HERA Anomaly and Hard Charm in the Nucleon

A.W. Thomas (U. Adelaide); W. Melnitchouk (U. Maryland)

HERA Anomaly and Hard Charm in the Nucleon

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arxiv hep-ph/9707387 v2 pith:FVQ7CGBQ submitted 1997-07-18 hep-ph nucl-th

W. Melnitchouk (U. Maryland) , A.W. Thomas (U. Adelaide) This is my paper · ORCID

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keywords charmheraanomalyhardnucleonaccountarisec-bar

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We explore the possibility that the excess neutral and charged current events seen by the H1 and ZEUS Collaborations at HERA at large x and Q^2 could arise from a hard charm component of the nucleon. While the symmetric intrinsic charm hypothesis is unable to account for the HERA anomaly, a non-symmetric charm distribution generated non-perturbatively, for which c-bar is much harder than c, can produce significant enhancement of cross sections at the HERA kinematics.

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First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints
hep-ph 2025-10 conditional novelty 6.0 of 10

First simultaneous pion+kaon PDF fit with lattice constraints finds kaon valence anti-up softer than pion's and strange valence more peaked at high x.

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