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論文

Study of $$Lambda$$ identification method by the $$pi^-p to K^0Lambda$$ reaction for a $$Lambda p$$ scattering experiment at J-PARC

坂尾 珠和*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 真也; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.

JPS Conference Proceedings (Internet), 33, p.011133_1 - 011133_6, 2021/03

https://doi.org/10.7566/JPSCP.33.011133

The $$pi^-p to K^0Lambda$$ reaction is an important elementary process to produce $$Lambda$$ from a proton target and is a key for a $$Lambda p$$ scattering experiment where the momentum of $$Lambda$$ should be tagged from the missing momentum of the $$(pi^-,K^0)$$ reaction. However, the $$(pi^-,K^0)$$ spectroscopy method has not been established yet due to the difficulty of the $$K^0$$ detection. Therefore, we have proposed a new $$K^0$$ detection method where $$pi^+$$ and $$pi^-$$ from the $$K^0$$ decay are measured by a forward magnetic spectrometer and a detector cluster surrounding the target, respectively. The feasibility of the $$K^0$$ detection method was confirmed by analyzing the J-PARC E40 data taken with such a detector system. In the analysis, $$Lambda$$'s were successfully identified in the missing mass spectrum of the $$pi^-p to K^0 X$$ reaction.

論文

A $$Sigma p$$ scattering experiment at J-PARC and the analysis status

中田 祥之*; 長谷川 勝一; 早川 修平*; 細見 健二; 市川 裕大; 今井 憲一; 七村 拓野*; 成木 恵*; 佐甲 博之; 佐藤 進; et al.

JPS Conference Proceedings (Internet), 26, p.023024_1 - 023024_5, 2019/11

https://doi.org/10.7566/JPSCP.26.023024

J-PARC E40 aims to measure the differential cross sections of the $$Sigma^{pm}p$$ elastic scatterings and the $$Sigma^-p to Lambda n$$ conversion. A clear peak of $$Sigma^-$$ was observed in a missing mass spectrum of the $$pi^-pto K^+X$$ reaction and recoil protons from the $$pi p$$ elastic scattering were successfully observed in the data taken in the summer 2018. The rest of data taking is coming in the spring 2019.

論文

$$phi$$ meson production in the forward/backward rapidity region in Cu + Au 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505名*

Physical Review C, 93(2), p.024904_1 - 024904_13, 2016/02

AA2015-1019.pdf:0.98MB

https://doi.org/10.1103/PhysRevC.93.024904
 被引用回数：11 パーセンタイル：60.84(Physics, Nuclear)

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured $$phi$$ meson production and its nuclear modification in asymmetric Cu + Au heavy-ion collisions at $$sqrt{s_{NN}}$$ = 200 GeV at both forward Cu-going direction (1.2 $$<$$ y $$<$$ 2.2) backward Au-going direction (-2.2 $$<$$ y $$<$$ -1.2) rapidities. The measurements are performed via the dimuon decay channel and reported as a function of the number of participating nucleons, rapidity, and transverse momentum. In the most central events, 0% - 20% centrality, the $$phi$$ meson yield integrated over 1 $$< p_T <$$ 5 GeV/$$c$$ prefers a smaller value, which means a larger nuclear modification, in the Cu-going direction compared to the Au-going direction. Additionally, the nuclear-modification factor in Cu + Au collisions averaged over all centrality is measured to be similar to the previous PHENIX result in $$d$$ + Au collisions for these rapidities.

論文

Measurement of higher cumulants of net-charge multiplicity distributions in Au + Au collisions at $$sqrt{s_{NN}}$$ = 7.7-200 GeV

Adare, A.*; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他506名*

Physical Review C, 93(1), p.011901_1 - 011901_8, 2016/01

AA2015-0857.pdf:0.94MB

https://doi.org/10.1103/PhysRevC.93.011901
 被引用回数：76 パーセンタイル：97.61(Physics, Nuclear)

We report the measurement of cumulants ($$C_n$$, $$n=1,...,4$$) of the net-charge distributions measured within pseudorapidity ($$|eta| < 0.35$$) in Au + Au collisions at $$sqrt{s_{NN}}$$ = 7.7-200 GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider. The ratios of cumulants (e.g., $$C_1/C_2$$, $$C_3/C_1$$) of the net-charge distributions, which can be related to volume independent susceptibility ratios, are studied as a function of centrality and energy. These quantities are important to understand the quantum-chromodynamics phase diagram and possible existence of a critical end point. The measured values are very well described by expectation from negative binomial distributions. We do not observe any nonmonotonic behavior in the ratios of the cumulants as a function of collision energy. The measured values of $$C_1/C_2$$ and $$C_3/C_1$$ can be directly compared to lattice quantum-chromodynamics calculations and thus allow extraction of both the chemical freeze-out temperature and the baryon chemical potential at each center-of-mass energy. The extracted baryon chemical potentials are in excellent agreement with a thermal-statistical analysis model.

論文

Measurement of $$Upsilon(1S+2S+3S)$$ production in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; 今井 憲一; 谷田 聖; PHENIX Collaboration*; 他504名*

Physical Review C, 91(2), p.024913_1 - 024913_16, 2015/02

AA2015-0520.pdf:2.14MB

https://doi.org/10.1103/PhysRevC.91.024913
 被引用回数：37 パーセンタイル：89.79(Physics, Nuclear)

Measurements of bottomonium production in heavy-ion and $$p+p$$ collisions at the Relativistic Heavy Ion Collider (RHIC) are presented. The inclusive yield of the three $$Upsilon$$ states, $$Upsilon(1S+2S+3S)$$, was measured in the PHENIX experiment via electron-positron decay pairs at midrapidity for Au+Au and $$p+p$$ collisions at $$sqrt{s_{NN}} = 200$$ GeV. The $$Upsilon(1S+2S+3S) to e^+e^-$$ differential cross section at midrapidity was found to be $$B_{ee}dsigma/dy = 108 pm 38({rm stat.}) pm 15 ({rm syst.}) pm 11 ({rm luminosity})$$ pb in $$p+p$$ collisions. The nuclear modification factor in the 30% most central Au+Au collisions indicates a suppression of the total $$Upsilon$$ state yield relative to the extrapolation from $$p+p$$ collision data. The suppression is consistent with measurements made by STAR at RHIC and at higher energies by the CMS experiment at the Large Hadron Collider.

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