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First observation of the decay Ds+-->pn.

S B Athar¹, R Patel, J Yelton

¹University of Florida, Gainesville, Florida 32611, USA.

Physical Review Letters

|June 4, 2008

Summary

Researchers observed the first decay of a charmed meson, the D s plus (Ds+), into a proton-antiproton (p-pbar) final state. This groundbreaking finding expands our understanding of particle physics and rare meson decays.

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Area of Science:

Particle Physics
High Energy Physics
Hadron Spectroscopy

Background:

Charmed mesons, like the D s plus (Ds+), are fundamental particles in the Standard Model.
Understanding their decay modes provides crucial insights into fundamental forces and particle interactions.
Previous studies have not documented the decay of Ds+ into a baryon-antibaryon pair.

Purpose of the Study:

To report the first observation of the decay Ds+ --> p-pbar.
To measure the branching fraction for this novel decay mode.
To contribute to the understanding of charmed meson decays.

Main Methods:

Data analysis from e+e- collisions collected by the CLEO-c detector.
Reconstruction of the Ds+ meson near its production energy peak (Ecm=4170 MeV).
Identification and selection of the proton-antiproton (p-pbar) final state.

Main Results:

First experimental observation of the decay channel Ds+ --> p-pbar.
Measured branching fraction B(Ds+ --> p-pbar) = (1.30 ± 0.36 (stat.) +0.12/-0.16 (syst.)) x 10^-3.
This represents the first instance of a charmed meson decaying into a baryon-antibaryon final state.

Conclusions:

The observation of Ds+ --> p-pbar enriches the known decay modes of charmed mesons.
This finding provides a new avenue for studying the dynamics of weak interactions in heavy quark systems.
Further theoretical and experimental work is warranted to explore this decay in detail.