QCD Axial Anomaly Enhances the ηη' Decay of the Hybrid Candidate η1(1855)
We study the hybrid mesons with the exotic quantum number IG JPC = 0+1−+ and investigate their decays into the ηη', a1(1260)π, f1(1285)η, f1(1420)η, K*(892)K-, K1(1270)K-, and K1(1400)K-,, channels. It is found that the QCD axial anomaly enhances the decay width of the ηη' channel although...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Institute of Physics
2022
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| Online Access: | View Fulltext in Publisher |
| Summary: | We study the hybrid mesons with the exotic quantum number IG JPC = 0+1−+ and investigate their decays into the ηη', a1(1260)π, f1(1285)η, f1(1420)η, K*(892)K-, K1(1270)K-, and K1(1400)K-,, channels. It is found that the QCD axial anomaly enhances the decay width of the ηη' channel although this mode is strongly suppressed by the small p-wave phase space. Our results support the interpretation of the η1(1855) recently observed by BESIII as the s-sg hybrid meson of IGJPC = 0+1−+. The QCD axial anomaly ensures the ηη' decay mode to be a characteristic signal of the hybrid nature of the η1(1855). © 2022 Chinese Physical Society and IOP Publishing Ltd |
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| ISBN: | 0256307X (ISSN) |
| DOI: | 10.1088/0256-307X/39/5/051201 |