Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-22
Eur.Phys.J.C40:145-156,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 4 figures; expanded version for publication
Scientific paper
10.1140/epjc/s2004-02099-4
We have performed the first global QCD analysis to include the CCFR and NuTeV dimuon data, which provide direct constraints on the strange and anti-strange parton distributions, $s(x)$ and $\bar{s}(x)$. To explore the strangeness sector, we adopt a general parametrization of the non-perturbative $s(x), \bar{s}(x)$ functions satisfying basic QCD requirements. We find that the strangeness asymmetry, as represented by the momentum integral $[S^{-}]\equiv \int_0^1 x [s(x)-\bar{s}(x)] dx$, is sensitive to the dimuon data provided the theoretical QCD constraints are enforced. We use the Lagrange Multiplier method to probe the quality of the global fit as a function of $[S^-]$ and find $-0.001 < [S^-] < 0.004$. Representative parton distribution sets spanning this range are given. Comparisons with previous work are made.
Huston Joey
Kretzer Stefan
Lai Hung-Liang
Nadolsky Pavel
Olness Fred
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