The doubly Cabibbo-suppressed decay $D^+\to K^+ \pi^- \pi^+$

The Fermilab E791 Collaboration

arXiv:hep-ex/9706025·hep-ex·August 27, 2012

The doubly Cabibbo-suppressed decay $D^+\to K^+ \pi^- \pi^+$

The Fermilab E791 Collaboration

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TL;DR

This paper reports the first observation of a doubly Cabibbo-suppressed decay of the D+ meson, measuring its branching ratio relative to a favored decay and analyzing its resonant substructures.

Contribution

The study provides the first measurement of the branching ratio for the doubly Cabibbo-suppressed decay D+ to K+ pi- pi+ and performs a Dalitz plot analysis to explore resonant contributions.

Findings

01

Observed 59 ± 13 events of the decay.

02

Measured branching ratio to be (7.7 ± 1.7 ± 0.8) × 10^{-3}.

03

Performed Dalitz plot analysis for resonant structures.

Abstract

We report the observation of the doubly Cabibbo-suppressed decay $D^{+} \to K^{+} π^{-} π^{+}$ in data from Fermilab charm hadroproduction experiment E791. With a signal of 59 \pm 13 events we measured the ratio of the branching fraction for this mode to that of the Cabibbo-favored decay $D^{+} \to K^{-} π^{+} π^{+}$ to be $B (D^{+} \to K^{+} π^{-} π^{+}) / B (D^{+} \to K^{-} π^{+} π^{+}) = (7.7 \pm 1.7 \pm 0.8) \times 1 0^{- 3}$ . A Dalitz plot analysis was performed to search for resonant structures.

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