Extracting sigma_effective from the LHCb double-charm measurement
arXiv:1308.6749
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.
21 pages, 1 figure