H1 collaboration compares data to dipole-based entanglement entropy

Researchers are drawing a direct line between high-energy physics data and quantum information theory by comparing measurements of hadron multiplicities from the H1 collaboration to entanglement entropy calculated using a QCD dipole cascade model. This work establishes a connection by proposing that entanglement entropy arises in deep inelastic scattering due to a trace over unobserved color degrees of freedom, yielding a quantifiable measure through dipole multiplicities. Unlike previous studies, this research incorporates both transverse-size and azimuthal-angle dependence in the dipole evolution kernel, offering a more complete model of entanglement in these interactions. The team’s analysis of the double leading-logarithmic approximation (DLLA) solution revealed that it generates a larger entanglement entropy for the same initial dipole size, suggesting a sensitivity of entanglement measures to the specific approximation used in QCD calculations. A surprising…