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論文

Measurements of the branching fractions of the semileptonic decays $$Xi_{c}^{0} to Xi^{-} ell^{+} nu_{ell}$$ and the asymmetry parameter of $$Xi_{c}^{0} to Xi^{-} pi^{+}$$

Li, Y. B.*; 谷田 聖; Belle Collaboration*; 他182名*

Physical Review Letters, 127(12), p.121803_1 - 121803_8, 2021/09

https://doi.org/10.1103/PhysRevLett.127.121803
 被引用回数：26 パーセンタイル：91.72(Physics, Multidisciplinary)

Using data samples of 89.5 and 711 fb$$^{-1}$$ recorded at energies of $$sqrt{s}=10.52$$ and $$10.58$$ GeV, respectively, with the Belle detector at the KEKB $$e^+e^-$$ collider, we report measurements of branching fractions of semileptonic decays $$Xi_{c}^{0} to Xi^{-} ell^{+} nu_{ell}$$ ($$ell=e$$ or $$mu$$) and the $$CP$$-asymmetry parameter of $$Xi_{c}^{0} to Xi^{-} pi^{+}$$ decay. The branching fractions are measured to be $${cal B}(Xi_{c}^{0} to Xi^{-} e^{+} nu_{e}$$)=($$1.31 pm 0.04 pm 0.07 pm 0.38$$)% and $${cal B}(Xi_{c}^{0} to Xi^{-} mu^{+} nu_{mu}$$)=($$1.27 pm 0.06 pm 0.10 pm 0.37$$)%, and the decay parameter $$alpha_{Xipi}$$ is measured to be $$0.63 pm 0.03 pm 0.01$$ with much improved precision compared to the current world average. The corresponding ratio $${cal B}(Xi_{c}^{0} to Xi^{-} e^{+} nu_{e})$$/$${cal B}(Xi_{c}^{0} to Xi^{-} mu^{+} nu_{mu})$$ is 1.03 $$pm$$ 0.05 $$pm$$ 0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter $${cal A}_{CP} = (alpha_{Xi^{-}pi^{+}} + alpha_{bar{Xi}^{+}pi^{-}})/(alpha_{Xi^{-}pi^{+}} - alpha_{bar{Xi}^{+}pi^{-}}) = 0.024 pm 0.052 pm 0.014$$ is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the $$Xi_{c}^{0} to Xi^{-} pi^+$$ branching fraction.

論文

Search for $$CP$$ violation with kinematic asymmetries in the $$D^0 to K^+ K^- pi^+ pi^-$$ decay

Kim, J. B.*; 谷田 聖; Belle Collaboration*; 他182名*

Physical Review D, 99(1), p.011104_1 - 011104_7, 2019/01

AA2019-0534.pdf:0.39MB

https://doi.org/10.1103/PhysRevD.99.011104
 被引用回数：4 パーセンタイル：26.14(Astronomy & Astrophysics)

We search for $$CP$$ violation in the singly-Cabibbo-suppressed decay $$D^{0}rightarrow K^{+}K^{-}pi^{+}pi^{-}$$ using data corresponding to an integrated luminosity of 988 fb$$^{-1}$$ collected by the Belle detector at the KEKB $$e^{+}e^{-}$$ collider. We measure a set of five kinematically dependent $$CP$$ asymmetries, of which four asymmetries are measured for the first time. The set of asymmetry measurements can be sensitive to $$CP$$ violation via interference between the different partial-wave contributions to the decay and performed on other pseudoscalar decays. We find no evidence of $$CP$$ violation.

論文

Measurement of the $$tau$$ lepton polarization and $$R(D^*)$$ in the decay $$bar{B} rightarrow D^* tau^- bar{nu}_tau$$ with one-prong hadronic $$tau$$ decays at Belle

廣瀬 茂輝*; 谷田 聖; Belle Collaboration*; 他182名*

Physical Review D, 97(1), p.012004_1 - 012004_17, 2018/01

AA2018-0508.pdf:1.3MB

https://doi.org/10.1103/PhysRevD.97.012004
 被引用回数：127 パーセンタイル：99.04(Astronomy & Astrophysics)

With the full data sample of $$772 times 10^6$$ $$B{bar B}$$ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay $$bar{B} rightarrow D^* tau^- bar{nu}_tau$$ is studied with the hadronic $$tau$$ decays $$tau^- rightarrow pi^- nu_tau$$ and $$tau^- rightarrow rho^- nu_tau$$. The $$tau$$ polarization $$P_tau(D^*)$$ in two-body hadronic $$tau$$ decays is measured, as well as the ratio of the branching fractions $$R(D^{*}) = mathcal{B}(bar {B} rightarrow D^* tau^- bar{nu}_tau) / mathcal{B}(bar{B} rightarrow D^* ell^- bar{nu}_ell)$$, where $$ell^-$$ denotes an electron or a muon. Our results, $$P_tau(D^*) = -0.38 pm 0.51 {rm (stat)} ^{+0.21}_{-0.16} {rm (syst)}$$ and $$R(D^*) = 0.270 pm 0.035{rm (stat)} ^{+0.028}_{-0.025}{rm (syst)}$$, are consistent with the theoretical predictions of the Standard Model. The polarization values of $$P_tau(D^*) > +0.5$$ are excluded at the 90% confidence level.

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