検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年
検索結果: 5 件中 1件目~5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

Measurement of branching fraction and search for $$CP$$ violation in $$Bto phi phi K$$

Mohanty, S.*; 谷田 聖; Belle Collaboration*; 他184名*

Physical Review D, 103(5), p.052013_1 - 052013_9, 2021/03

 被引用回数:0 パーセンタイル:0.00(Astronomy & Astrophysics)

We report the measurement of branching fractions and $$CP$$-violation asymmetries in $$Bto phi phi K$$ decays based on a $$711,{rm fb}^{-1}$$ data sample containing $$772times 10^6$$ $$Bbar{B}$$ events. The data were recorded at the $$Upsilon (4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. For $$B^+ to phi phi K^+$$, the branching fraction and $$CP$$-violation asymmetry measured below the $$eta_{c}$$ threshold ($$m_{phiphi} < 2.85,{rm GeV}/c^2$$) are $$[3.43^{,+,0.48}_{,-,0.46}({rm stat})pm 0.22({rm syst})] times10^{-6}$$ and $$-0.02pm0.11({rm stat})pm0.01({rm syst})$$, respectively. Similarly, the branching fraction obtained for $$B^0 tophiphi K^0$$ below the $$eta_{c}$$ threshold is $$[3.02^{,+,0.75}_{,-,0.66} ({rm stat})pm ,0.20({rm syst})]times10^{-6}$$. We also measure the $$CP$$-violation asymmetry for $$B^+ tophiphi K^+$$ within the $$eta_{c}$$ region ($$m_{phiphi}in [2.94,3.02],{rm GeV}/c^2$$) to be $$+0.12pm0.12({rm stat})pm0.01({rm syst})$$.

論文

Observation of Coulomb-assisted nuclear bound state of $$Xi^-$$-$$^{14}$$N system

早川 修平; 藤田 真奈美; 長谷川 勝一; 橋本 直; 細見 健二; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.

Physical Review Letters, 126(6), p.062501_1 - 062501_6, 2021/02

 被引用回数:41 パーセンタイル:94.79(Physics, Multidisciplinary)

In an emulsion-counter hybrid experiment performed at J-PARC, a $$Xi^-$$ absorption event was observed which decayed into twin single-$$Lambda$$ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as $$Xi^{-} + ^{14}$$N$$ rightarrow ^{10}_Lambda$$Be + $$^5_Lambda$$He. For the binding energy of the $$Xi^{-}$$ hyperon in the $$Xi^-$$-$$^{14}$$N system a value of $$1.27 pm 0.21$$ MeV was deduced. The energy level of $$Xi^-$$ is likely a nuclear $$1p$$ state which indicates a weak $${Xi}N$$-$$LambdaLambda$$ coupling.

論文

Prominence of pairing in inclusive ($$p,2p$$) and ($$p,pn$$) cross sections from neutron-rich nuclei

Paul, N.*; Obertelli, A.*; Bertulani, C. A.*; Corsi, A.*; Doornenbal, P.*; Rodriguez-Sanchez, J. L.*; Authelet, G.*; Orlandi, R.; 他84名*

Physical Review Letters, 122(16), p.162503_1 - 162503_7, 2019/04

 被引用回数:7 パーセンタイル:49.42(Physics, Multidisciplinary)

Fifty-five single nucleon removal cross sections from neutron-rich nuclei impinging on a hydrogen target at about 250 MeV/nucleon were measured at the RIKEN RIBF. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons compared to odd-proton number projectiles for the same separation energy, while no even-odd staggering was observed in case of neutron-removal. These observations are linked to paring correlations in the daughter nuclei and the density of bound levels. The effect is particularly strong in loosely bound nuclei.

論文

Observation of $$Xi(1620)^0$$ and evidence for $$Xi(1690)^0$$ in $$Xi_c^+ rightarrow Xi^-pi^+pi^+$$ decays

住浜 水季*; 谷田 聖; Belle Collaboration*; 他184名*

Physical Review Letters, 122(7), p.072501_1 - 072501_7, 2019/02

AA2019-0535.pdf:0.37MB

 被引用回数:29 パーセンタイル:83.57(Physics, Multidisciplinary)

We report the first observation of the doubly-strange baryon $$Xi(1620)^0$$ in its decay to $$Xi^-pi^+$$ via $$Xi_c^+ rightarrow Xi^- pi^+ pi^+$$ decays based on a $$980,{rm fb}^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. The mass and width are measured to be 1610.4 $$pm$$ 6.0 (stat) $$^{+5.9}_{-3.5}$$ (syst) MeV$$/c^2$$ and 59.9 $$pm$$ 4.8 (stat) $$^{+2.8}_{-3.0}$$ (syst) MeV, respectively. We obtain 4.0$$sigma$$ evidence of the $$Xi(1690)^0$$ with the same data sample. These results shed light on the structure of hyperon resonances with strangeness $$S=-2$$.

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

 被引用回数:11 パーセンタイル:47.83(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.

5 件中 1件目~5件目を表示
  • 1