A Search for Neutral Baryon Resonances Below Pion Threshold

TL;DR

This study used high-resolution spectrometry to search for narrow neutral baryon resonances below the pion production threshold, but found no significant signals in the examined mass range.

Contribution

It provides the first high-resolution search for narrow neutral baryon resonances below the pion threshold with no observed signals.

Findings

No significant resonance signals detected.

Established upper limits on the yield ratio of potential resonances.

Achieved a missing mass resolution of 2.0 MeV.

Abstract

The reaction p(e,e^{prime}pi^+)X^0 was studied with two high resolution magnetic spectrometers to search for narrow baryon resonances. A missing mass resolution of 2.0 MeV was achieved. A search for structures in the mass region of 0.97 < M_{X^0} < 1.06 GeV yielded no significant signal. The yield ratio of p(e,e^{prime}pi^+)X^0/p(e,e^{prime}pi^+)n was determined to be (-0.35 +/- 0.35) times 10^{-3} at 1.004 GeV and (0.34 +/- 0.42) times 10^{-3} at 1.044 GeV.