First Observation of the Decay D_s^+ to proton anti-neutron

TL;DR

This paper reports the first observation of a charmed meson decay into a baryon-antibaryon pair, specifically D_s^+ -> proton anti-neutron, with a measured branching fraction using data from the CLEO-c detector.

Contribution

It presents the first experimental observation of a D_s^+ meson decaying into a baryon-antibaryon final state, expanding understanding of charmed meson decay modes.

Findings

First observation of D_s^+ -> p anti-n decay

Measured branching fraction: (1.30 +- 0.36 +0.12 -0.16) x 10^-3

Demonstrates baryonic decay modes in charmed mesons

Abstract

Using e^+e^- -> D_s^*+ D_s^- data collected near the peak D_s production energy, E_cm=4170 MeV, with the CLEO-c detector, we present the first observation of the decay D_s^+ -> proton anti-neutron. We measure a branching fraction B(D_s^+ -> p anti-n = (1.30 +- 0.36 +0.12 -0.16) x 10^-3. This is the first observation of a charmed meson decaying into a baryon-antibaryon final state.