Search

This paper discusses various aspects of the physical program Super Tau-Charm facility — a future flavor super-factory, whose construction is currently being discussed in China and Russia. Particular attention is paid to the study of charmed baryons, where record statistics Super Tau-Charm facility can provide significant progress. [ABSTRACT FROM AUTHOR]

Data on 7 open-charm channels collected by the Belle Collaboration are analyzed simultaneously using a unitary approach based on a coupled channel model in a wide energy range s$ \sqrt s $ = 3.7 − 4.7 GeV. The resulting fit provides a remarkably good overall description of the line shapes in all studied channels. Parameters of 5 vector charmonium resonances are extracted from the fit. It is demonstrated, that this approach could be used account for all exclusive channels and thus solve the long-term problem of the charmonium spectra near threshold.

The first results of the Super Charm-Tau factory muon system simulation are presented: estimation of the main characteristics such as space resolution and muon identification efficiency. A design of the muon system for the Super Charm-Tau factory based on the organic scintillator + WLS fiber + SiPM is proposed.

Hypothetical particles with tiny electric charges (millicharged particles or MCPs) can be produced in electron-positron annihilation if kinematically allowed. Typical searches for them at e + e − colliders exploit a signature of a single photon with missing energy carried away by the undetected MCP pair. We put forward an idea to look alternatively for MCP energy deposits inside a tracker, which is a direct observation. The new signature is relevant for non-relativistic MCPs, and we illustrate its power on the example of the c - τ factory, where we argued that the corresponding searches may be background-free. We find that it can probe the MCP charge down to 3 × 10 − 3 of the electron charge for the MCP masses in O (5) MeV vicinity of each energy beam value where the factory will collect a luminosity of 100 fb−1 in one year. This mass region is unreachable with the searches for missing energy and single photon. [ABSTRACT FROM AUTHOR]