Evidence for a Narrow Anti-Charmed Baryon State
H1 Collaboration
TL;DR
This paper reports the observation of a narrow resonance in electron-proton collisions at HERA, interpreted as an anti-charmed baryon with a specific quark composition, providing evidence for a new exotic state.
Contribution
First experimental evidence for a narrow anti-charmed baryon state in electron-proton collisions at HERA energies.
Findings
Resonance mass of approximately 3100 MeV
Resonance width of about 12 MeV
Interpretation as an anti-charmed baryon with quark content uuddcbar
Abstract
A narrow resonance in D*- p and D*+ pbar invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099 \pm 3 (stat.) \pm 5 (syst.) MeV and a measured Gaussian width of 12 \pm 3 (stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uuddcbar, together with the charge conjugate.
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