Search for new physics with charm rare decays at BESIII

TL;DR

This paper reports on searches for rare charm hadron decays at BESIII, utilizing large datasets to look for signals of new physics beyond the Standard Model through flavor-changing neutral currents and weak decays.

Contribution

The study presents the first search for specific FCNC and weak decay processes in charm hadrons at BESIII, expanding the experimental investigation into rare charm decays.

Findings

No significant signals observed for the targeted rare decays.

Sets new upper limits on branching fractions for these rare processes.

Provides constraints on new physics models affecting charm decays.

Abstract

Search for new physics with charm rare decays at BESIII. The BESIII experiment has collected 2.6 billion $\psi(3686)$ events, 10 billion $J/\psi$ events, $20 fb^{-1}$ D meson pairs at 3.773 GeV, and $7.33 fb^{-1}~D_{s}D_{s}^{*}$ events from 4.128 to 4.226 GeV. The huge data samples allow us to search for rare processes in charm hadron decays. In this paper, we report the FCNC decay in $J/\psi\to D^0\mu^+\mu^-$, $J/\psi\to D^0\gamma$ and $D_{s}^{+}\to h(h')e^+e^-$. The search for $J/\psi$ weak decays containing a D meson, $J/\psi\to D_{s}^{-}\pi^{+}$, and $J/\psi\to D_{s}^{-}\rho^{+}$ will also be presented.