c1}(1P)$$ state, and the $$Z_{c}(4050)$$ and $$Z_{c}(4430)$$ in the $$pipsi(2S)$$ state.

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