Determination of the strange-quark density of the proton from ATLAS measurements of the w -> lv and z -> ll cross sections
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KünyeAad, G, Abbott, B., Abdallah, J., Abdelalim, A.A., Abdesselam, A., Abdinov, O. ... ATLAS Collaboration. (2012). Determination of the strange-quark density of the proton from ATLAS measurements of the w -> lv and z -> ll cross sections. Physical Review Letters, 109 (1), 17p. http://dx.doi.org/10.1103/PhysRevLett.109.012001.
AQCD analysis is reported of ATLAS data on inclusive W-+/- and Z boson production in pp collisions at the LHC, jointly with ep deep-inelastic scattering data from HERA. The ATLAS data exhibit sensitivity to the light quark sea composition and magnitude at Bjorken x similar to 0:01. Specifically, the data support the hypothesis of a symmetric composition of the light quark sea at low x. The ratio of the strange-to-down sea quark distributions is determined to be 1:00(-0:28)(+0.25) at absolute four-momentum transfer squared Q(2) = 1: 9 GeV2 and x = 0: 023.