Observation of $χ_{c1}$ decays into vector meson pairs $φφ$, $ωω$, and $ωφ$

Details Observation of $χ_{c1}$ decays into vector meson pairs $φφ$, $ωω$, and $ωφ$ Observation of $χ_{c1}$ decays into vector meson pairs $φφ$, $ωω$, and $ωφ$

2011-04-27

arxiv.org/abs/1104.5068v2

Phys.Rev.Lett. 107:092001,2011

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 2 figures

Scientific paper

Decays of $\chi_{c1}$ to vector meson pairs $\phi\phi$, $\omega\omega$ and $\omega\phi$ are observed for the first time using $(106\pm4)\times 10^6$ $\psip$ events accumulated at the BESIII detector at the BEPCII $e^+e^-$ collider. The branching fractions are measured to be $(4.4\pm 0.3\pm 0.5)\times 10^{-4}$, $(6.0\pm 0.3\pm 0.7)\times 10^{-4}$, and $(2.2\pm 0.6\pm 0.2)\times 10^{-5}$, for $\chi_{c1}\to \phi\phi$, $\omega\omega$, and $\omega\phi$, respectively. The observation of $\chi_{c1}$ decays into a pair of vector mesons $\phi\phi$, $\omega\omega$ and $\omega\phi$ indicates that the hadron helicity selection rule is significantly violated in $\chi_{cJ}$ decays. In addition, the measurement of $\chi_{cJ}\to \omega\phi$ gives the rate of doubly OZI-suppressed decay. Branching fractions for $\chi_{c0}$ and $\chi_{c2}$ decays into other vector meson pairs are also measured with improved precision.

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