M. Watanabe scite author profile

M. Watanabe

5Publications

2,455Citation Statements Received

90Citation Statements Given

How they've been cited

3,692

2,371

How they cite others

871

Affiliations

Niigata University, Tokyo Institute of Technology, Chubu Electric Power (Japan)

Publications

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Measurement of the branching ratio ofB¯→D()τ
Huschle¹,
Kuhr²,
Heck³
et al. 2015
Phys. Rev. D*
690
27
695
2
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We report a measurement of the branching fraction ratios R(D ( * ) ) ofB → D ( * ) τ −ν τ relative tō B → D ( * ) −ν (where = e or µ) using the full Belle data sample of 772 × 10 6 BB pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider. The measured values are R(D) = 0.375 ± 0.064(stat.) ± 0.026(syst.) and R(D * ) = 0.293 ± 0.038(stat.) ± 0.015(syst.). The analysis uses hadronic reconstruction of the tag-side B meson and purely leptonic τ decays. The results are consistent with earlier measurements and do not show a significant deviation from the standard model prediction.

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Measurement of the τ Lepton Polarization and R(D) in the Decay
Hirose¹,
Iijima²,
Adachi³
et al. 2017
Phys. Rev. Lett.*

540

514

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We report the first measurement of the τ lepton polarization P_{τ}(D^{*}) in the decay B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ} as well as a new measurement of the ratio of the branching fractions R(D^{*})=B(B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ})/B(B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ}), where ℓ^{-} denotes an electron or a muon, and the τ is reconstructed in the modes τ^{-}→π^{-}ν_{τ} and τ^{-}→ρ^{-}ν_{τ}. We use the full data sample of 772×10^{6} BB[over ¯] pairs recorded with the Belle detector at the KEKB electron-positron collider. Our results, P_{τ}(D^{*})=-0.38±0.51(stat)_{-0.16}^{+0.21}(syst) and R(D^{*})=0.270±0.035(stat)_{-0.025}^{+0.028}(syst), are consistent with the theoretical predictions of the standard model.

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Study ofe+e−→π+π−J/ψand Observation of a Charged Charmoniumlik

Liu¹,

Shen²,

Yuan³

et al. 2013

Phys. Rev. Lett.

692

391

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The cross section for ee+ e- → π+ π- J/ψ between 3.8 and 5.5 GeV is measured with a 967 fb(-1) data sample collected by the Belle detector at or near the Υ(nS) (n = 1,2,…,5) resonances. The Y(4260) state is observed, and its resonance parameters are determined. In addition, an excess of π+ π- J/ψ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the Y(4008) state that was previously reported by Belle. In a study of Y(4260) → π+ π- J/ψ decays, a structure is observed in the M(π(±)J/ψ) mass spectrum with 5.2σ significance, with mass M = (3894.5 ± 6.6 ± 4.5) MeV/c2 and width Γ = (63 ± 24 ± 26) MeV/c2, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.

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The Belle detector

Abashian

Gotow

Morgan

et al. 2002

Nuclear Instruments and Methods in Physics Research Section A:

1,364

392

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The Physics of the B Factories

et al. 2014

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M. Watanabe

Measurement of the branching ratio ofB¯→D()τ
Huschle¹,
Kuhr²,
Heck³
et al. 2015
Phys. Rev. D*
690
27
695
2
View full text Add to dashboard Cite

Measurement of the τ Lepton Polarization and R(D) in the Decay
Hirose¹,
Iijima²,
Adachi³
et al. 2017
Phys. Rev. Lett.*

Study ofe+e−→π+π−J/ψand Observation of a Charged Charmoniumlik

The Belle detector

The Physics of the B Factories

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M. Watanabe

Measurement of the branching ratio ofB¯→D(*)τHuschle1, Kuhr2, Heck3 et al. 2015Phys. Rev. D690276952View full textAdd to dashboardCite

Measurement of the τ Lepton Polarization and R(D*) in the Decay Hirose1, Iijima2, Adachi3 et al. 2017Phys. Rev. Lett.

Study ofe+e−→π+π−J/ψand Observation of a Charged Charmoniumlik

The Belle detector

The Physics of the B Factories

Contact Info

Product

Resources

About

Measurement of the branching ratio ofB¯→D()τ
Huschle¹,
Kuhr²,
Heck³
et al. 2015
Phys. Rev. D*
690
27
695
2
View full text Add to dashboard Cite

Measurement of the τ Lepton Polarization and R(D) in the Decay
Hirose¹,
Iijima²,
Adachi³
et al. 2017
Phys. Rev. Lett.*