Journal
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
Volume 2022, Issue 10, Pages -Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/ptep/ptac131
Keywords
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Funding
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Education, Science and Technology [2021R1A2C209336, 2018R1A5A1025563, 2020R1F1A1067876]
- National Research Foundation of Korea [2020R1F1A1067876] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study investigates the mass spectrum and electromagnetic transitions of charmonia, with a focus on the instanton effects.
We investigate the mass spectrum and electromagnetic transitions of charmonia, emphasizing the instanton effects on them. The heavy-quark potential consists of a Coulomb-like potential from one-gluon exchange and a linear confining potential. We introduce the nonperturbative heavy-quark potential derived from the instanton vacuum. We also consider the screened confining potential, which better describes the electromagnetic decays of higher excited states. Using this improved heavy-quark potential, we compute the mass spectrum and electromagnetic decays of charmonia. Focusing on the instanton effects, we discuss the results compared with the experimental data and those from other works. The instanton effects are marginal on the electromagnetic decays of charmonia.
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