First observation of the isospin violating decay J/ψ→ΛΣ̄⁰+c.c.
Journal Article
·
· Physical Review. D, Particles, Fields, Gravitation and Cosmology
Using a sample of (225.2±2.8)×10⁶ J/ψ events collected with the BESIII detector, we present results of a study of J/ψ→γΛΛ¯¯¯ and report the first observation of the isospin violating decay J/ψ→ΛΣ¯¯¯⁰+c.c., in which Σ¯¯¯⁰ decays to γΛ¯¯¯. The measured branching fractions are B(J/ψ→Λ¯¯¯Σ⁰)=(1.46±0.11±0.12)×10⁻⁵ and B(J/ψ→ΛΣ¯¯¯⁰)=(1.37±0.12±0.11)×10⁻⁵. We search for Λ(1520)→γΛ decay, and find no evident signal, and an upper limit for the product branching fraction B(J/ψ→ΛΛ¯¯¯(1520)+c.c.)×B(Λ(1520)→γΛ)<4.1×10⁻⁶ is set at the 90% confidence level. We also report the observation of ηc→ΛΛ¯¯¯ in J/ψ→γηc, ηc→ΛΛ¯¯¯ and measure the branching fraction B(ηc→ΛΛ¯¯¯)=(1.16±0.12(stat)±0.19(syst)±0.28(PDG))×10⁻³.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1103128
- Journal Information:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Vol. 86 Journal Issue: 3; ISSN 1550-7998
- Publisher:
- American Physical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 22 works
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