| 研究実績の概要 |
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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| 今後の研究の推進方策 |
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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