The total top-pair production cross section at NNLL

Abstract

We present results for the total top-pair production cross section at the Tevatron and the LHC. Our predictions supplement fixed-order results with resummation of soft logarithms and Coulomb singularities to next-to-next-to-leading (NNLL) logarithmic accuracy and include top-antitop bound-state effects. The effects of resummation, the dependence on the PDF set used, the residual sources of theoretical uncertainty and their implication for measurements of the top-quark mass are discussed.

Self-consistence of the Standard Model via the renormalization group analysis

“…(15), but the theoretical uncertainty is much larger. Similar analyses (direct extraction of the pole mass of top-quark from measured total cross section) have been performed by a few other groups [58,[61][62][63][64] with the following results:…”

Sommerfeld effect in heavy quark chemical equilibration

“…where f F denotes the Fermi distribution. Expanding in a small ω, 12) and omitting exponentially small terms, the coefficient of eq. (2.9) is readily extracted:…”

“…refs. [12,13,14] for recent work and references). It may also play an important role in the indirect detection of dark matter particles [15].…”

Top Quark Production @ Tevatron.

“…The latest theoritical prediction shows that top quark pair production is 7.22 +0.31 -0.34 (total theoritical) +0.71 -0.55 (PDF+ s ) pb at S = 1.96 TeV based on Next to Next Leading Logrithmic (NNLL) [5]. The fraction of quark anti-quark annihilation and gluon gluon fusion are estmated to be 90% and 10%, respectively.…”