Jiří Chýla (Praha):
Does the choice of scales matter at the LHC?
For a number of interesting physical quantities measured at
HERA and TEVATRON the ambiguities resulting from the freedom in the choice of the renormalization
and factorization scales prevent us from drawing clear conclusions on the presence of signals of new
physics, like the BFKL dynamics. One might hope that at much higher energies available at the
LHC perturbative QCD predictions will be much more stable. In this talk I will argue that this is not
always the case and that the problem of scale setting may hinder even such important and seemingly
clean observables like the ttbar production cross section.
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