Session G2: Invited Session: Results from Electron-Positron Colliders

Results from BaBar

We describe the most recent results from the BaBar experiment, focusing on direct and indirect searches for new physics effects. We will discuss measurements of rates and CP-violating asymmetries in rare decays of $B$ mesons, search for CP violation in $\tau$-lepton decays, and direct searches for low-mass dark sector and Higgs boson candidates. These measurements are unique to the B-factories and are complementary in their new physics sensitivity to direct searches at the LHC.   

Recent Results from Belle

In spring 2010, the Belle Collaboration completed data taking at the KEKB $e^+e^-$ collider after having collected the largest data samples at $\Upsilon(1S)$, $\Upsilon(2S)$, $\Upsilon(4S)$ and $\Upsilon(5S)$, totalling well over 1 $ab^{-1}$ of $e^+e^-$ collisions in its over ten year run. The Collaboration continues to produce very interesting new observations, and in this talk several of the most recent results will be described. Over the past year, the large $\Upsilon(5S)$ data set has produced several first observations in bottomonium and $B_S$ physics. Selected topics from this data set will include first observations of bottomonium and bottomonium-like states, new and improved measurements of transitions among these states. We will also present new results from the $\Upsilon(4S)$ data sample, including investigations of leptonic \& semileptonic B decays, charmless B decays and decays of B mesons to pairs of open charm mesons. Several of these results will include new or improved measurements of CP violating parameters and CKM mixing angles as well. In addition, plans for Belle II, the upgrade to the Belle detector, and Super-KEKB, the accelerator upgrade, will be briefly discussed.   

Electron-Positron Collisions in the Charmonium Region: Results from BESIII and CLEO-c

Electron-positron production of charmonium continues to be a viable technique for studying Quantum Chromodynamics (QCD). One can study the charmonium spectrum itself, where the heavy charm quarks are thought to permit a perturbative treatment of QCD dynamics. In addition, $c\bar{c}$-annihilation decays of charmonium are ideal for producing and studying the spectrum of light mesons. A review of recent results in the areas of light hadron and charmonium spectroscopy from the CLEO-c experiment, which completed data taking at the Cornell Electron Storage Ring in 2008, and BESIII, now taking data at the Beijing Institute for High Energy Physics, will be presented. The status and future data-taking plan of the BESIII experiment will also be briefly reviewed.