Extracting sigma_effective from the LHCb double-charm measurement
classification
✦ hep-ph
keywords
effectivecharmcrosslhcbopensigmabringscloser
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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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