Narrow Results

The dominant contribution to the uncertainty of the theoretical prediction of the (g-2) of the muon comes from the leading order hadronic vacuum polarization part. This contribution is evaluated using either tau or e⁺e^- experimental data. The same experimental data are exploited for QCD studies. We present an update of the ALEPH hadronic spectral functions. This update induces only small changes for the hadronic contribution to the (g-2) of the muon and for the QCD fits. We also present updates of the contributions to g-2 for several channels of e⁺e^- into hadrons.

The physics potential of the Circular Electron Positron Collider (CEPC) can be significantly strengthened by two detectors with complementary designs. A promising detector approach based on the Silicon Detector (SiD) designed for the International Linear Collider (ILC) is presented. Several simplifications of this detector for the lower energies expected at the CEPC are proposed. A number of cost optimizations of this detector are illustrated using full detector simulations. We show that the proposed changes will enable one to reach the physics goals at the CEPC.

We present recent results on study of exclusive processes of e⁺e⁻ annihilation into hadrons with the SND detector. Data were collected at the VEPP-2000 e⁺e⁻ collider in the center-of-mass energy range from 0.3 to 2 GeV. In particular, we have measured the cross sections for e⁺e⁻$e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ and $n\overline{n}$ studied the radiative decay of excited light vector mesons to $\eta {\pi }^0\gamma$, and performed a search for the rare processes of e⁺e⁻ annihilation into C-even resonances η and f₁(1285).

The physics potential of the Circular Electron Positron Collider (CEPC) can be significantly strengthened by two detectors with complementary designs. A promising detector approach based on the Silicon Detector (SiD) designed for the International Linear Collider (ILC) is presented. Several simplifications of this detector for the lower energies expected at the CEPC are proposed. A number of cost optimizations of this detector are illustrated using full detector simulations. We show that the proposed changes will enable one to reach the physics goals at the CEPC.