D rare/forbidden decays at BESIII

TL;DR

This paper reports on searches for rare and forbidden D meson decays at BESIII, setting upper limits that are still above Standard Model expectations, using data from 2.92/fb at 3.773 GeV.

Contribution

First search for D meson rare/forbidden decays at BESIII using double and single tag techniques with new upper limits.

Findings

Upper limits on D→γγ decays set but above Standard Model predictions.

Constraints on charged D decays into kaon/pion plus electron pairs.

Analysis based on 2.92/fb data at 3.773 GeV.

Abstract

In this document we present the latest result on rare/forbidden decays for D mesons at the BESIII experiment. Based on 2.92/fb data taken at the center-of-mass energy 3.773 GeV with the BESIII detector, the flavor-changing neutral current process of neutral D decays into two gammas is searched using a double tag technique, while the decays of charged D decays into a charged kaon/pion plus two electrons/positrons are studied based on a single tag method. The resulting upper limits are still above the Standard Model predictions.