The first results on next-to-leading order QCD corrections to production of two Z bosons in hadronic collisions in the large extra dimension ADD model are presented.Various kinematical distributions are obtained to order α s in QCD by taking into account all the parton level subprocesses. We estimate the impact of the QCD corrections on various observables and find that they are significant. We also show the reduction in factorization scale uncertainty when O(α s ) effects are included.
Correlators of Wilson-line operators are fundamental ingredients for the study of the infrared properties of non-abelian gauge theories. In perturbation theory, they are known to exponentiate, and their logarithm can be organised in terms of collections of Feynman diagrams called webs. We study the classification of webs to high perturbative orders, proposing a set of tools to generate them recursively: in particular, we introduce the concept of Cweb, or correlator web, which is a set of skeleton diagrams built with connected gluon correlators, instead of individual Feynman diagrams. As an application, we enumerate all Cwebs entering the soft anomalous dimension matrix for multi-parton scattering amplitudes at four loops, and we compute the mixing matrices for all Cwebs connecting four or five Wilson lines at that loop order, verifying that they obey sum rules that were derived or conjectured in the literature. Our results provide the colour building blocks for the calculation of the soft anomalous dimension matrix at four-loop order.
We present next-to-leading order QCD corrections to production of two W bosons in hadronic collisions in the extra dimension ADD model. Invariant mass and rapidity distributions are obtained to order α s in QCD by taking into account all the parton level subprocesses. The computation is organized using the monte carlo based method of phase space slicing. We estimate the impact of the QCD corrections on various observables and find that they are significant. We present some results for a 10 T eV LHC but most of the results presented here are for 14 T eV LHC. We also show the reduction in factorization scale uncertainty when O(α s ) effects are included.
We present next-to-leading order QCD corrections to production of two W bosons at the LHC in the Randall-Sundrum model. Various kinematical distributions are obtained to order α s in QCD by taking into account all the parton level subprocesses. We estimate the impact of the QCD corrections on various observables and find that they are significant.We also show the reduction in factorization scale uncertainty when O(α s ) effects are included.
Event shapes are classical tools for the determination of the strong coupling and for the study of hadronization effects in electron-positron annihilation. In the context of analytical studies, hadronization corrections take the form of power-suppressed contributions to the cross section, which can be extracted from the perturbative ambiguity of Borel-resummed distributions. We propose a simplified version of the well-established method of Dressed Gluon Exponentiation (DGE), which we call Eikonal DGE (EDGE), which determines all dominant power corrections to event shapes by means of strikingly elementary calculations. We believe our method can be generalized to hadronic event shapes and jet shapes of relevance for LHC physics.
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