Core Concepts
The NISR matching procedure in the KKMChh Monte Carlo program effectively mitigates double-counting of QED radiation when using QED-corrected parton distribution functions (PDFs), leading to more accurate calculations of observables like the forward-backward asymmetry in muon pair production.
Stats
AFB calculated in five ranges of muon pair invariant mass (M𝜇−𝜇+): 89–93 GeV, 60–120 GeV, 60–81 GeV, 81–101 GeV, and 101–150 GeV.
Three cases were compared: (1) without NISR, (2) NISR at q0 = 2 GeV, and (3) NISR at the hard process scale.
MC samples with 8-10 billion weighted events were used.