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論文

An Innovative superconducting recoil separator for HIE-ISOLDE

Martel, I.*; Acosta, L.*; Aguado, J. L.*; Smallcombe, J.; 他68名*

Nuclear Instruments and Methods in Physics Research B, 541, p.176 - 179, 2023/08

https://doi.org/10.1016/j.nimb.2023.05.052
 被引用回数：3 パーセンタイル：46.61(Instruments & Instrumentation)

The ISOLDE Scientific Infrastructure at CERN offers a unique range of post-accelerated radioactive beams. The scientific program can be improved with the Isolde Superconducting Recoil Separator (ISRS), an innovative spectrometer able to deliver unprecedented (A, Z) resolution. In this paper we present an overview of the physics and ongoing technical developments.

論文

Measurements of strong-interaction effects in kaonic-helium isotopes at sub-eV precision with X-ray microcalorimeters

橋本 直; 谷田 聖; 他68名*

Physical Review Letters, 128(11), p.112503_1 - 112503_6, 2022/03

https://doi.org/10.1103/PhysRevLett.128.112503
 被引用回数：11 パーセンタイル：73.92(Physics, Multidisciplinary)

We have measured the $$3d to 2p$$ transition X-rays of kaonic $$^3$$He and $$^4$$He atoms using superconducting transition-edge-sensor microcalorimeters with an energy resolution better than 6 eV (FWHM). We determined the energies to be $$6224.5 pm 0.4$$ (stat) $$pm 0.2$$ (syst) eV and $$6463.7pm 0.3$$ (stat) $$pm 0.1$$ (syst) eV, and widths to be $$2.5pm 1.0$$ (stat) $$pm 0.4$$ (syst) eV and $$1.0 pm 0.6$$ (stat) $$pm 0.3$$ (stat) eV, for kaonic $$^3$$He and $$^4$$He, respectively. These values are nearly 10 times more precise than in previous measurements. Our results exclude the large strong-interaction shifts and widths that are suggested by a coupled-channel approach, and agree with calculations based on optical-potential models.

論文

Observation of the radiative decays of $$Upsilon(1S)$$ to $$chi_{c1}$$

Katrenko, P.*; 谷田 聖; Belle Collaboration*; 他168名*

Physical Review Letters, 124(12), p.122001_1 - 122001_7, 2020/03

https://doi.org/10.1103/PhysRevLett.124.122001
 被引用回数：2 パーセンタイル：17.95(Physics, Multidisciplinary)

We report the first observation of the radiative decay of the $$Upsilon(1S)$$ into a charmonium state. The statistical significance of the observed signal of $$Upsilon(1S) to gamma chi_{c1}$$ is 6.3 standard deviations including systematics. The branching fraction is calculated to be Br($$Upsilon(1S) to gamma chi_{c1}$$) = $$(4.7^{+2.4}_{-1.8} (stat) ^{+0.4}_{-0.5} (sys)) times 10^{-5}$$. We also searched for $$Upsilon(1S)$$ radiative decays into $$chi_{c0,2}$$ and $$eta_c(1S,2S)$$ and set upper limits on their branching fractions. These results are obtained from a 24.9 fb$$^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider at a center-of-mass energy equal to the $$Upsilon(2S)$$ mass using $$Upsilon(1S)$$ tagging by the $$Upsilon(2S) to Upsilon(1S) pi^+pi^-$$ transitions.

論文

Observation of $$Upsilon(4S)to eta' Upsilon(1S)$$

Guido, E.*; 谷田 聖; Belle Collaboration*; 他168名*

Physical Review Letters, 121(6), p.062001_1 - 062001_7, 2018/08

AA2018-0596.pdf:0.37MB

https://doi.org/10.1103/PhysRevLett.121.062001
 被引用回数：9 パーセンタイル：53.67(Physics, Multidisciplinary)

We report the first observation of the hadronic transition $$Upsilon(4S)toeta'Upsilon(1S)$$, using 496 fb$$^{-1}$$ data collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider. We reconstruct the $$eta'$$ meson through its decays to $$rho^0gamma$$ and to $$pi^+pi^-eta$$, with $$etatogammagamma$$. We measure: $${cal B}(Upsilon(4S)toeta'Upsilon(1S))=(3.43pm 0.88 {rm(stat.)} pm 0.21 {rm(syst.)})times10^{-5}$$, with a significance of 5.7$$sigma$$.

論文

Measurement of emission angle anisotropy via long-range angular correlations with high-$$p_T$$ hadrons in $$d$$$$+$$Au and $$p$$$$+$$$$p$$ collisions at $$sqrt{s_{_{NN}}}=200$$ GeV

Adare, A.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他468名*

Physical Review C, 98(1), p.014912_1 - 014912_16, 2018/07

https://doi.org/10.1103/PhysRevC.98.014912
 被引用回数：8 パーセンタイル：52.97(Physics, Nuclear)

We present measurements of two-particle angular correlations between high-transverse-momentum ($$2<p_T<11$$ GeV/$$c$$) $$pi^0$$ observed at midrapidity ($$|eta|<0.35$$) and particles produced either at forward ($$3.1<eta<3.9$$) or backward ($$-3.7<eta<-3.1$$) rapidity in $$d$$$$+$$Au and $$p$$$$+$$$$p$$ collisions at $$sqrt{s_{_{NN}}}=200$$ GeV. The azimuthal angle correlations for particle pairs with this large rapidity gap in the Au-going direction exhibit a ridge-like structure that persists up to $$p_T{approx}6$$ GeV/$$c$$ and which strongly depends on collision centrality, which is a similar characteristic to the hydrodynamical particle flow in A+A collisions. The ridge-like structure is absent in the $$d$$-going direction as well as in $$p$$$$+$$$$p$$ collisions, in the transverse-momentum range studied. The results indicate that the ridge-like structure is shifted in the Au-going direction toward more central collisions, similar to the charged-particle pseudorapidity distributions.

論文

Search for pentaquark $$Theta^+$$ in hadronic reaction at J-PARC

成木 恵*; 杉村 仁志; 今井 憲一; 市川 裕大; 細見 健二; 他68名*

Few-Body Systems, 54(7-10), p.955 - 960, 2013/08

https://doi.org/10.1007/s00601-013-0685-2
 被引用回数：2 パーセンタイル：19.27(Physics, Multidisciplinary)

J-PARCにおいてペンタクォーク探索実験を行った。測定方法として($$K^-,pi^-$$)方法が用いられ、これまでのSPring-8で行われた光生成反応とは違う反応である。ハドロン反応のほうがより直接的な反応のため、より有意なデータが提供できた。結果として、ペンタクォークは確認できず、生成断面積として、0.26$$mu$$b/srの上限値を与えた。このことにより、SPring-8との違いが考察され、生成反応の違いにより断面積も違うという結果が分かった。

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