Study of ${\chi }_{cJ}$ radiative decays into a vector meson

Abstract

The decays ${\chi }_{cJ}\to \gamma V$ ($V=\varphi ,{\rho }^0,\omega$) are studied with a sample of radiative $\psip\toγχ_{cJ}$ events in a sample of $(1.06\pm0.04)\times 10^{8} \psip$ events collected with the BESIII detector. The branching fractions are determined to be: $\mathcal{B}({\chi }_{c1}\to \gamma \varphi )=(25.8\pm 5.2\pm 2.3)\times 10^{-6}$, $\mathcal{B}({\chi }_{c1}\to \gamma {\rho }^0)=(228\pm 13\pm 22)\times 10^{-6}$, and $\mathcal{B}({\chi }_{c1}\to \gamma \omega )=(69.7\pm 7.2\pm 6.6)\times 10^{-6}$. The decay ${\chi }_{c1}\to \gamma \varphi$ is observed for the first time. Upper limits at the 90% confidence level on the branching fractions for ${\chi }_{c0}$ and $\chict$ decays into these final states are determined. In addition, the fractions of the transverse polarization component of the vector meson in ${\chi }_{c1}\to \gamma V$ decays are measured to be $0.29_{-0.12-0.09}^{+0.13+0.10}$ for ${\chi }_{c1}\to \gamma \varphi$, $0.158\pm 0.034_{-0.014}^{+0.015}$ for ${\chi }_{c1}\to \gamma {\rho }^0$, and $0.247_{-0.087-0.026}^{+0.090+0.044}$ for ${\chi }_{c1}\to \gamma \omega$, respectively. The first errors are statistical and the second ones are systematic.

8 pages, 3 figures

References in corpus (2)

• Long-distant contribution and ${\chi }_{c1}$ radiative decays to light vector meson
• Radiative decays of charmonium into light mesons

Cited by in corpus (118)

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