2015/08/31 by S. Alekhin, J. Blümlein, J. Bluemlein +3 · 1 citation
Physics and Astronomy · #Asymmetry #High-Energy Particle Collisions Research #Isospin #Large Hadron Collider #Lepton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quark #Tevatron #Top quark #hep-ph
paper · pdf · doi:10.1103/physrevd.94.114038
published as Phys. Rev. D 94, 114038 (2016) · 21 pages, 13 figures
arxiv created 2015/08/31 · openalex created_date 2016/06/24 · openalex publication_date 2016/12/30 · arxiv updated 2017/01/04 · openalex updated_date 2026/08/05
We present an improved determination of the up- and down-quark distributions in the proton using recent data on charged lepton asymmetries from W^\ifmmode±\else\textpm\fi gauge-boson production at the LHC and Tevatron. The analysis is performed in the framework of a global fit of parton distribution functions. The fit results are consistent with a nonzero isospin asymmetry of the sea, x(d\ensuremath-u), at small values of Bjorken x\ensuremath∼10^\ensuremath-4 indicating a delayed onset of the Regge asymptotics of a vanishing (d\ensuremath-u)-asymmetry at small x. We compare with up- and down-quark distributions available in the literature and provide accurate predictions for the production of single top-quarks at the LHC, a process which can serve as a standard candle for the light quark flavor content of the proton.