تحلیل qcd توزیع پارتون ها بر اساس چند جمله ای های ژاکوبی: حالت غیر یکتا، تامرتبه nnlo

Tools for NNLO QCD Calculations

For precision studies with QCD observables at colliders, higher order perturbative corrections are often mandatory. For exclusive observables, like jet cross sections or differential distributions, these corrections were until recently only known to next-to-leading order (NLO) in perturbation theory. Owing to many new technical developments, first next-to-next-to-leading order (NNLO) QCD calcul...

Overview of Nnlo Qcd Corrections

We discuss the motivation for making predictions for jet cross sections at next-to-next-to-leading order. I describe the theoretical ingredients needed for such a calculation and briefly review the progress in the field. In the last decade there has been enormous progress in using perturbative QCD to predict and describe events containing jets. At the simplest lowest-order (LO) level, each jet ...

پیداکردن کران برای مقادیر ویژه چند جمله ای های ماتریسی

Status Report of NNLO QCD Calculations

We review recent progress in next-to-next-to-leading order (NNLO) perturbative QCD calculations with special emphasis on results ready for phenomenological applications. Important examples are new results on structure functions and jet or Higgs boson production. In addition, we describe new calculational techniques based on twistors and their potential for efficient calculations of multiparticl...

The Forward–backward Asymmetry in Nnlo Qcd

We have recently calculated the second-order QCD corrections to the forward–backward asymmetry in ee annihilation. Here we recall the results and compare them to others in the literature. RAL–TR–1999–048 CERN–TH/99–204 July 1999 Talk given by M. Seymour at 13th Rencontres de Physique de la Vallée d’Aoste, Results and Perspectives in Particle Physics, La Thuile, Aosta Valley, Italy, February 28t...

NNLO Time-like Splitting Functions in QCD

We review the status of the calculation of the time-like splitting functions for the evolution of fragmentation functions to the next-to-next-to-leading order in perturbative QCD. By employing relations between space-like and time-like deep-inelastic processes, all quark-quark and the gluon-gluon time-like splitting functions have been obtained to three loops. The corresponding quantities for t...