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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：5 パーセンタイル：42.62(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

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：42.62(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：74.17(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：208 パーセンタイル：99.97(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：16.70(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：16 パーセンタイル：91.47(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

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：55.29(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：3 パーセンタイル：44.35(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：37.56(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.

論文

Measurement of differential branching fractions of inclusive ${B to X_u , ell^+, nu_{ell}}$ decays

Cao, L.*; 谷田聖; Belle Collaboration*; 他199名*

Physical Review Letters, 127(26), p.261801_1 - 261801_8, 2021/12

AA2022-0196.pdf:0.68MB

https://doi.org/10.1103/PhysRevLett.127.261801

被引用回数：6 パーセンタイル：50.22(Physics, Multidisciplinary)

The first measurements of differential branching fractions of inclusive semileptonic ${B to X_u , ell^+, nu_{ell}}$ decays are performed using the full Belle data set of 711 fb $^{-1}$ of integrated luminosity at the resonance and for . Differential branching fractions are reported as a function of the lepton momentum, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic ${B to X_c , ell^+, nu_{ell}}$ decays and other processes, and corrected for resolution and acceptance effects. The measured distributions are compared to predictions from inclusive and hybrid ${B to X_u , ell^+, nu_{ell}}$ calculations.

論文

Search for $B^{0} to tau^pm ell^mp$ () with a hadronic tagging method at Belle

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

Physical Review D, 104(9), p.L091105_1 - L091105_9, 2021/11

https://doi.org/10.1103/PhysRevD.104.L091105

被引用回数：7 パーセンタイル：43.47(Astronomy & Astrophysics)

We present a search for the lepton-flavor-violating decays $B^{0} to tau^pm ell^mp$ , where , using the full data sample of pairs recorded by the Belle detector at the KEKB asymmetric-energy collider. We use events in which one meson is fully reconstructed in a hadronic decay mode. The lepton is reconstructed indirectly using the momentum of the reconstructed and that of the from the signal decay. We find no evidence for $B^{0} to tau^pm ell^mp$ decays and set upper limits on their branching fractions at 90% confidence level of ( $B^{0} to tau^pm mu^{mp}$ ) $< 1.5 times 10^{-5}$ and ( $B^{0} to tau^pm e^{mp}$ ) $< 1.6 times 10^{-5}$ .

論文

Measurement of the branching fraction of decay at Belle

Li, S. X.*; 谷田聖; Belle Collaboration*; 他193名*

Physical Review D, 104(7), p.072008_1 - 072008_8, 2021/10

https://doi.org/10.1103/PhysRevD.104.072008

被引用回数：5 パーセンタイル：27.12(Astronomy & Astrophysics)

Using 980.6 $rm fb^{-1}$ of data collected with the Belle detector operating at the KEKB asymmetric-energy collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay . A clear signal is observed for with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions ${cal B}(Lambda_c^+ to p omega)/{cal B}(Lambda_c^+ to p K^- pi^+) = (1.32 pm 0.12 (rm stat) pm 0.10 (rm syst))times 10^{-2}$ , from which we infer the branching fraction ${cal B}(Lambda_c^+ to p omega) = (8.27 pm 0.75 (rm stat) pm 0.62 (rm syst) pm 0.42 (rm ref))times 10^{-4}$ . The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode .

論文

Evidence for the decay $Omega_{c}^{0} to pi^+Omega(2012)^- to pi^+ (bar{K}Xi)^{-}$

Li, Y.*; 谷田聖; Belle Collaboration*; 他190名*

Physical Review D, 104(5), p.052005_1 - 052005_9, 2021/09

https://doi.org/10.1103/PhysRevD.104.052005

被引用回数：12 パーセンタイル：61.30(Astronomy & Astrophysics)

Using a data sample of 980~fb $^{-1}$ collected with the Belle detector operating at the KEKB asymmetric-energy collider, we present evidence for the in the resonant substructure of $Omega_{c}^{0} to pi^+ (bar{K}Xi)^{-}$ ( $(bar{K}Xi)^{-}$ = + $bar{K}^0 Xi^-$ ) decays. The significance of the signal is 4.2 after considering the systematic uncertainties. The ratio of the branching fraction of $Omega_{c}^{0} to pi^{+} Omega(2012)^- to pi^+ (bar{K}Xi)^{-}$ relative to that of $Omega_{c}^{0} to pi^{+} Omega^-$ is calculated to be 0.220 0.059(stat.) 0.035(syst.). The individual ratios of the branching fractions of the two isospin modes are also determined, and found to be ${cal B}(Omega_{c}^0 to pi^+ Omega(2012)^-) times {cal B}(Omega(2012)^- to K^-Xi^0)/{cal B}(Omega_{c}^0 to pi^+ K^- Xi^0)$ =(9.6 3.2(stat.) 1.8(syst.))% and ${cal B}(Omega_{c}^0 to pi^+ Omega(2012)^-) times {cal B}(Omega(2012)^- to bar{K}^0 Xi^-)/{cal B}(Omega_{c}^0 to pi^+ bar{K}^0 Xi^-)$ = (5.5 2.8(stat.) 0.7(syst.))%.

論文

Search for the decay

Nisar, N. K.*; 谷田聖; Belle Collaboration*; 他197名*

Physical Review D, 104(3), p.L031101_1 - L031101_8, 2021/08

https://doi.org/10.1103/PhysRevD.104.L031101

被引用回数：1 パーセンタイル：7.09(Astronomy & Astrophysics)

We report the results of the first search for the decay using $121.4~textrm{fb}^{-1}$ of data collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. We observe no significant signal and set a 90% confidence-level upper limit of $6.5 times 10^{-5}$ on the branching fraction of this decay.

論文

The Energy spectrum of forward photons measured by the RHICf experiment in = 510 GeV proton-proton collisions

佐藤健太*; 谷田聖; 他19名*

Proceedings of Science (Internet), 358, p.413_1 - 413_8, 2021/07

https://doi.org/10.22323/1.358.0413

The Relativistic Heavy Ion Collider forward (RHICf) experiment aims at understanding the high-energy hadronic interaction by measuring the cross sections of very forward neutral particles in proton-proton collisions at = 510 GeV. For the analysis of the photon measurement, the trigger efficiency and the particle identification performance are studied by using the Monte Carlo simulation data and the experimental data. In the RHICf operation, two kinds of trigger modes (Shower, HighEM) were implemented. The trigger efficiency of the Shower trigger is 100% for photons with the energies more than 20 GeV. The HighEM trigger is designed to detect high energy photons effectively, and the trigger efficiency of the HighEM trigger is 90% for photons with the energies more than 130 GeV. The correction factor for the photon identification is calculated by using the efficiency and purity. It is found that this correction does not make a sizeable effect on the shape of the energy spectrum because the energy dependency of the factor is small.

論文

Measurement of the resonant and nonresonant branching ratios in $Xi_{c}^{0} rightarrow Xi^{0} K^+ K^-$

McNeil, J. T.*; 谷田聖; Belle Collaboration*; 他193名*

Physical Review D, 103(11), p.112002_1 - 112002_11, 2021/06

AA2022-0157.pdf:0.6MB

https://doi.org/10.1103/PhysRevD.103.112002

被引用回数：4 パーセンタイル：27.12(Astronomy & Astrophysics)

Using the entire data sample of $rm fb^{-1}$ integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed, -exchange resonant decay $Xi_{c}^{0} rightarrow Xi^{0} phi (to K^+ K^-)$ with a polarized and the non-resonant decay via a direct process $Xi_{c}^{0} rightarrow Xi^{0} K^+ K^-$ . We present these measurements, relative to the normalization mode $Xi^{-}pi^{+}$ , and find branching ratios $frac{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{0} phi (rightarrow K^{+}K^{-}))}{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{-} pi^{+})}$ = and $frac{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{0} K^{+} K^{-})}{mathcal{B}(Xi_{c}^{0} rightarrow Xi^{-} pi^{+})}$ = which suggest that only minor cusping peaks occur in the combinatorial background of $Omega^{*-} to Xi^{0}K^{-}$ due to these $Xi_{c}^{0}$ decays.

論文

Search for transitions from and to and with emission of an meson

Oskin, P.*; 谷田聖; Belle Collaboration*; 他198名*

Physical Review D, 102(9), p.092011_1 - 092011_8, 2020/11

https://doi.org/10.1103/PhysRevD.102.092011

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

Using data collected in the Belle experiment at the KEKB asymmetric-energy collider we search for transitions , and . No significant signals are observed and we set 90% confidence level upper limits on the corresponding visible cross sections: and , respectively.

論文

First search for the $eta_{c2}(1D)$ in decays at Belle

Chilikin, K.*; 谷田聖; Belle Collaboration*; 他194名*

Journal of High Energy Physics (Internet), 2020(5), p.34_1 - 34_22, 2020/05

https://doi.org/10.1007/JHEP05(2020)034

被引用回数：4 パーセンタイル：24.30(Physics, Particles & Fields)

The first dedicated search for the $eta_{c2}(1D)$ is carried out using the decays $B^+ rightarrow eta_{c2}(1D) K^+$ , $B^0 rightarrow eta_{c2}(1D) K^0_S$ , $B^0 rightarrow eta_{c2}(1D) pi^- K^+$ , and $B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S$ with $eta_{c2}(1D) to h_c gamma$ . No significant signal is found. For the $eta_{c2}(1D)$ mass range between and $3845 mathrm{MeV}/c^2$ , the branching-fraction upper limits are determined to be $mathcal{B}(B^+ rightarrow eta_{c2}(1D) K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.7 times 10^{-5}$ , $mathcal{B}(B^0 rightarrow eta_{c2}(1D) K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.5 times 10^{-5}$ , $mathcal{B}(B^0 rightarrow eta_{c2}(1D) pi^- K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.0 times 10^{-4}$ , and $mathcal{B}(B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.1 times 10^{-4}$ at 90% C. L. The analysis is based on the 711 $mathrm{fb}^{-1}$ data sample collected on the resonance by the Belle detector, which operated at the KEKB asymmetric-energy collider.