A Search for a Narrow Radial Excitation of the D*+/- Meson

TL;DR

This study searches for a specific narrow resonance of the D*'+/-(2629) meson in Z decays using OPAL data but finds no evidence, setting an upper limit on its production rate.

Contribution

The paper provides the first experimental search for the narrow D*'+/-(2629) meson resonance in Z decays and establishes an upper limit on its production.

Findings

No evidence for the D*'+/-(2629) resonance was observed.

An upper limit of 3.1 x 10^{-3} was set on the production rate.

The results constrain models predicting this meson’s production in Z decays.

Abstract

A sample of 3.73 million hadronic Z decays, recorded with the OPAL detector at LEP in the years 1991-95, has been used to search for a narrow resonance corresponding to the decay of the D*'+/-(2629) meson into D*+/- pi+ pi-. The D*+ mesons are reconstructed in the decay channel D*+ -> D0 pi+ with D0 -> K- pi+. No evidence for a narrow D*'+/-(2629) resonance is found. A limit on the production of D*'+/-(2629) in hadronic Z decays is derived: f(Z -> D*'+/-(2629)) x Br(D*'+ -> D*+ pi+ pi-) < 3.1 x 10^{-3} (95% C.L.)