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Title: Observation and study of the decay J / ψ φ η η '

Journal Article · · Physical Review. D.
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We report the observation and study of the decay J / ψ φ η η ' using 1.3 × 1 0 9 J / ψ events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be ( 2.32 ± 0.06 ± 0.16 ) × 10 - 4 . We also report evidence for a structure, denoted as X , in the φ η ' mass spectrum in the 2.0 2.1 GeV / c 2 region. Using two decay modes of the η ' meson ( γ π + π - and η π + π - ), a simultaneous fit to the φ η ' mass spectra is performed. Assuming the quantum numbers of the X to be J P = 1 - , its significance is found to be 4.4 σ , with a mass and width of ( 2002.1 ± 27.5 ± 21.4 ) MeV / c 2 and ( 129 ± 17 ± 9 ) MeV , respectively, and a product branching fraction B ( J / ψ η X ) × B ( X φ η ' ) = ( 9.8 ± 1.2 ± 1.7 ) × 10 - 5 . Alternatively, assuming J P = 1 + , the significance is 3.8 σ , with a mass and width of ( 2062.8 ± 13.1 ± 7.2 ) MeV / c 2 and ( 177 ± 36 ± 35 ) MeV , respectively, and a product branching fraction B ( J / ψ η X ) × B ( X φ η ' ) = ( 9.6 ± 1.4 ± 2.0 ) × 10 - 5 . The angular distribution of J / ψ η X is studied and the two J P assumptions of the X cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic.

Research Organization:
George Washington Univ., Washington, DC (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States); Indiana Univ., Bloomington, IN (United States); Univ. of Hawaii, Honolulu, HI (United States); Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Natural Science Foundation of China (NSFC)
Contributing Organization:
BESIII Collaboration
Grant/Contract Number:
SC0016583; FG02-05ER41374; SC0010118; SC0010504; SC0012069
OSTI ID:
1526785
Alternate ID(s):
OSTI ID: 1594372
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 99 Journal Issue: 11; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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