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論文

Analysis of spectral modification in nuclei using the PHSD transport approach

市川 真也; Gubler, P.; 成木 恵; 四日市 悟*

Journal of Subatomic Particles and Cosmology (Internet), 3, p.100018_1 - 100018_5, 2025/06

https://doi.org/10.1016/j.jspc.2024.100018

It is important to measure the hadron spectrum at finite density to explore the origin of hadron masses. At the KEK-PS E325 experiment, $$phi$$ mesons inside and outside nuclei were measured by using 12GeV pA reactions and significant spectral modification was observed. In order to accurately estimate the density that the $$phi$$ mesons felt during the reaction, a PHSD transport calculation of the respective reaction is currently ongoing. In this paper, PHSD and the current status of its implementation are reported.

論文

Experimental studies of in-medium modification of $$phi$$ meson mass through $$phi$$ $$rightarrow$$ $$K^{+}K^{-}$$ decays

佐甲 博之; 市川 真也; 成木 恵; 坂口 貴男; 佐藤 進; 他12名*

Journal of Subatomic Particles and Cosmology (Internet), 1-2, p.100012_1 - 100012_7, 2024/11

https://doi.org/10.1016/j.jspc.2024.100012

Experimental evidence for the mass and the chiral condensate of hadrons is still poor. To challenge this situation we aim to measure $$phi$$ meson mass inside the nucleus through $$K^{+}K^{-}$$ decays in proton-nucleus collisions at J-PARC. In this presentation we will show the experimental proposal (E88), and the status of preparation.

論文

Studies on the $$phi$$ meson production in nuclear matter and the $$phi N$$ correlation function

Gubler, P.

Journal of Subatomic Particles and Cosmology (Internet), 1-2, p.100007_1 - 100007_4, 2024/11

https://doi.org/10.1016/j.jspc.2024.100007

We first review results of transport simulations of 12 GeV pA reactions to study the $$phi$$ meson in nuclear matter, especially focusing on the production mechanism of the $$phi$$ meson in such reactions and on the generated dilepton spectrum. Next, we discuss a recent study calculating the $$phi N$$ correlation function, making use of a hadronic effective Lagrangian approach with coupled channels and comparing the result with the recent measurement of the same quantity by the ALICE collaboration.

論文

Separating the transverse and longitudinal modes of $$phi$$, $$rho$$, $$K^{ast}$$ and $$K_1$$ mesons through their angular-dependent two-body decay modes

Park, I. W.*; 佐甲 博之; 青木 和也*; Gubler, P.; Lee, S. H.*

Journal of Subatomic Particles and Cosmology (Internet), 1-2, p.100014_1 - 100014_11, 2024/11

https://doi.org/10.1016/j.jspc.2024.100014

The mass shift a spin-1 particle moving in the nuclear medium will depend on its polarization direction. To study polarization-independent mass shifts in the medium, we explore methods to isolate each polarization direction of spin-1 mesons through the angular-dependent two-body decay modes. Specifically, we study $$phi to K^+ K^-$$, $$rho to pi pi$$, $$K^{ast} to K pi$$, $$phi to e^+ e^-$$ and $$K_1 to rho K$$ ($$K^{ast} pi$$) decays. Concerning $$K^{ast}$$ and $$K_1$$ mesons, since both particles have vacuum widths smaller than 100 MeV, they are ideal candidates for experimentally measuring chiral partners. The simultaneous observation of mass shifts of these chiral partners would provide valuable insights into the contribution of chiral symmetry breaking to the generation of hadron masses.

口頭

Simulation of vector meson in nulcei using PHSD

市川 真也; Gubler, P.; 四日市 悟*; 成木 恵

no journal, , 

KEK-PS E325実験では、pA反応を用いた原子核密度におけるベクター中間子スペクトル測定が実施された。この実験においては、ベクター中間子の生成位置の違いや原子核を形成する核子のpA反応後の時間発展に起因する、ベクター中間子が崩壊時に感じる密度の不定性が存在する。これを解決するために、PHSDという輸送計算を用いたベクター中間子崩壊時における密度の計算と、それを用いたスペクトルの再解析を試みている。本講演ではこの現状について報告する。

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