JAEA
  • help
  • PC | SP
  • JP | EN
          
検索対象：     
報告書番号：
※ 半角英数字
 年 ～ 
 年
全てクリア
検索結果：　2 件中 1件目～2件目を表示
  • 1

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

使用言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

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：60.14(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

Spin-chirality-driven ferroelectricity on a perfect triangular lattice antiferromagnet

三田村 裕幸*; 綿貫 竜太*; 金子 耕士; 小野崎 紀道*; 天羽 祐太*; 橘高 俊一郎*; 小林 理気*; 志村 恭通*; 山本 勲*; 鈴木 和也*; et al.

Physical Review Letters, 113(14), p.147202_1 - 147202_5, 2014/10

https://doi.org/10.1103/PhysRevLett.113.147202
 被引用回数：23 パーセンタイル：75.16(Physics, Multidisciplinary)

Magnetic field ($$B$$) variation of the electrical polarization $$P$$$$_{c}$$ ($${parallel}$$c) of the perfect triangular lattice antiferromagnet RbFe (MoO$$_4$$)$$_2$$ is examined up to the saturation point of the magnetization for B$${perp}c$$. $$P$$$$_{c}$$ is observed only in phases for which chirality is predicted in the in-plane magnetic structures. No strong anomaly is observed in $$P$$$$_{c}$$ at the field at which the spin modulation along the c axis exhibits a discontinuity to the commensurate state. These results indicate that ferroelectricity in this compound originates predominantly from triangular-spin chirality. The obtained field-temperature phase diagrams of ferroelectricity well agree with those theoretically predicted for the spin chirality of a Heisenberg spin triangular lattice antiferromagnet.

2 件中 1件目～2件目を表示
  • 1