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論文

Towards $$CP$$-violation studies on superheavy molecules; Theoretical and experimental perspectives

Mitra, R.*; Prasannaa, V. S.*; Garcia Ruiz, R. F.*; 佐藤 哲也; 阿部 穣里*; 酒見 泰寛*; Das, B. P.*; Sahoo, B. K.*

Physical Review A, 104(6), p.062801_1 - 062801_9, 2021/12

https://doi.org/10.1103/PhysRevA.104.062801
 被引用回数：2 パーセンタイル：24.82(Optics)

ローレンシウムを含む二原子分子における電子電気双極子モーメント(eEDM)および核-電子スカラー-擬スカラー相互作用の理論的研究をおこなった。$$CP$$反転に対する感度をさまざまな中性およびイオン分子について調べたところ、これらの系の実効電場が、eEDM実験が行われている他の既知の分子よりも約3$$sim$$4倍大きいことがわかった。同様に、これらの超重元素分子は、$$CP$$に違反するスカラー-擬スカラー核-電子相互作用に対して3倍以上の増強を示す。Woods-Saxon核モデルを用いて検討した結果、これらがLr核内の拡散表面相互作用に敏感であることが示唆された。

論文

Measurements of isospin asymmetry and difference of direct $$CP$$ asymmetries in inclusive $$B to X_s gamma$$ decays

綿貫 峻*; 谷田 聖; Belle Collaboration*; 他175名*

Physical Review D, 99(3), p.032012_1 - 032012_13, 2019/02

AA2019-0536.pdf:0.41MB

https://doi.org/10.1103/PhysRevD.99.032012
 被引用回数：13 パーセンタイル：60.85(Astronomy & Astrophysics)

We report measurements of isospin asymmetry $$Delta_{0-}$$ and difference of direct $$CP$$ asymmetries $$Delta A_{CP}$$ between charged and neutral $$B to X_s gamma$$ decays. This analysis is based on the data sample containing $$772 times 10^6 Bbar{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $$e^+ e^-$$ collider. Using a sum-of-exclusive technique with invariant $$X_s$$ mass up to 2.8 GeV/$$c^2$$, we obtain $$Delta_{0-} = bigl[-0.48 pm 1.49 {rm (stat.)} pm 0.97 {rm (syst.)} pm 1.15 {(f_{+-}/f_{00})}bigr]$$% and $$Delta A_{CP} = bigl[+3.69 pm 2.65 {rm (stat.)} pm 0.76{rm (syst.)}bigr]$$%, where the last uncertainty for $$Delta_{0-}$$ is due to the uncertainty on the production ratio of $$B^+B^-$$ to $$B^0bar{B}^0$$ in $$Upsilon(4S)$$ decays. The measured value of $$Delta_{0-}$$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $$B to X_s gamma$$, and improve the branching fraction prediction. The result for $$Delta A_{CP}$$ is consistent with the prediction of the SM. We also measure the direct $$CP$$ asymmetries for charged and neutral $$B to X_s gamma$$ decays. All the measurements are the most precise to date.

論文

Measurement of time-dependent $$CP$$ violation in $$B^0 to K^0_S pi^0 pi^0$$ decays

遊佐 洋右*; 谷田 聖; Belle Collaboration*; 他159名*

Physical Review D, 99(1), p.011102_1 - 011102_7, 2019/01

AA2019-0530.pdf:0.33MB

https://doi.org/10.1103/PhysRevD.99.011102
 被引用回数：2 パーセンタイル：13.91(Astronomy & Astrophysics)

We report a measurement of time-dependent $$CP$$ violation in $$B^0 to K^0_S pi^0 pi^0$$ decays using a data sample of $$772 times 10^6$$ $$Bbar{B}$$ pairs collected by the Belle experiment running at the $$Upsilon (4S)$$ resonance at the KEKB $$e^+ e^-$$ collider. This decay proceeds mainly via a $$bto sdbar{d}$$ "penguin" amplitude. The results are $$sin 2phi^{rm eff}_1 = 0.92^{+0.27}_{-0.31}~$$ (stat.) $$pm 0.11$$ (syst.) and $$mathcal{A} = 0.28 pm 0.21$$ (stat.) $$pm 0.04$$ (syst.), which are the most precise measurements of $$CP$$ violation in this decay mode to date. The value for the $$CP$$-violating parameter $$sin 2phi^{rm eff}_1$$ is consistent with that obtained using decay modes proceeding via a $$bto cbar{c}s$$ "tree" amplitude.

論文

First evidence for cos 2$$beta >$$ 0 and resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle ambiguity

足立 一郎*; 谷田 聖; Belle Collaboration*; 他421名*

Physical Review Letters, 121(26), p.261801_1 - 261801_11, 2018/12

AA2018-0657.pdf:0.85MB

https://doi.org/10.1103/PhysRevLett.121.261801
 被引用回数：9 パーセンタイル：57.38(Physics, Multidisciplinary)

We present first evidence that the cosine of the $$CP$$-violating weak phase $$2beta$$ is positive, and hence exclude trigonometric multifold solutions of the CKM Unitarity Triangle using a time-dependent Dalitz plot analysis of $$B^{0} to D^{(*)} h^{0}$$ with $$D to K_{S}^{0} pi^{+} pi^{-}$$ decays, where $$h^{0} in {pi^{0}, eta, omega }$$ denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BaBar and Belle experiments collected at the $$Upsilon(4S)$$ resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain $$( 471 pm 3 )times 10^6, Bbar{B}$$ pairs recorded by the BaBar detector and $$(772 pm 11)times 10^6, Bbar{B}$$ pairs recorded by the Belle detector. The results of the measurement are $$sin{2beta} = 0.80 pm 0.14 ,(rm{stat.}) pm 0.06 ,(rm{syst.}) pm 0.03 ,(rm{model})$$ and $$cos{2beta} = 0.91 pm 0.22 ,(rm{stat.}) pm 0.09 ,(rm{syst.}) pm 0.07 ,(rm{model})$$. The result for the direct measurement of the angle $$beta$$ of the CKM Unitarity Triangle is $$beta = left( 22.5 pm 4.4 ,(rm{stat.}) pm 1.2 ,(rm{syst.}) pm 0.6 ,(rm{model}) right)^{circ}$$. The quoted model uncertainties are due to the composition of the $$D^{0} to K_{S}^{0} pi^{+} pi^{-}$$ decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics $$e^{+}e^{-} to cbar{c}$$ data sample. CP violation is observed in $$B^{0} to D^{(*)} h^{0}$$ decays at the level of $$5.1$$ standard deviations. The significance for $$cos{2beta} > 0$$ is $$3.7$$ standard deviations. The trigonometric multifold solution $$pi/2 - beta = (68.1 pm 0.7)^{circ}$$ is excluded at the level of $$7.3$$ standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.

論文

Measurement of $$cos{2beta}$$ in $$B^{0} to D^{(*)} h^{0}$$ with $$D to K_{S}^{0} pi^{+} pi^{-}$$ decays by a combined time-dependent Dalitz plot analysis of $$B_{A}B_{AR}$$ and Belle data

足立 一郎*; 谷田 聖; Belle Collaboration*; 他406名*

Physical Review D, 98(11), p.112012_1 - 112012_29, 2018/11

AA2018-0713.pdf:4.08MB

https://doi.org/10.1103/PhysRevD.98.112012
 被引用回数：16 パーセンタイル：63.66(Astronomy & Astrophysics)

We report measurements of $$sin{2beta}$$ and $$cos{2beta}$$ from a time-dependent Dalitz plot analysis of $$B^{0} to D^{(*)} h^{0}$$ with $$D to K_{S}^{0} pi^{+} pi^{-}$$ decays, where the light unflavored and neutral hadron $$h^{0}$$ is a $$pi^{0}$$, $$eta$$, or $$omega$$ meson. The analysis is performed with a combination of the final data sets of the BABAR and Belle experiments containing $$471 times 10^{6}$$ and $$772 times 10^{6}$$ $$Bbar{B}$$ pairs collected at the $$Upsilonleft(4Sright)$$ resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure $$sin{2beta} = 0.80 pm 0.14 ,(rm{stat.}) pm 0.06 ,(rm{syst.}) pm 0.03 ,(rm{model})$$ and $$cos{2beta} = 0.91 pm 0.22 ,(rm{stat.}) pm 0.09 ,(rm{syst.}) pm 0.07 ,(rm{model})$$. The result for the direct measurement of the angle is $$beta = left( 22.5 pm 4.4 ,(rm{stat.}) pm 1.2 ,(rm{syst.}) pm 0.6 ,(rm{model}) right)^{circ}$$. The last quoted uncertainties are due to the composition of the $$D^{0} to K_{S}^{0} pi^{+} pi^{-}$$ decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics $$e^{+}e^{-} to cbar{c}$$ data sample as part of this analysis. We find the first evidence for $$cos2beta>0$$ at the level of $$3.7$$ standard deviations. The measurement excludes the trigonometric multifold solution $$pi/2 - beta = (68.1 pm 0.7)^{circ}$$ at the level of $$7.3$$ standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of $$beta = 0^{circ}$$ is ruled out at the level of $$5.1$$ standard deviations, and thus $$CP$$ violation is observed in $$B^{0} to D^{(*)} h^{0}$$ decays.

論文

Measurement of time-dependent $$CP$$ asymmetries in $$B^{0}to K_S^0 eta gamma$$ decays

中野 浩至*; 谷田 聖; Belle Collaboration*; 他188名*

Physical Review D, 97(9), p.092003_1 - 092003_10, 2018/05

AA2018-0584.pdf:0.54MB

https://doi.org/10.1103/PhysRevD.97.092003
 被引用回数：7 パーセンタイル：37.62(Astronomy & Astrophysics)

We report a measurement of time-dependent $$CP$$ violation parameters in $${B^0 to K_S^0 eta gamma}$$ decays. The study is based on a data sample, containing $${772 times 10^6 Bbar{B}}$$ pairs, that was collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. We obtain the $$CP$$ violation parameters of $${{cal S} = -1.32 pm 0.77 {rm (stat.)} pm 0.36{rm (syst.)}}$$ and $${{cal A} = -0.48 pm 0.41 {rm (stat.)} pm 0.07{rm (syst.)}}$$ for the invariant mass of the $$K_S^0 eta$$ system up to 2.1 GeV/$$c^2$$.

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.

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