Search for the Flavor-Changing Neutral-Current Decays $D^+\to \pi^+   \mu^+ \mu^-$ and $D^+\to \pi^+ e^+ e^-$

Fermilab E791 Collaboration

arXiv:hep-ex/9507003·hep-ex·August 27, 2012

Search for the Flavor-Changing Neutral-Current Decays $D^+\to \pi^+ \mu^+ \mu^-$ and $D^+\to \pi^+ e^+ e^-$

Fermilab E791 Collaboration

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TL;DR

This paper reports a search for rare flavor-changing neutral-current decays of the D+ meson into pion and lepton pairs, setting upper limits on their branching fractions due to no observed signal.

Contribution

The study provides new upper limits on the branching fractions of D+ decays to pion and lepton pairs, improving constraints on flavor-changing neutral currents in charm meson decays.

Findings

01

No signal observed above background.

02

Upper limits set on branching fractions: <1.8×10^{-5} for muons, <6.6×10^{-5} for electrons.

03

Results constrain new physics models involving flavor-changing neutral currents.

Abstract

We report the results of a search for the flavor-changing neutral-current decays $D^{+} \to π^{+} μ^{+} μ^{-}$ and $D^{+} \to π^{+} e^{+} e^{-}$ in data from Fermilab charm hadroproduction experiment E791. No signal above background is found, and we obtain upper limits on branching fractions, $B (D^{+} \to π^{+} μ^{+} μ^{-}) < 1.8 \times 1 0^{- 5}$ and $B (D^{+} \to π^{+} e^{+} e^{-}) < 6.6 \times 1 0^{- 5}$ , at the 90\% confidence level.

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