Abstract
We consider determinations of the strange sea in the nucleon based on QCD analyses of data collected at the LHC with focus on the recent high-statistics ATLAS measurement of the W±- and Z-boson production. We study the effect of different functional forms for parameterization of the parton distribution functions and the combination of various data sets in the analysis. We compare to earlier strange sea determinations and discuss ways to improve them in the future.
Highlights
The precise knowledge of the light-quark content of proton is very important for phenomenological studies at the Large Hadron Collider (LHC)
QCD analyses of data from colliders and fixed-target experiments make this information available through the parton distribution functions (PDFs), which nowadays are accurate to next-to-next-to-leading order (NNLO) in perturbation theory [1]
An enhancement of the strange-sea was observed by ATLAS in an analysis of its data on the associated production of W±-bosons and a charm-quark [7], which were well described by its epWZ12 PDF set published in Ref. [5]
Summary
The precise knowledge of the light-quark content of proton is very important for phenomenological studies at the Large Hadron Collider (LHC). QCD analyses of data from colliders and fixed-target experiments make this information available through the parton distribution functions (PDFs), which nowadays are accurate to next-to-next-to-leading order (NNLO) in perturbation theory [1] It has been shown [2], that the recent LHC data on W±- and Z-boson production provide valuable constraints on the light-quark distributions for up, down and strange and help to improve the flavor separation. The ATLAS analysis, which has been published as the so-called epWZ16 set of PDFs [4], has obtained a strange-quark sea of a size comparable to the non-strange-quark ones in the kinematic range of Bjorken x ∼ 0.01 In this way, ATLAS has confirmed with better accuracy its earlier results [5] based on a smaller data sample [6]. In this way we can separate the impact of different effects on the strange sea determination and localize the origin of discrepancies
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