Speaker
Herschel Chawdhry
(University of Cambridge)
Description
In perturbative Quantum Chromodynamics calculations, theoretical uncertainties are ascribed to ambiguities over the choice of the renormalisation scale, $\mu_R$. The BLM/PMC scale-setting procedure is one proposed method to remove this ambiguity. In this work, three ambiguities are identified in the BLM/PMC procedure itself and their numerical impact is studied using the example of the inclusive cross-section for $t\bar{t}$ production. One ambiguity is the arbitrary choice of the value of the highest-order PMC scale, $q_4$. The numerical impact of the choice of $q_4$ on the BLM/PMC prediction for the cross-section is found to be comparable to the impact of the choice of $\mu_R$ in the conventional scale-setting approach.
Primary authors
Dr
Alexander Mitov
(University of Cambridge)
Herschel Chawdhry
(University of Cambridge)