2020 Fiscal Year Research-status Report
Connecting the QCD vacuum with experimental observables through realistic proton-nucleus reaction simulations
| Project/Area Number |
20K03940
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
GUBLER PHILIPP 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究職 (00632390)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | proton-nucleus reaction / phi meson / chiral symmetry / transport simulation |
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| Outline of Annual Research Achievements |
The major goal of this research project is to carry out realistic simulations of proton-nucleus reactions, in which the phi meson (and potentially other mesons) is created in nuclear matter and subsequently decays into di-leptons, which are experimentally measured. In these simulations, several scenarios for the modification of the phi meson in nuclear matter can be tested and it can be studied in what influence these scenarios have on the measured di-lepton spectrum. Therefore, by comparing the simulation results with the experimental di-lepton data, it should be possible to determine in what way the properties of the phi meson have changed in nuclear matter.
During the first year of the project, I first had to learn how to use the simulation code (called PHSD) that is used in the simulation. I did this under the supervision of Elena Bratkovskaya (Goethe University/GSI), who is one of the developers of this code. After having learned how to handle the code, I started to carry out some first simulations of the 12 GeV proton-nucleus reactions that were probed at the E325 experiment at KEK. The used nucleus targets were Carbon and Copper nuclei. By comparing the simulation results with the experimental di-lepton data of the E325 experiment, I found that the data can best reproduced in a scenario of a negative mass shift of about 34 MeV and only a small change in the decay width.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
As it was planned, I was able to simulate the proton-nucleus reactions probed at the E325 experiment at KEK, which allowed me to successfully analyze the experimental di-lepton data of this experiment and to reach a conclusion about the behavior of the phi meson in nuclear matter based on these experimental data.
After furthermore taking into account the effect of the electro-magnetic interaction on the di-leptons that are the decay-product of the phi meson, I will write a paper about these findings.
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| Strategy for Future Research Activity |
First, I will need to finish the analysis of the KEK E325 di-lepton data and plan to write a paper about the corresponding results during the first half of the next fiscal year.
After this task is completed, I will start running simulations of the 30 GeV proton-nucleus reactions that are currently measured at the J-PARC E16 experiment. In collaboration with the experimental researchers that perform this experiment, I will then use the results from these simulations to analyze the new experimental data with the goal of determining the behavior of the phi meson in nuclear matter with high precision. This will provide important information about the restoration of chiral symmetry within the strange quark sector in dense matter.
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| Causes of Carryover |
新型コロナウイルス感染症流行の影響を受け、令和2年度に予定していた国内外の研究会や国際会議の全てが中止またはオンライン開催となり、旅費の支出が発生しなかったため、次年度使用額が生じた。
次年度使用額は、令和3年度分経費と合わせて、令和3年度後半に国内外への出張が可能になった後に予定している共同研究者がいるドイツ・フランクフルトへ長期出張等に係る費用として使用する。
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[Journal Article] Signatures of the vortical quark-gluon plasma in hadron yields2020
Author(s)
Taya Hidetoshi, Park Aaron, Cho Sungtae, Gubler Philipp, Hattori Koichi, Hong Juhee, Huang Xu-Guang, Lee Su Houng, Monnai Akihiko, Ohnishi Akira, Oka Makoto, Yang Di-Lun
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Journal Title
Physical Review C
Volume: 102
Pages: 021901, 1-6
DOI
Peer Reviewed / Int'l Joint Research
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