The Strangest Proton?

Abstract

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 where available, 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.

arXiv commentVersion accepted for publication in EPJC. PDF sets available from http://nnpdf.mi.infn.it/nnpdf3-1strangeness/. v3: fixed typos

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• Impact of Lattice Strangeness Asymmetry Data in the CTEQ-TEA Global Analysis
• W+charm production with massive c quarks in PowHel
• A detailed investigation of W+c-jet at the LHC
• Machine learning of log-likelihood functions in global analysis of parton distributions
• Generalized parton distributions of sea quarks in the proton from nonlocal chiral effective theory
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Measurement of the production cross section for a W boson in association with a charm quark in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Final state radiation from high and ultrahigh energy neutrino interactions
• Mapping Parton Distributions of Hadrons with Lattice QCD
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• Determination of the parton distribution functions of the proton using diverse ATLAS data from $pp$ collisions at $\sqrt{s}=7$, 8 and 13 TeV
• Reinterpretation of proton strangeness between ATLAS and CMS measurements