Speaker
Description
Two vector resonances with a mass near 2.2 GeV/$c^2$ are presently known: the $\phi(2170)$ observed in several production processes, but seen to decay only to $\phi(2170)\to\phi(1020)f_0(980)$, and the not well established $\rho(2150)$. Recently the BES-III experiment observed a clear interference pattern in the same energy region in $e^+e^-\to K^+K^-$, interpreted as a resonance with a mass of 2239 GeV and a width of 0.14 GeV. To shed light on the resonant states in this energy region we measure the reaction $e^+e^-\to K_SK_L$ with data collected with the $BABAR$ detector, and analyse these data in conjunction with published BES-III data on $e^+e^-\to K^+K^-$ and $BABAR$ data on $e^+e^-\to K^+K^-$, $\pi^+\pi^-$, $\pi^+\pi^-\eta$, $\pi^+\pi^-\omega$. This study supports the existence of an isovector resonance $\rho(2230)$ with mass $M = 2232\pm 8\pm 9$ MeV$/c^2$ and width $\Gamma = 133\pm 14 \pm 4$ MeV$/c^2$, consistent with the resonance observed by BES-III.
