Determination of Strange Sea Quark Distributions from Fixed-target and   Collider Data
  We present an improved determination of the strange sea distribution in the nucleon with constraints coming from the recent charm production data in neutrino-nucleon deep-inelastic scattering by the NOMAD and CHORUS experiments and from charged current inclusive deep-inelastic scattering at HERA. We demonstrate that the results are consistent with the data from the ATLAS and the CMS experiments on the associated production of $W^\pm$-bosons with $c$-quarks. We also discuss issues related to the recent strange sea determination by the ATLAS experiment using LHC collider data. 
S. Alekhin, J. Bluemlein, L. Caminadac, K. Lipka, K. Lohwasser, S.   Moch, R. Petti, and R. Placakyte
hep-ph hep-ex