Observation of Structure in Invariant-Mass Distributions fromνandν¯Interactions

Abstract

New data on the inelastic scattering of $\nu$ and $\overline{\nu }$ by nucleons show a significant excess of $\overline{\nu }$ events at large invariant mass ($W$), reflecting the high-$y$ anomaly and an enhancement in $\nu$ scattering centered at $W=2.2\mathrm{}\pm 0.3$ GeV with properties consistent with the production of new baryon states.