Observation of new resonant structures in $\gamma \gamma \to \omega \varphi$, $\varphi \varphi$ and $\omega \omega$

Abstract

The processes $\gamma \gamma \to \omega \varphi$, $\varphi \varphi$, and $\omega \omega$ are measured using an 870 fb${}^{-1}$ 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 clear 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 $\etac$, ${\chi }_{c0}$, and ${\chi }_{c2}$ two-photon decay widths and branching fractions.

7 pages, 3 figures, 1 table, version to appear in Phys. Rev. Lett

References in corpus (4)

• Heavy quarkonium: progress, puzzles, and opportunities
• High-statistics study of neutral-pion pair production in two-photon collisions
• Study of charmonia in four-meson final states produced in two-photon collisions
• Measurement of eta eta production in two-photon collisions

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