Extracting sigma_effective from the LHCb double-charm measurement
Michael H. Seymour, Andrzej Siodmok (University of Manchester)
TL;DR
This paper analyzes the LHCb double-charm measurement, identifying an overestimation in the effective cross section for double-parton scattering and proposing a correction to align it with related measurements.
Contribution
It provides a critical reassessment of the sigma_effective value from LHCb, correcting its magnitude and improving consistency across different charm production data.
Findings
LHCb's sigma_effective is overestimated by a factor of two.
Correcting sigma_effective aligns double-charm data with other charm production measurements.
The correction enhances the understanding of double-parton scattering in proton-proton collisions.
Abstract
We discuss various issues related to the definition of single and double open charm cross sections. We conclude that LHCb's extraction of sigma_effective, the effective cross section for double-parton scattering, is too large by a factor of two. This correction brings the data from open-charm pairs closer to that from J/psi plus open charm and jet production.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · High-Energy Particle Collisions Research · Quantum Chromodynamics and Particle Interactions