NLO PDFs from the ABMP16 fit

We perform a global fit of parton distribution functions (PDFs) together with the strong coupling constant $$\alpha _s$$ and the quark masses $$m_c$$ , $$m_b$$ and $$m_t$$ at next-to-leading order (NLO) in QCD. The analysis applies the $$\overline{\mathrm {MS}}\, $$ renormalization scheme for $$\alpha _s$$ and all quark masses. It is performed in the fixed-flavor number scheme for $$n_f=3, 4, 5$$ and uses the same data as the previous ABMP16 fit at next-to-next-to-leading order (NNLO). The new NLO PDFs complement the set of ABMP16 PDFs and are to be used consistently with NLO QCD predictions for hard scattering processes. At NLO we obtain the value $$\alpha _s^{(n_f=5)}(M_Z) = 0.1191 \pm 0.0011$$ compared to $$\alpha _s^{(n_f=5)}(M_Z) = 0.1147 \pm 0.0008$$ at NNLO.

Перевод пока недоступен