Observation of η' → ωe+e−
Based on a sample of η' mesons produced in the radiative decay J/ψ→γη' in 1.31×109 J/ψ events collected with the BESIII detector, the decay η'→ωe+e− is observed for the first time, with a statistical significance of 8σ. The branching fraction is measured to be B(η'→ωe+e−)=(1.97±0...
| Published in: | Physical Review D Vol. 92, № 5. P. 051101-1-051101-8 |
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| Other Authors: | , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Online Access: | http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000579659 Перейти в каталог НБ ТГУ |
| Summary: | Based on a sample of η' mesons produced in the radiative decay J/ψ→γη' in 1.31×109 J/ψ events collected with the BESIII detector, the decay η'→ωe+e− is observed for the first time, with a statistical significance of 8σ. The branching fraction is measured to be B(η'→ωe+e−)=(1.97±0.34(stat)±0.17(syst))×10−4, which is in agreement with theoretical predictions. The branching fraction of η'→ωγ is also measured to be (2.55±0.03(stat)±0.16(syst))×10−2, which is the most precise measurement to date, and the relative branching fraction B(η'→ωe+e−)B(η'→ωγ) is determined to be (7.71±1.34(stat)±0.54(syst))×10−3. |
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| Bibliography: | Библиогр.: 16 назв. |
| ISSN: | 1550-7998 |