Observation of a Narrow K anti-K State in J/psi Radiative Decays
Sep, 198516 pages
Published in:
- Phys.Rev.Lett. 56 (1986) 107
Report number:
- SLAC-PUB-3786
Experiments:
Citations per year
Abstract: (APS)
Evidence is presented for a narrow state, called ξ, in the decay modes J/ψ→γξ, ξ→K+K−, and ξ→KS0KS0. In the K+K− mode, the ξ has a mass of 2.230±0.006±0.014 GeV/c2, a width of Γ=0.026−0.016+0.020± 0.017 GeV/c2, a product branching ratio of (4.2−1.4+1.7±0.8)×10 −5, and a statistical significance of ∼4.5 standard deviations. In the KS0KS0 mode, it has a mass of 2.232±0.007±0.007 GeV/c2, a width of Γ=0.018−0.015+0.023± 0.010 GeV/c2, a product branching ratio of (3.1−1.3+1.6±0.7)×10 −5, and a statistical significance of ∼3.6 standard deviations. Limits on ξ decay to other final states are presented.- ELECTRON POSITRON: COLLIDING BEAMS
- COLLIDING BEAMS: ELECTRON POSITRON
- ELECTRON POSITRON: ANNIHILATION
- ANNIHILATION: ELECTRON POSITRON
- J/PSI(3100): ELECTROPRODUCTION
- ELECTROPRODUCTION: J/PSI(3100)
- J/PSI(3100): RADIATIVE DECAY
- RADIATIVE DECAY: J/PSI(3100)
- POSTULATED PARTICLE: XI(2220)
- XI(2220): NONLEPTONIC DECAY
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