Minimisation strategies for the determination of parton density functions
نویسندگان
چکیده
منابع مشابه
Determination of the proton parton density functions at HERA
Recent experimental progress on the determination of the parton distribution functions in the proton from the H1 and ZEUS Collaborations at HERA is reported. New QCD fits yielding improved determinations of the parton distribution functions in the proton are described. On one hand, precise measurements of neutral-current deep inelastic scattering at low Q2 have allowed an improved determination...
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Unintegrated parton density functions (uPDFs) are best suited to study details of the hadronic final state in high energy ep and also in pp collisions (for a review see [1–7]). In general, the production cross section for jets, heavy quarks or gauge bosons can be written as a convolution of the uPDF A(x, k ⊥ , q̄) with the partonic off-shell cross section σ̂(xi, k 2 ⊥ ), with xi, k⊥ being the lon...
متن کاملDiffractive Parton Density Functions *
We discuss the perturbative QCD description of diffractive deep-inelastic scattering , and extract diffractive parton distributions from recent HERA data. The asymptotic collinear factorisation theorem has important modifications in the sub-asymptotic HERA regime. In addition to the usual resolved Pomeron contribution, the direct interaction of the Pomeron must also be accounted for. The diffra...
متن کاملDetermination of Parton Distribution Functions in Nuclei
Nuclear parton distribution functions are obtained by a χ 2 analysis of lepton deep inelastic experimental data. It is possible to determine valence-quark distributions at medium x and antiquark distributions at small x; however, the distributions in other x regions and gluon distributions cannot be fixed. We need a variety of experimental data and also further analysis refinements.
متن کاملDetermination of polarized parton distribution functions
We study parametrization of polarized parton distribution functions in the αs leading order (LO) and in the next-to-leading order (NLO). From χ fitting to the experimental data on A1, optimum polarized distribution functions are determined. The quark spin content ∆Σ is very sensitive to the small-x behavior of antiquark distributions which suggests that small-x data are needed for precise deter...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2018
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/1085/5/052007