# Charm production in ep interaction at HERA and evidence for a narrow anti-charmed baryon state at H1

Source: [Charm production in ep interaction at HERA and evidence for a narrow anti-charmed baryon state at H1](<https://www.sota2.com/research/paper/68fa3a4e1e209131ce8c9b26>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T23:59:39.870Z

Authors: K. Lipka

Published: 2004-05-18T14:13:15.000Z

## Abstract

Recent results on open charm production at HERA are presented. Charm quarks are identified via the reconstruction of D-mesons. The charm contribution to the proton structure function is shown. Evidence for an exotic anti-charmed baryon state observed by H1 is presented. The data show a narrow resonance in the D\*p invariant mass combination at 3099+-3(stat)+-5(syst) MeV. The resonance is interpreted as an anti-charmed baryon with minimal constituent quark content uuddcbar together with its charge conjugate. Such a signal is not observed in a similar preliminary ZEUS analysis.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ex/0405051>)

[PDF](<https://arxiv.org/pdf/hep-ex/0405051.pdf>)