Study of ${\rm Y}(1S)$ Radiative Decays to $\gamma {\pi }^{+}{\pi }^{-}$ and $\gamma K^{+}{K}^{-}$

Abstract

We study the ${\rm Y}(1S)$ radiative decays to $\gamma {\pi }^{+}{\pi }^{-}$ and $\gamma K^{+}{K}^{-}$ using data recorded with the BaBar detector operating at the SLAC PEP-II asymmetric-energy $e^{+}{e}^{-}$ collider at center-of-mass energies at the ${\rm Y}(2S)$ and ${\rm Y}(3S)$ resonances. The ${\rm Y}(1S)$ resonance is reconstructed from the decay ${\rm Y}(nS)\to {\pi }^{+}{\pi }^{-}{\rm Y}(1S)$, $n=2,3$. Branching fraction measurements and spin-parity analyses of ${\rm Y}(1S)$ radiative decays are reported for the I=0 $S$-wave and $f_2(1270)$ resonances in the ${\pi }^{+}{\pi }^{-}$ mass spectrum, the $f_2^{\prime }(1525)$ and $f_0(1500)$ in the $K^{+}{K}^{-}$ mass spectrum, and the $f_0(1710)$ in both.

20 pages, 20 postscript figures

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Cited by in corpus (4)

• Light meson spectroscopy from Dalitz plot analyses of ${\eta }_c$ decays to ${\eta }^{\prime }{K}^{+}{K}^{-}$, ${\eta }^{\prime }{\pi }^{+}{\pi }^{-}$, and $\eta {\pi }^{+}{\pi }^{-}$ produced in two-photon interactions
• Two dynamical generated $a_0$ resonances by interactions between vector mesons
• Further study of $f_0(1710)$ with coupled-channel approach and hadron molecular picture
• Strong decays of $a_0$, $f_0$, $f_2$, and $K_2^{\ast }$ resonances as dynamically generated states of two vector mesons