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論文

Search for the decay $$B_s^0 rightarrow eta^prime eta$$

Nisar, N. K.*; 谷田 聖; Belle Collaboration*; 他197名*

Physical Review D, 104(3), p.L031101_1 - L031101_8, 2021/08

https://doi.org/10.1103/PhysRevD.104.L031101
 被引用回数：1 パーセンタイル：10.54(Astronomy & Astrophysics)

We report the results of the first search for the decay $$B_s^0 rightarrow eta^prime eta$$ using $$121.4~textrm{fb}^{-1}$$ of data collected at the $$Upsilon(5S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. We observe no significant signal and set a 90% confidence-level upper limit of $$6.5 times 10^{-5}$$ on the branching fraction of this decay.

論文

Measurements of branching fraction and direct $$CP$$ asymmetry in $$B^{pm}to K^{0}_{S}K^{0}_{S}K^{pm}$$ and a search for $$B^{pm}to K^{0}_{S}K^{0}_{S}pi^{pm}$$

Kaliyar, A. B.*; 谷田 聖; Belle Collaboration*; 他197名*

Physical Review D, 99(3), p.031102_1 - 031102_9, 2019/02

AA2019-0538.pdf:0.36MB

https://doi.org/10.1103/PhysRevD.99.031102
 被引用回数：2 パーセンタイル：13.91(Astronomy & Astrophysics)

We study charmless hadronic decays of charged $$B$$ mesons to the final states $$K^{0}_{S}K^{0}_{S}K^{pm}$$ and $$K^{0}_{S}K^{0}_{S}pi^{pm}$$ using a $$711 fb^{-1}$$ data sample that contains $$772times 10^6$$ $$Bbar{B}$$ pairs, and was collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider. For $$B^{pm}to K^{0}_{S}K^{0}_{S}K^{pm}$$, the measured branching fraction and direct $$CP$$ asymmetry are $$[10.42pm0.43(stat)pm 0.22(syst)]times10^{-6}$$ and [$$+1.6pm3.9(stat)pm 0.9(syst)$$]%, respectively. In the absence of a statistically significant signal for $$B^{pm}to K^{0}_{S}K^{0}_{S}pi^{pm}$$, we obtain a 90% confidence-level upper limit on its branching fraction as $$8.7 times10^{-7}$$.

論文

Measurement of the decays $$Lambda_cto Sigmapipi$$ at Belle

Berger, M.*; 谷田 聖; Belle Collaboration*; 他197名*

Physical Review D, 98(11), p.112006_1 - 112006_10, 2018/12

AA2018-0765.pdf:0.74MB

https://doi.org/10.1103/PhysRevD.98.112006
 被引用回数：5 パーセンタイル：28.36(Astronomy & Astrophysics)

We report measurements of the branching fractions of the decays $$Lambda^+_ctoSigma^+pi^-pi^+$$, $$Lambda^+_ctoSigma^0pi^+pi^0$$ and $$Lambda^+_ctoSigma^+pi^0pi^0$$ relative to the reference channel $$Lambda^+_cto pK^-pi^+$$. The analysis is based on the full data sample collected at and close to $$Upsilon(4S)$$ resonance by the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider corresponding to the integrated luminosity of 711 fb$$^{-1}$$. We measure $${cal B}(Lambda^+_crightarrowSigma^+pi^-pi^+)/{cal B}(Lambda^+_cto pK^-pi^+) = 0.706~pm 0.003~pm 0.029$$, $${cal B}(Lambda^+_crightarrowSigma^0pi^+pi^0)/{cal B}(Lambda^+_cto pK^-pi^+) = 0.491~pm 0.005~pm 0.028$$ and $${cal B}(Lambda^+_crightarrowSigma^+pi^0pi^0)/{cal B}(Lambda^+_cto pK^-pi^+) = 0.198~pm 0.006~pm 0.016$$. The listed uncertainties are statistical and systematic, respectively.

論文

Observation of $$Upsilon(2S)togamma eta_{b}(1S)$$ decay

Fulsom, B. G.*; 谷田 聖; Belle Collaboration*; 他197名*

Physical Review Letters, 121(23), p.232001_1 - 232001_8, 2018/12

AA2018-0717.pdf:0.36MB

https://doi.org/10.1103/PhysRevLett.121.232001
 被引用回数：5 パーセンタイル：41.65(Physics, Multidisciplinary)

We report the observation of $$Upsilon(2S)togammaeta_{b}(1S)$$ decay based on analysis of the inclusive photon spectrum of $$24.7$$ fb$$^{-1}$$ of $$e^+ e^-$$ collisions at the $$Upsilon(2S)$$ center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. We measure a branching fraction of $$mathcal{B}(Upsilon(2S)togammaeta_{b}(1S))=(6.1^{+0.6+0.9}_{-0.7-0.5})times 10^{-4}$$, and derive an $$eta_{b}(1S)$$ mass of $$9394.8^{+2.7+4.5}_{-3.1-2.7}$$ MeV/$$c^{2}$$, where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.

論文

Search for $$CP$$ violation in the $$D^{+}topi^{+}pi^{0}$$ decay at Belle

Babu, V.*; 谷田 聖; Belle Collaboration*; 他197名*

Physical Review D, 97(1), p.011101_1 - 011101_8, 2018/01

AA2018-0582.pdf:0.52MB

https://doi.org/10.1103/PhysRevD.97.011101
 被引用回数：10 パーセンタイル：48.48(Astronomy & Astrophysics)

We search for $$CP$$ violation in the charged charm meson decay $$D^{+}topi^{+}pi^{0}$$, based on a data sample corresponding to an integrated luminosity of $$rm 921~fb^{-1}$$ collected by the Belle experiment at the KEKB $$e^{+}e^{-}$$ asymmetric-energy collider. The measured $$CP$$ violating asymmetry is $$[+2.31pm1.24({rm stat})pm0.23({rm syst})]%$$, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results.

論文

Inclusive and exclusive measurements of $$B$$ decays to $$chi_{c1}$$ and $$chi_{c2}$$ at Belle

Bhardwaj, V.*; 谷田 聖; Belle Collaboration*; 他197名*

Physical Review D, 93(5), p.052016_1 - 052016_13, 2016/03

AA2016-0389.pdf:0.59MB

https://doi.org/10.1103/PhysRevD.93.052016
 被引用回数：20 パーセンタイル：66.92(Astronomy & Astrophysics)

We report inclusive and exclusive measurements for $$chi_{c1}$$ and $$chi_{c2}$$ production in $$B$$ decays. We measure $${cal B}(Bto chi_{c1}X)= (3.03pm0.05({rm stat})pm 0.24({rm syst}))times 10^{-3}$$ and $${cal B}(Bto chi_{c2}X)= (0.70 pm 0.06({rm stat}) pm 0.10({rm syst}))times 10^{-3}$$. For the first time, $$chi_{c2}$$ production in exclusive $$B$$ decays in the modes $$B^0 to chi_{c2}pi^-K^+$$ and $$B^+ to chi_{c2}pi^+pi^-K^+$$ has been observed, along with first evidence for the $$B^+ to chi_{c2}pi^+ K_S^0$$ decay mode. For $$chi_{c1}$$ production, we report the first observation in the $$B^+ to chi_{c1}pi^+pi^-K^+$$, $$B^0 to chi_{c1}pi^+pi^-K^0_S$$ and $$B^0 to chi_{c1}pi^0pi^-K^+$$ decay modes. Using these decay modes, we observe a difference in the production mechanism of $$chi_{c2}$$ in comparison to $$chi_{c1}$$ in $$B$$ decays. In addition, we report searches for $$X(3872)$$ and $$chi_{c1}(2P)$$ in the $$B^+ to (chi_{c1}pi^+pi^-)K^+$$ decay mode. The reported results use $$772 times 10^6$$ $$Bbar{B}$$ events collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider.

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