Search for Charmed Mesons and Baryons

Abstract

Data from a 15-GeV/c ${\pi }^{+}d$ experiment have been used to search for both short- and long-lived narrow resonances. No statistically significant high-mass narrow resonance has been observed up to a mass of 5 GeV. There is a single long-lived $V$ that remains unexplained. Cross-section limits (95% confidence level) of 0.7 μb for the long-lived possibility and 2 to 4 μb for the short-lived possibilities have been obtained.