Observation of $\eta_c\to\omega\omega$ in $J/\psi\to\gamma\omega\omega$ - INSPIRE

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Observation of $\eta_c\to\omega\omega$ in $J/\psi\to\gamma\omega\omega$

BESIII

Collaboration

May 24, 2019

13 pages

Published in:

Phys.Rev.D 100 (2019) 5, 052012

Published: Sep 24, 2019

e-Print:

1905.10318 [hep-ex]

DOI:

10.1103/PhysRevD.100.052012

PDG:

{{\mathit \eta}_{{{c}}}{(1S)}}

\rightarrow

{{\mathit \omega}}{{\mathit \omega}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

reference search9 citations

Citations per year

Abstract: (APS)

Using a sample of (1310.6±7.0)×106 J/ψ events recorded with the Beijing Spectrometer III detector at the Beijing Electron Positron Collider II, we report the observation of the decay of the (11S0) charmonium state ηc into a pair of ω mesons in the process J/ψ→γωω. The branching fraction is measured for the first time to be B(ηc→ωω)=(2.88±0.10±0.46±0.68)×10-3, where the first uncertainty is statistical, the second systematic, and the third is from the uncertainty of B(J/ψ→γηc). The mass and width of the ηc are determined as M=(2985.9±0.7±2.1) MeV/c2 and Γ=(33.8±1.6±4.1) MeV.

Note:

13 pages, 6 figures

Particle Physics Experiments
electron positron: annihilation
electron positron: colliding beams
J/psi(3100): radiative decay
omega(783): pair production
eta/c(2980): production
eta/c(2980): hadronic decay
mass spectrum: (2omega(783))
eta/c(2980): branching ratio: measured
J/psi(3100): branching ratio

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