Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Search for the rare decays of $D\to h(h^{(')})e^{+}e^{-}$

BESIII collaboration

Abstract

We search for 15 rare decays of $D$ mesons to hadrons accompanied by an electron-positron pair $D\to h(h^{(')})e^{+}e^{-}$, based on 20.3 fb$^{-1}$ of $e^+ e^-$ collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector at BEPCII. No significant signals are observed, and the corresponding upper limits on the branching fractions at the 90\% confidence level are determined. The sensitivities of the results are at the level of $10^{-6}$ $\sim$ $10^{-7}$. The upper limits on the branching fractions for the $D^+\to ρ^{+} e^+ e^-$, $D^+\to K^{*+} e^+ e^-$, $D^0\to K_S^0 K_S^0 e^+ e^-$, $D^0\to π^0 π^0 e^+ e^-$ and $D^0\to η^{\prime} e^+ e^-$ decay channels are measured for the first time. For the $D^0\to π^0 e^+ e^-$, $D^0\to ηe^+ e^-$, $D^0\to ωe^+ e^-$, $D^0\to K_S^0 e^+ e^-$, $D^+\to π^+ π^0 e^+ e^-$, $D^+\to K^+ π^0 e^+ e^-$, $D^+\to π^+ K_S^0 e^+ e^-$ and $D^+\to K^+ K_S^0 e^+ e^-$ decay channels, the upper limits on the branching fractions are determined, with an improvement of at least a factor of four compared to previous searches. The upper limits on the branching fractions for the $D^0\to ρ^{0} e^+ e^-$ and $D^0\to φe^+ e^-$ decay channels are set at $0.7 \times 10^{-6}$ and $4.6 \times 10^{-6}$, respectively.

Search for the rare decays of $D\to h(h^{(')})e^{+}e^{-}$

Abstract

We search for 15 rare decays of mesons to hadrons accompanied by an electron-positron pair , based on 20.3 fb of collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector at BEPCII. No significant signals are observed, and the corresponding upper limits on the branching fractions at the 90\% confidence level are determined. The sensitivities of the results are at the level of . The upper limits on the branching fractions for the , , , and decay channels are measured for the first time. For the , , , , , , and decay channels, the upper limits on the branching fractions are determined, with an improvement of at least a factor of four compared to previous searches. The upper limits on the branching fractions for the and decay channels are set at and , respectively.
Paper Structure (9 sections, 2 equations, 3 figures, 7 tables)

This paper contains 9 sections, 2 equations, 3 figures, 7 tables.

Table of Contents

  1. Introduction
  2. BESIII detector and Monte Carlo simulation
  3. Method
  4. Single Tag selection
  5. Signal selection
  6. Systematic uncertainty
  7. Results
  8. Summary
  9. Acknowledgement

Figures (3)

  • Figure 1: Fits to the $M_{\rm BC}$ distributions of the ST $\bar{D}$ candidates. In each plot, the points with error bars correspond to the data, the blue curves are the best fits, and the dashed red curves describe the fitted combinatorial background shapes. The pair of black arrows indicate the $M_{\rm BC}$ signal window.
  • Figure 2: Distributions of $M_{\rm BC}^{\rm sig}$ for the signal modes after applying all selection criteria. The solid histograms are data, the hatched ones are the background events in the inclusive MC samples scaled to the luminosity of data. The black dashed lines denote the signal region.
  • Figure 3: Likelihood curves as a function of the signal BFs. The arrows point to the position of the ULs at the 90%C.L..