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تسجيل مستخدم جديدStudies of Charmonium at BESIII
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X. C. Ai
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In recent years, lots of studies of charmonium decays have been performed at BESIII based on large data samples of $J/psi$, $psi(3686)$ and $psi(3770)$. Recent results in searches for radiative transitions of $psi(3770)$ and rare phenomena in charmonium decays, and studies of light hadrons structures and properties will be presented.
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Based on $psi(3686)$ decays of 106 million, the 1.31 billion J/psi events and a data sample of $psi(3770)$ with $2.9~fb^{-1}$ integrated luminosity, many analyses are performed. Exclusively baryonic decays of the $psi(3770)$, the radiative transition
$psi(3770)togammaeta_c(2S)$, the $psi(3770)$ transition to $chi_{cJ}$, isospin violation decay $chi_{c0,2}topi^0eta_c$, the $C-$parity violation decays $J/psitogammagamma,gammaphi$ are searched for, but no significant signals are observed, and upper limits are set for these decays. The decays of $psi(3770)togammachi_{c1}$ and $J/psitopi^0phi$ signals are observed. These measurements provide more information on the charmonium structure, and the isospin and $C$-parity violation in the charmonium decays.
In 2009, the BESIII experiment has collected about 225M $jpsi$ and 106M $psip$ samples, both of which are the world largest on-peak charmonium production. Based on these dataset, BESIII has made great effort on the study of the charmonium decays, som
e important of which have been reviewed in this proceeding. In addition, a searching for new physics through the $CP/P$ violation process is reported.
Results based on 106 M $psi$ events and about 226 M $J/psi$ events acquired with the BESIII detector at BEPCII are reported, including a confirmation of the BESII $pbar{p}$ threshold enhancement in $J/psi to gamma pbar{p}$, branching ratios for $chi_
{cJ} to pi^0 pi^0$ and $eta eta$, and first measurements of the branching ratios for $psi to pi^0 h_c$ and $h_c to gamma eta_c$, as well as measurements of the mass and width of the $h_c$. Also reported are first observations of the two photon process $psi to gamma gamma J/psi$ and $f_0(980) - a_0(980)$ mixing.
We present recent results on charmonium and charmonium-like states from the BaBar B-factory located at the PEP-II asymmetric-energy $e^{+}e^{-}$ collider at the SLAC National Accelerator Laboratory.
Recent results on Charmonium decays are reviewed which includes two-, three- and four-body decays of $chi_{cJ}$ states, observations of Y(4260) through $pipi J/psi$ transitions, precise measurements of $M(D^0)$, $M(eta)$ as well as $mathcal{B}(etato X)$.
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