2019 Fiscal Year Research-status Report
Strange and charm quarks in nuclear matter - connecting theory with experiment
| Project/Area Number |
18K13542
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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, 任期付研究員 (00632390)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | QCD sum rules / QCD condensates / phi meson / pentaquark / D meson |
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| Outline of Annual Research Achievements |
During the second year of the grant period, I completed three research projects related to the topic of this grant, among which the first two are published in the journal "Physics Letters B" and the third is currently under review for publication. All these projects are international collaborations between researchers from Japan, China, South Korea and Germany.
The first project employed the non-relativistic quark model to study the possible existence of relatively stable pentaquark states composed of three strange quarks, one charm quark and an anti-charm quark. Even though no bound state was found, several sharp resonances were shown to exist for multiple spin-parity quantum numbers, which could be found in future experiments.
The second project, which is closely related to one of the central motivation for obtaining this grant, dealt with the properties of the phi meson with non-zero momentum in nuclear matter. We showed that longitudinally and transversely polarized phi-meson state behave differently with increasing momentum, which could lead to a double-peak in the di-lepton spectrum to be measured at the E16 experiment at J-PARC.
The third project investigated the D meson in hot matter (realized for instance in heavy-ion collisions) and studied the relation of this behavior to the heavy quark - anti-quark potential at finite temperature.
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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
One big goal of this grant was to study the the phi meson with non-zero momentum in nuclear matter and to make predictions for the future E16 experiment at the J-PARC facility. This was achieved.
Furthermore, I also successfully conducted a study about the D meson in (hot) matter.
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| Strategy for Future Research Activity |
As already noted in last year's report, I modified my my research plan by starting a new (and not previously planned) research project about simulating pA (p: proton, A: nucleon) collisions. This happened because I realized that for actually comparing theoretical studies with experimental data, such simulations are indispensable. This sort of simulation is presently ongoing and I hope to obtain some first publishable results during the next fiscal year.
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| Causes of Carryover |
R2年3月に予定していた、韓国Yonsei大での研究協力者との打合せと日本物理学会における口頭発表が新型コロナウイルスの影響を受けてそれぞれ延期と中止になったため、これらに係る費用が次年度使用額として生じることになった。次年度使用額はR2年度経費と合わせて、R2年度に改めて行う研究打合せと学会発表に係る費用して使用する。
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