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論文

Characteristic deformation microstructure evolution and deformation mechanisms in face-centered cubic high/medium entropy alloys

吉田周平*; Gong, W.; 他9名*

Acta Materialia, 283, p.120498_1 - 120498_15, 2025/01

https://doi.org/10.1016/j.actamat.2024.120498

被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)

Face-centered cubic (FCC) high/medium entropy alloys (HEAs/MEAs), novel multi-principal element alloys, are known to exhibit exceptional mechanical properties at room temperature; however, the origin is still elusive. Here, we report the deformation microstructure evolutions in a tensile-deformed Co $_{20}$ Cr $_{40}$ Ni $_{40}$ representative MEA and Co $_{60}$ Ni $_{40}$ alloy, a conventional binary alloy for comparison. These FCC alloys have high/low friction stresses, and share similar other material properties. The Co $_{20}$ Cr $_{40}$ Ni $_{40}$ MEA exhibited higher yield strength and work-hardening ability than in the Co $_{60}$ Ni $_{40}$ alloy. Deformation microstructures in the Co $_{20}$ Cr $_{40}$ Ni $_{40}$ alloy were marked by the presence of coarse dislocation cells (DCs) regardless of grain orientation and a few deformation twins (DTs) in grains with the tensile axis (TA) near 1 1 1. In contrast, the MEA developed three distinct deformation microstructures depending on grain orientations: fine DCs in grains with the TA near 1 0 0, planar dislocation structure (PDS) in grains with other orientations, and a high density of DTs along with PDS in grains oriented 1 1 1. These findings demonstrate that FCC HEAs/MEAs with high friction stresses naturally develop unique deformation microstructures which is beneficial for realizing superior mechanical properties compared to conventional materials.

論文

Production cross-sections of residual nuclides from $^{93}$ Zr + at 27 MeV/nucleon

Hwang, J.*; Chillery, T.*; 堂園昌伯*; 今井伸明*; 道正新一郎*; 炭竃聡之*; 千賀信幸*; 大田晋輔*; 中山梓介; 他49名*

Progress of Theoretical and Experimental Physics (Internet), 2024(9), p.093D03_1 - 093D03_12, 2024/09

https://doi.org/10.1093/ptep/ptae139

被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

核変換は高レベル廃棄物の再処理、特に使用済み燃料から $^{93}$ Zrのような長寿命核種を処理するための有望な手段であると考えられている。これらの核種に対する核反応データを蓄積することは、核変換の検討や反応機構を包括的に理解するために不可欠である。本研究では、 $^{93}$ Zrに対する陽子入射反応からの残留核生成断面積を、核子当たり27MeVのエネルギーで逆運動学法を用いて測定した。理研RIBFのOEDOビームラインを用いて、 $^{91-93}$ Nb, $^{91,92}$ Zr, $^{88,89}$ Yの各同位体の生成断面積を導出した。励起関数について、TALYSやCCONEによる理論予測は、本研究や先行研究の実験値と概ね良い一致を示した。本研究で測定された断面積は、廃棄物処理に関する将来の検討のための貴重なデータとなる。

論文

Understanding spin currents from magnon dispersion and polarization; Spin-Seebeck effect and neutron scattering study on TbFeO $_{12}$

川本陽*; 吉川貴史; 齊藤英治; 他9名*

Applied Physics Letters, 124(13), p.132406_1 - 132406_7, 2024/03

https://doi.org/10.1063/5.0197831

被引用回数：3 パーセンタイル：88.42(Physics, Applied)

Magnon spin currents in the ferrimagnetic garnet Tb $_{3}$ Fe $_{5}$ O $_{12}$ with 4 electrons were examined through the spin-Seebeck effect and neutron scattering measurements. The compound shows a magnetic compensation, where the spin-Seebeck signal reverses above and below $_{rm comp}$ = 249.5(4) K. Unpolarized neutron scattering unveils two major magnon branches with finite energy gaps, which are well explained in the framework of spin-wave theory. Their temperature dependencies and the direction of the precession motion of magnetic moments, i.e., magnon polarization, defined using polarized neutrons, explain the reversal at $_{rm comp}$ and decay of the spin-Seebeck signals at low temperatures. We illustrate an example that momentum- and energy-resolved microscopic information is a prerequisite to understand the magnon spin current.

論文

Revealing the role of high-valence elementary substitution in the hydrogen-induced Mottronic transitions of vanadium dioxide

Zhou, X.*; 福谷克之; 他9名*

Applied Physics Letters, 124(8), p.082103_1 - 082103_7, 2024/02

https://doi.org/10.1063/5.0189271

被引用回数：6 パーセンタイル：92.44(Physics, Applied)

Electron-doping Mottronics within correlated vanadium dioxide opens up a paradigm to abruptly regulate the Mottronic phase transitions via adjusting the -orbital occupancy and configuration. Nevertheless, the potential impact of high-valence elementary substitution in the hydrogen-associated Mottronic transitions of VO $_{2}$ is yet unclear. Herein, we demonstrate the role of high-valence elementary substitution in regulating the hydrogen-triggered Mottronic transitions of VO $_{2}$ , assisted by quantitative hydrogen analysis using the nuclear reaction analysis. Substituting vanadium with a high-valence transitional metal within doped-VO $_{2}$ largely reduces the hydrogen incorporation compared to the intrinsic VO $_{2}$ under the low temperature hydrogenation process. Therefore, in contrast to hydrogen-induced electron localization of intrinsic VO $_{2}$ upon low-temperature hydrogenation, only the hydrogen-triggered metallic state is observed within the hydrogen-associated phase diagram of W $_{x}$ V $_{1-x}$ O $_{2}$ , as further probed by the near-edge X-ray absorption fine structure analysis and X-ray photoelectron spectroscopy. The present work reveals the overlooked role associated with the donor substitutions that largely influences the competitive equilibrium between the two rival hydrogen-induced Mottronic transitions within VO $_{2}$ toward either the metallic or the highly insulating phase.

論文

Studying the impact of deuteron non-elastic breakup on $^{93}$ Zr + d reaction cross sections measured at 28 MeV/nucleon

Chillery, T.*; Hwang, J.*; 堂園昌伯*; 今井伸明*; 道正新一郎*; 炭竃聡之*; 千賀信幸*; 大田晋輔*; 中山梓介; 他49名*

Progress of Theoretical and Experimental Physics (Internet), 2023(12), p.121D01_1 - 121D01_11, 2023/12

https://doi.org/10.1093/ptep/ptad139

被引用回数：2 パーセンタイル：48.32(Physics, Multidisciplinary)

重陽子は弱束縛系でありクーロン力と核力の下で容易に陽子と中性子に分解する。これまでの実験からは、核子当たり50から200MeVといった高入射エネルギーではこの分解過程が残留核生成に大きな影響を与えることが示されている。しかし、核子当たり50MeV以下のエネルギーでの断面積データはまだ不足している。本研究では、BigRIPSセパレータ、OEDOビームライン、SHARAQスぺクトロメータを用いて、 $^{93}$ Zr+d反応断面積を核子当たり約28MeVにおいて逆運動学法を用いて測定した。本研究で得られた断面積を過去の測定結果や理論計算と比較した。重陽子の分解の効果を定量的に考慮したDEURACS計算により実験データがよく再現された。本研究で測定された低エネルギー領域におけるデータは、将来の核廃棄物処理施設の検討に役立つと考えられる。

論文

Observation of a threshold cusp at the threshold in the mass spectrum with decays

Yang, S.*; 谷田聖; Belle Collaboration*; 他196名*

Physical Review D, 108(3), p.L031104_1 - L031104_6, 2023/08

https://doi.org/10.1103/PhysRevD.108.L031104

被引用回数：3 パーセンタイル：51.06(Astronomy & Astrophysics)

We observe a narrow peaking structure in the $pK^{-}$ invariant-mass spectrum near the threshold. The peak is clearly seen in 1.5 million events of $Lambda_{c}^{+} rightarrow p K^{-} pi^{+}$ decay using the $980~{rm fb^{-1}}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We try two approaches to explain this structure: as a new resonance and as a cusp at the threshold. The best fit is obtained with a coherent sum of a Flatt function and a constant background amplitude with the $chi^2/{rm n.d.f}=257/243$ (), while the fits to Breit-Wigner functions are unfavored by more than 7. The best fit explains the structure as a cusp at the threshold, and the obtained parameters are consistent with the known properties of . The observation gives the first identification of a threshold cusp in hadrons from the spectrum shape.

論文

First spectroscopic study of odd-odd $^{78}$ Cu

Pedersen, L. G.*; Sahin, E.*; Grgen, A.*; Bello Garrote, F. L.*; 角田佑介*; 大塚孝治*; 新倉潤*; Orlandi, R.; 他59名*

Physical Review C, 107(4), p.044301_1 - 044301_10, 2023/04

https://doi.org/10.1103/PhysRevC.107.044301

被引用回数：1 パーセンタイル：34.19(Physics, Nuclear)

Nuclei in the vicinity of $^{78}$ Ni (=28, =50) are important benchmarks to study the evolution of shell structure far from stability. Excited states in $^{78}$ Cu were observed for the first time following the -decay of $^{78}$ Ni, which was produced by in-flight fission of $^{238}$ U. Using -ray coincidences, a level scheme comprising eight excited states was built. Using the observed feeding and the -decay properties of the excited states, spin was tentatively assigned to 5 new states. In addition to the -decaying states, an isomeric state with a lifetime of 3.8(4) ms was found to decay by internal conversion. By comparing the results with large scale shell model calculations, quantitative information about the proton-neutron interaction outside the doubly magic $^{78}$ Ni core was obtained.

論文

Search for at Belle

Yin, J. H.*; 谷田聖; Belle Collaboration*; 他193名*

Physical Review D, 107(5), p.052004_1 - 052004_8, 2023/03

https://doi.org/10.1103/PhysRevD.107.052004

被引用回数：3 パーセンタイル：51.06(Astronomy & Astrophysics)

We present a search for the decay in the data sample collected at the Belle detector, where the is produced in $B^{pm}to K^{pm}X(3872)$ and $B^{0}to K_{S}^0 X(3872)$ decays. We do not observe a signal, and set 90% credible upper limits for two different models of the decay processes: if the decay products are distributed uniformly in phase space, $mathcal{B}(X(3872) to pi^+pi^-pi^0) < 1.3%$ ; if is concentrated near the mass of the pair in the process $X(3872)to D^0bar{D}^{*0}+c.c.to D^0 bar D^{0}pi^0topi^+ pi^- pi^0$ , $mathcal{B}(X(3872) to pi^+pi^-pi^0) < 1.2times10^{-3}$ .

論文

Measurement of the production ratio in collisions at the resonance using decays at Belle

Choudhury, S.*; 谷田聖; Belle Collaboration*; 他198名*

Physical Review D, 107(3), p.L031102_1 - L031102_6, 2023/02

https://doi.org/10.1103/PhysRevD.107.L031102

被引用回数：8 パーセンタイル：81.35(Astronomy & Astrophysics)

We measure the ratio of branching fractions for the decays to and $B^0bar{B}{}^0$ using and samples, where stands for ( or ), with fb $^{-1}$ of data collected at the resonance with the Belle detector. We find the decay rate ratio of over $Upsilon(4S) rightarrow B^0bar{B}{}^0$ to be , which is the most precise measurement to date. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainty is systematic due to the assumption of isospin symmetry in .

論文

Measurement of the branching fractions for Cabibbo-suppressed decays $D^{+}to K^{+} K^{-}pi^{+}pi^{0}$ and $D_{(s)}^{+}to K^{+}pi^{-}pi^{+}pi^{0}$ at Belle

Li, L. K.*; 谷田聖; Belle Collaboration*; 他197名*

Physical Review D, 107(3), p.033003_1 - 033003_9, 2023/02

https://doi.org/10.1103/PhysRevD.107.033003

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

We present measurements of the branching fractions for the singly Cabibbo-suppressed decays $D^+to K^{+}K^{-}pi^{+}pi^{0}$ and $D_s^{+}to K^{+}pi^{-}pi^{+}pi^{0}$ , and the doubly Cabibbo-suppressed decay $D^{+}to K^{+}pi^{-}pi^{+}pi^{0}$ , based on 980 ${rm fb}^{-1}$ of data recorded by the Belle experiment at the KEKB $e^{+}e^{-}$ collider. We measure these modes relative to the Cabibbo-favored modes $D^{+}to K^{-}pi^{+}pi^{+}pi^{0}$ and $D_s^{+}to K^{+}K^{-}pi^{+}pi^{0}$ . Our results for the ratios of branching fractions are $B(D^{+}to K^{+}K^{-}pi^{+}pi^{0})/B(D^{+}to K^{-}pi^{+}pi^{+}pi^{0}) = (11.32 pm 0.13 pm 0.26)%$ , $B(D^{+}to K^{+}pi^{-}pi^{+}pi^{0})/B(D^{+}to K^{-}pi^{+}pi^{+}pi^{0}) = (1.68 pm 0.11pm 0.03)%$ , and $B(D_s^{+}to K^{+}pi^{-}pi^{+}pi^{0})/B(D_s^{+}to K^{+}K^{-}pi^{+}pi^{0}) = (17.13 pm 0.62 pm 0.51)%$ , where the uncertainties are statistical and systematic, respectively. The second value corresponds to , where is the Cabibbo angle; this value is larger than other measured ratios of branching fractions for a doubly Cabibbo-suppressed charm decay to a Cabibbo-favored decay. Multiplying these results by world average values for $B(D^{+}to K^{-}pi^{+}pi^{+}pi^{0})$ and $B(D_s^{+}to K^{+}K^{-}pi^{+}pi^{0})$ yields $B(D^{+}to K^{+}K^{-}pi^{+}pi^{0})= (7.08pm 0.08pm 0.16pm 0.20)times10^{-3}$ , $B(D^{+}to K^{+}pi^{-}pi^{+}pi^{0})= (1.05pm 0.07pm 0.02pm 0.03)times10^{-3}$ , and $B(D_s^{+}to K^{+}pi^{-}pi^{+}pi^{0}) = (9.44pm 0.34pm 0.28pm 0.32)times10^{-3}$ , where the third uncertainty is due to the branching fraction of the normalization mode. The first two results are consistent with, but more precise than, the current world averages. The last result is the first measurement of this branching fraction.

論文

Formation and evolution of carbonaceous asteroid Ryugu; Direct evidence from returned samples

中村智樹*; 大澤崇人; 他219名*

Science, 379(6634), p.eabn8671_1 - eabn8671_14, 2023/02

https://doi.org/10.1126/science.abn8671

被引用回数：175 パーセンタイル：99.99(Multidisciplinary Sciences)

1から8mmのリュウグウ粒子16個の鉱物学的,岩石学的、および物理的特性は、それらがCIコンドライトに最も類似していることを示している。磁硫鉄鉱中のCO $_{2}$ 含有水の存在は、母天体が太陽系星雲のH $_{2}$ OおよびCO $_{2}$ のスノーラインを越えた領域で形成したことを示しており、ここでは、リュウグウの鉱物学に基づくと、小さなコンドリュールやCa, Alを含む非常に限られた量の高温物質がある。流体-岩石反応は、低温,高pH、および水/岩石の質量比が1未満の還元条件で発生し、リュウグウのサンプルで最も変化の少ない断片として残っているかんらん石-輝石に富む岩相を、リュウグウサンプルの主要な岩相であるフィロケイ酸塩-炭酸塩に富むものに変えた。リュウグウの母体の流体から磁鉄鉱が結晶化したとき、原始太陽系星雲はまだ存在していた可能性がある。

論文

Measurements of the branching fractions $mathcal{B} (bar{B}{}^0 to D^{+} pi^-)$ and $mathcal{B} (bar{B}{}^0 to D^{+} K^-)$ and tests of QCD factorization

Krohn, J.-F.*; 谷田聖; Belle Collaboration*; 他198名*

Physical Review D, 107(1), p.012003_1 - 012003_12, 2023/01

https://doi.org/10.1103/PhysRevD.107.012003

被引用回数：1 パーセンタイル：21.72(Astronomy & Astrophysics)

Using meson pairs recorded by the Belle experiment at the KEKB collider, we report the branching fractions $mathcal{B}(bar{B}^0 to D^{*+} pi^-) = (2.62 pm 0.02 pm 0.09)times 10^{-3}$ and $mathcal{B}(bar{B}^0 to D^{*+} K^-) = (2.22 pm 0.06 pm 0.08)times 10^{-4}$ ; the quoted uncertainties are statistical and systematic, respectively. A measurement of the ratio of these branching fractions is also presented, $mathcal{R}_{K/pi}=mathcal{B}(bar{B} to D^{*+}K^-) /mathcal{B}(bar{B} to D^{*+}pi^-) = (8.41 pm 0.24 pm 0.13)times 10^{-2}$ , where systematic uncertainties due to the $D^{*+}$ meson reconstruction cancel out. Furthermore, we report a new QCD factorization test based on the measured ratios for $bar{B} to D^{*+}h^-$ and $bar{B} to D^{*+}ell^-nu$ decays at squared momentum transfer values equivalent to the mass of the or hadron. The parameters are measured to be and , where the last uncertainties account for all external inputs. These values are approximately lower than those expected from theoretical predictions. Subsequently, flavor symmetry is tested by measuring the ratios for pions and kaons, , as well as for different particle species. The ratio is consistent with unity and therefore no evidence for symmetry breaking effects is found at the precision level.

論文

Evidence of a new excited charmed baryon decaying to $Sigma_{c}(2455)^{0,++} pi^{pm}$

Li, Y. B.*; 谷田聖; Belle Collaboration*; 他194名*

Physical Review Letters, 130(3), p.031901_1 - 031901_7, 2023/01

https://doi.org/10.1103/PhysRevLett.130.031901

被引用回数：13 パーセンタイル：92.03(Physics, Multidisciplinary)

We present the study of $bar{B}^{0} to Sigma_{c}(2455)^{0,++} pi^{pm} bar{p}$ decays based on $772times 10^{6}$ events collected with the Belle detector at the KEKB asymmetric-energy collider. The $Sigma_{c}(2455)^{0,++}$ candidates are reconstructed via their decay to $Lambda_{c}^{+} pi^{mp}$ and $Lambda_{c}^{+}$ decays to $pK^{-}pi^{+},~pK_{S}^{0},$ and $Lambdapi^{+}$ final states. The corresponding branching fractions are measured to be ${cal B}(bar{B}^{0} to Sigma_{c}(2455)^{0} pi^{+} bar{p}) = (1.09 pm 0.06 pm 0.07)times10^{-4}$ and ${cal B}(bar{B}^{0} to Sigma_{c}(2455)^{++} pi^{-} bar{p}) = (1.84pm 0.11 pm 0.12)times 10^{-4}$ , which are consistent with the world average values with improved precision. A new structure is found in the $M_{Sigma_{c}(2455)^{0,++}pi^{pm}}$ spectrum with a significance of including systematic uncertainty. The structure is possibly an excited $Lambda_{c}^{+}$ and is tentatively named $Lambda_{c}(2910)^{+}$ . Its mass and width are measured to be MeV/ $c^{2}$ and MeV, respectively. The products of branching fractions for the $Lambda_{c}(2910)^{+}$ are measured to be ${cal B}(bar{B}^{0} to Lambda_{c}(2910)^{+}bar{p})times{cal B}(Lambda_{c}(2910)^{+} to Sigma_{c}(2455)^{0}pi^{+}) = (9.5 pm 3.6 pm 1.6)times 10^{-6}$ and ${cal B}(bar{B}^{0} to Lambda_{c} (2910)^{+}bar{p})times {cal B}(Lambda_{c}(2910)^{+} to Sigma_{c}(2455)^{++}pi^{-}) = (1.24 pm 0.35 pm 0.10)times 10^{-5}$ . Here, the first and second uncertainties are statistical and systematic, respectively.

論文

J-PARC Hadron Experimental Facility extension project

佐久間史典*; 田村裕和; 谷田聖; 山本剛史; 他39名*

EPJ Web of Conferences, 271, p.11001_1 - 11001_7, 2022/11

https://doi.org/10.1051/epjconf/202227111001

The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through experiments with intense particle beams. In the past decade, many results from particle and nuclear physics experiments have been obtained at the present facility. To expand the physics programs to as yet unexplored regions, the extension project of the Hadron Experimental Facility has been extensively discussed. This contribution presents the physics of the extension of the Hadron Experimental Facility to resolve issues related to strangeness nuclear physics, hadron physics, and flavor physics.

論文

Measurement of differential cross sections for elastic scattering in the momentum range 0.44-0.80 GeV/c

七村拓野; 藤田真奈美; 長谷川勝一; 市川真也; 市川裕大; 今井憲一*; 成木恵; 佐藤進; 佐甲博之; 田村裕和; et al.

Progress of Theoretical and Experimental Physics (Internet), 2022(9), p.093D01_1 - 093D01_35, 2022/09

https://doi.org/10.1093/ptep/ptac101

被引用回数：15 パーセンタイル：84.99(Physics, Multidisciplinary)

We performed a novel scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 elastic scattering events were identified from tagged particles in the momentum range 0.44 - 0.80 GeV/c. The differential cross sections of the elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the and channels for the first time. The phase shift of the 3S1 channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated to be $20^circ<|delta_{^3S_1}|<35^circ$ . If the sign of $delta_{^3S_1}$ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.

論文

Search for $Z^{'} rightarrow mu^{+} mu^{-}$ in the $L_mu {-} L_tau$ gauge-symmetric model at Belle

Czank, T.*; 谷田聖; Belle Collaboration*; 他209名*

Physical Review D, 106(1), p.012003_1 - 012003_10, 2022/07

https://doi.org/10.1103/PhysRevD.106.012003

被引用回数：8 パーセンタイル：60.51(Astronomy & Astrophysics)

We search for a new gauge boson that couples only to heavy leptons and their corresponding neutrinos in the process $e^{+} e^{-} rightarrow Z'(rightarrow mu^{+}mu^{-}) mu^{+}mu^{-}$ , using a 643 fb $^{-1}$ data sample collected by the Belle experiment at or near the resonances at the KEKB collider. For the first time, effects due to initial state radiation are used in estimating the detection efficiency. No signal is observed in the mass range of 0.212 $- 10 GeV/${it c}^2$$ and we set an upper limit on the coupling strength, , constraining as a possible contributor to the anomalous magnetic dipole moment of muon.

論文

Search for the radiative penguin decays $B^{0} to K_S^{0}K_S^{0}$ in the Belle experiment

Jeon, H. B.*; 谷田聖; Belle Collaboration*; 他219名*

Physical Review D, 106(1), p.012006_1 - 012006_9, 2022/07

https://doi.org/10.1103/PhysRevD.106.012006

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

We report the first search for the penguin-dominated process using the full data sample of pairs collected with the Belle detector at the KEKB asymmetric-energy collider. We do not observe any statistically significant signal yield in the -pair invariant mass range 1 GeV/ $c^2 < M_{K_S^0 K_S^0} <$ 3 GeV/, and set the following upper limits at 90% confidence level: $mathcal{B}(B^0 to K_S^0 K_S^0 gamma) < 5.8times10^{-7}$ , $mathcal{B}(B^0 to f_2 gamma)times mathcal{B}(f_2 (1270) to K_S^0 K_S^0 ) < 3.1times10^{-7}$ , and $mathcal{B}(B^0 to f_2^{prime} gamma)times mathcal{B}(f_2^{prime} (1525) to K_S^0 K_S^0 ) < 2.1times10^{-7}$ . Further, 90% confidence upper limits have also been set in the range of [0.7-2.9] $times10^{-7}$ on the branching fraction in bins of $M_{K_S^0 K_S^0}$ .

論文

First Measurement of the decay

Li, S. X.*; 谷田聖; Belle Collaboration*; 他197名*

Journal of High Energy Physics (Internet), 2022(3), p.90_1 - 90_11, 2022/03

https://doi.org/10.1007/JHEP03(2022)090

被引用回数：8 パーセンタイル：65.00(Physics, Particles & Fields)

We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay with , using a data sample corresponding to an integrated luminosity of 981 $rm fb^{-1}$ , collected by the Belle detector at the KEKB $e^{+}$ $e^{-}$ asymmetric-energy collider. A significant signal is observed for the first time with a signal significance of 5.4. The relative branching fraction with respect to the normalization mode is measured to be $frac{{cal B}(Lambda_c^+ to p eta')}{{cal B}(Lambda_c^+ to p K^-pi^+)} = (7.54 pm 1.32 pm 0.75) times 10^{-3}$ ,where the uncertainties are statistical and systematic, respectively. Using the world-average value of ${cal B}(Lambda_c^+ to p K^-pi^+) = (6.28pm0.32)times10^{-2}$ , we obtain ${cal B}(Lambda_c^+ to p eta') = (4.73 pm 0.82 pm 0.47 pm 0.24)times 10^{-4}$ ,where the uncertainties are statistical, systematic, and from ${cal B}(Lambda_c^+ to pK^-pi^+)$ , respectively.

論文

Decay modes of the 9/2 isomeric state in $^{183}$ Tl

Venhart, M.*; Andreyev, A. N.; Cubiss, J. G.*; Wood, J. L.*; Barzakh, A. E.*; Van Beveren, C.*; Cocolios, T. E.*; de Groote, R. P.*; 他19名*

Physical Review C, 105(3), p.034338_1 - 034338_9, 2022/03

https://doi.org/10.1103/PhysRevC.105.034338

被引用回数：2 パーセンタイル：36.77(Physics, Nuclear)

The neutron-deficient region of isotopes around =82 is the best studied example of low-energy shape coexistence in nuclei. In this work, the internal transition decay and decay of the 53.3-ms isomeric state in $^{183}$ Tl were studied at ISOLDE, CERN. The branching for the internal decay was measured to be 98.5(4)%, while the much weaker decay branching is only about 1.4(4)%. The new results include the first identification of an transition feeding the 3/2 excited state in $^{183}$ Tl. Three decays from the $^{183m}$ Tl isomer were also oserved, and revealed the population of a candidate 9/2 state in $^{179}$ Au which has been linked to shape coexistence in the Au nuclei. It is expected that similarly weak decays from isomeric states may be found also in neighbouring Tl isotopes.

論文

Combined analysis of Belle and Belle II data to determine the CKM angle $phi_{3}$ using $B^+ to D(K_{S}^0 h^+ h^-) h^+$ decays

Abudinn, F.*; 谷田聖; Belle II Collaboration*; 他319名*

Journal of High Energy Physics (Internet), 2022(2), p.63_1 - 63_33, 2022/02

https://doi.org/10.1007/JHEP02(2022)063

被引用回数：4 パーセンタイル：42.30(Physics, Particles & Fields)

We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle $phi_{3}$ (also known as~) using a model-independent Dalitz plot analysis of $B^+to Dleft(K_{S}^{0}h^{+}h^{-}right)h^+$ , where is either a or $bar{D}{}^0$ meson and is either a or . This is the first measurement that simultaneously uses Belle and Belle~II data, combining samples corresponding to integrated luminosities of 711 fb $^{-1}$ and 128 fb $^{-1}$ , respectively. All data were accumulated from energy-asymmetric collisions at a centre-of-mass energy corresponding to the mass of the resonance. We measure $phi_3 = left(78.4 pm 11.4 pm 0.5 pm 1.0 right)^{circ}$ , where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is from the uncertainties on external measurements of the -decay strong-phase parameters.