Measurement of the matrix elements for the decays and
Journal Article
·
· Physical Review D
Based on a sample of 1.31 × 109 J/ψ events collected with the BESIII detector, the matrix elements for the decays η' → ηπ+π- and η' → ηπ0π0 are determined using 351,016 η' → (η → γγ)π+π- and 56,249 η' → (η → γγ)π0π0 events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between η' → ηπ+π- and η' → ηπ0π0 is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in η' → ηπ0π0 is observed.
- Research Organization:
- George Washington Univ., Washington, DC (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- BESIII Collaboration
- Grant/Contract Number:
- FG02-05ER41374; SC-0010118; SC-0010504; SC-0012069; SC0016583
- OSTI ID:
- 1416420
- Alternate ID(s):
- OSTI ID: 1440854
- Journal Information:
- Physical Review D, Journal Name: Physical Review D Vol. 97 Journal Issue: 1; ISSN 2470-0010
- Publisher:
- American Physical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 12 works
Citation information provided by
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