Extracting sigmaeffective from the LHCb double-charm measurement
Abstract
We discuss various issues related to the definition of single and double open charm cross sections. We conclude that LHCb's extraction of sigmaeffective, 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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