Study of J/ψ→pp̄ and J/ψ→nn̄
Journal Article
·
· Physical Review. D, Particles, Fields, Gravitation and Cosmology
The decays J/ψ→pp̄ and J/ψ→nn̄ have been investigated with a sample of 225.2×10⁶ J/ψ events collected with the BESIII detector at the BEPCII e⁺e⁻ collider. The branching fractions are determined to be B(J/ψ→pp̄)=(2.112±0.004±0.031)×10⁻³ and B(J/ψ→nn̄)=(2.07±0.01±0.17)×10⁻³. Distributions of the angle θ between the proton or antineutron and the beam direction are well described by the form 1+αcos²θ, and we find α=0.595±0.012±0.015 for J/ψ→pp̄ and α=0.50±0.04±0.21 for J/ψ→nn̄. Our branching-fraction results suggest a large phase angle between the strong and electromagnetic amplitudes describing the J/ψ→NN¯¯¯ decay.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1103225
- 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: 28 works
Citation information provided by
Web of Science
Web of Science
Similar Records
Study of J / ψ and and
First observation of the isospin violating decay J/ψ→ΛΣ̄⁰+c.c.
Measurement of and evidence for the radiative decay
Journal Article
·
Mon Jul 10 00:00:00 EDT 2017
· Physics Letters. B
·
OSTI ID:1103225
+428 more
First observation of the isospin violating decay J/ψ→ΛΣ̄⁰+c.c.
Journal Article
·
Wed Aug 15 00:00:00 EDT 2012
· Physical Review. D, Particles, Fields, Gravitation and Cosmology
·
OSTI ID:1103225
+354 more
Measurement of and evidence for the radiative decay
Journal Article
·
Wed Jan 08 00:00:00 EST 2020
· Physical Review D
·
OSTI ID:1103225
+481 more