Speaker
Description
Achieving percent-level accuracy and precision in parton distribution functions (PDFs) requires a careful optimization of the theoretical and methodological ingredients entering their determination. In this talk, we present a multidimensional correlation study based on multiple CT25 PDF fits at NNLO in QCD, aimed at investigating and quantifying the correlations among the strong coupling $\alpha_s(M_Z)$, the top-quark pole mass $m_t$,and the gluon PDF parametrization. We perform ${\cal O}(100)$ simultaneous fits using optimized combinations of recent high-precision differential cross-section measurements for top-quark pair production at the LHC, and illustrate the individual roles of the parameters contributing to the observed multidimensional correlations to understand their effect on the resulting PDFs.
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