Excited B and D Mesons at OPAL

TL;DR

This paper reports on OPAL's spectroscopy studies of heavy-light mesons, including a search for D*+- radial excitations and measurements of B** meson branching ratios, providing new experimental limits and insights.

Contribution

It presents the first measurement of B** meson branching ratios involving B* and sets upper limits on D*+- radial excitation production.

Findings

No signal for narrow radial D*+- excitations was observed.

First measurement of B** branching ratios into B* final states.

Upper limit established for D*+- radial excitation production rate.

Abstract

Two recent OPAL publications dealing with spectroscopy of heavy-light mesons will be discussed. In the charm sector, a search for a narrow radial excitation of the D*+- is performed. No signal is seen, and an upper limit of the production rate of narrow radial excitations close to the predicted mass of 2.629 GeV is derived. Orbitally excited B** mesons are investigated in another analysis, where for the first time a measurement of their branching ratio into final states involving a B* is performed. Attempts are made to separate the B** signal into the four contributing resonances.