The Strangest Proton?

Ferran Faura, Shayan Iranipour, Emanuele R. Nocera, Juan Rojo, Maria Ubiali

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We present an improved determination of the strange quark and anti-quark parton distribution functions of the proton by means of a global QCD analysis that takes into account a comprehensive set of strangeness-sensitive measurements: charm-tagged cross sections for fixed-target neutrino-nucleus deep-inelastic scattering, and cross sections for inclusive gauge-boson production and $W$-boson production in association with light jets or charm quarks at hadron colliders. Our analysis is accurate to next-to-next-to leading order in perturbative QCD and specifically includes charm-quark mass corrections to neutrino-nucleus structure functions. We find that a good overall description of the input dataset can be achieved and that a strangeness moderately suppressed in comparison to the rest of the light sea quarks is strongly favored by the global analysis.
Original languageEnglish
Article number1168
Pages (from-to)1-17
Number of pages17
JournalEuropean Physical Journal C. Particles and Fields
Issue number12
Publication statusPublished - 19 Dec 2020

Bibliographical note

5 pages + supplementary material, 13 figures, PDF sets available from


  • hep-ph
  • hep-ex
  • hep-lat
  • nucl-th


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