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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

Evidence for isospin violation and measurement of $$CP$$ asymmetries in $$B to K^{ast}(892)gamma$$

堀口 朋裕*; 谷田 聖; Belle Collaboration*; 他191名*

Physical Review Letters, 119(19), p.191802_1 - 191802_8, 2017/11

AA2017-0510.pdf:0.3MB

https://doi.org/10.1103/PhysRevLett.119.191802
 被引用回数：18 パーセンタイル：73.89(Physics, Multidisciplinary)

We report the first evidence for isospin violation in $$B to K^{ast}(892) gamma$$ and the first measurement of the difference of $$CP$$ asymmetries between $$B^+ to K^{ast+} gamma$$ and $$B^0 to K^{ast0} gamma$$. This analysis is based on the data sample containing $$772times10^6$$ $$Bbar{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $$e^+e^-$$ collider. We find evidence for the isospin violation with a significance of $$3.1sigma$$, $$Delta_{0+}=[+6.2 pm 1.5 ({rm stat}) pm 0.6 ({rm syst}) pm 1.2(f_{+-}/f_{00})]%$$, where the third uncertainty is due to the uncertainty on the fraction of $$B^+B^-$$ to $$B^0bar{B}^0$$ production in $$Upsilon(4S)$$ decays. The measured value is consistent with predictions of the standard model. The result for the difference of $$CP$$ asymmetries is $$Delta A_{CP}=[+2.4 pm 2.8 ({rm stat}) pm 0.5 ({rm syst})]%$$, consistent with zero. The measured branching fractions and $$CP$$ asymmetries for charged and neutral $$B$$ meson decays are the most precise to date. We also calculate the ratio of branching fractions of $$B^0 to K^{ast0} gamma$$ to $$B_s^0 to phi gamma$$.

論文

Search for $$CP$$ violation and measurement of the branching fraction in the decay $$D^{0} to K^0_S K^0_S$$

Dash, N.*; 谷田 聖; Belle Collaboration*; 他198名*

Physical Review Letters, 119(17), p.171801_1 - 171801_7, 2017/10

AA2017-0514.pdf:0.35MB

https://doi.org/10.1103/PhysRevLett.119.171801
 被引用回数：36 パーセンタイル：86.73(Physics, Multidisciplinary)

We report a study of the decay $$D^{0} to K^0_S K^0_S$$ using 921 fb$$^{-1}$$ of data collected at or near the $$Upsilon(4S)$$ and $$Upsilon(5S)$$ resonances with the Belle detector at the KEKB asymmetric energy $$e^+e^-$$ collider. The measured time-integrated $$CP$$ asymmetry is $$A_{CP}(D^{0} to K^0_S K^0_S)=(-0.02 pm 1.53 pm 0.02 pm 0.17)%$$, and the branching fraction is $$B(D^{0} to K^0_S K^0_S)=(1.321 pm 0.023 pm 0.036 pm 0.044) times 10^{-4}$$, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode ($$D^{0} to K^0_S pi^0$$). These results are significantly more precise than previous measurements available for this mode. The $$A_{CP}$$ measurement is consistent with the standard model expectation.

論文

Measurement of the branching fraction and $$CP$$ asymmetry in $$B^0 to pi^0pi^0$$ decays, and an improved constraint on $$phi_2$$

Julius, T.*; 谷田 聖; Belle Collaboration*; 他184名*

Physical Review D, 96(3), p.032007_1 - 032007_8, 2017/08

AA2017-0467.pdf:0.32MB

https://doi.org/10.1103/PhysRevD.96.032007
 被引用回数：11 パーセンタイル：49.91(Astronomy & Astrophysics)

We measure the branching fraction and $$CP$$-violating asymmetry in the decay $$B^0 to pi^0pi^0$$, using a data sample of $$752 times 10^6$$ $$Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB $$e^+e^-$$ collider. The obtained branching fraction and direct $$CP$$ asymmetry are $$B(B^0 to pi^0pi^0)=[1.31 pm 0.19 ({rm stat.}) pm 0.18 ({rm syst.})]times10^{-6}$$ and $$A_{CP}= 0.14 pm 0.36 ({rm stat.}) pm 0.12 ({rm syst.})$$, respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle's earlier measurements of $$B^0 to pi^0pi^0$$ and $$B^{pm} to pi^{pm}pi^0$$ to exclude the $$CP$$-violating parameter $$phi_2$$ from the range $$15.5^{circ} < phi_2 < 75^{circ}$$ at 95% confidence.

論文

First measurement of $$T$$-odd moments in $$D^0 to K^0_S pi^+pi^-pi^0$$ decays

Prasanth, K.*; 谷田 聖; Belle Collaboration*; 他195名*

Physical Review D, 95(9), p.091101_1 - 091101_8, 2017/05

AA2017-0236.pdf:0.62MB

https://doi.org/10.1103/PhysRevD.95.091101
 被引用回数：8 パーセンタイル：43.8(Astronomy & Astrophysics)

We report the first measurement of the $$T$$-odd moments in the decay $$D^0 to K^0_S pi^+pi^-pi^0$$ from a data sample corresponding to an integrated luminosity of 966 fb$$^{-1}$$ collected by the Belle experiment at the KEKB asymmetric-energy $$e^+e^-$$ collider. From these moments we determine the $$CP$$-violation-sensitive asymmetry $$a_{CP}^{{rm T-odd}}=[-0.28 pm 1.38 ({rm stat.}) ^{+0.23}_{-0.76}({rm syst.})] times 10^{-3}$$, which is consistent with no CP violation. In addition, we perform $$a_{CP}^{{rm T-odd}}$$ measurements in different regions of the $$D^0 to K^0_S pi^+pi^-pi^0$$ phase space; these are also consistent with no CP violation.

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