Observation of New Resonant Structures in γγωϕ, ϕϕ, and ωω

Z. Q. Liu et al. (Belle Collaboration)
Phys. Rev. Lett. 108, 232001 – Published 8 June 2012

Abstract

The processes γγωϕ, ϕϕ, and ωω are measured using an 870fb1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e collider. Production of vector meson pairs is clearly observed and their cross sections are measured for masses that range from threshold to 4.0 GeV. In addition to signals from well established spin-zero and spin-two charmonium states, there are resonant structures below charmonium threshold, which have not been previously observed. We report a spin-parity analysis for the new structures and determine the products of the ηc, χc0, and χc2 two-photon decay widths and branching fractions to ωϕ, ϕϕ, and ωω.

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  • Received 25 February 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.232001

© 2012 American Physical Society

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Vol. 108, Iss. 23 — 8 June 2012

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