Steps towards NNLO QCD calculations: collinear factorization at ″(αS2)
نویسندگان
چکیده
منابع مشابه
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...
متن کاملSteps towards the QCD calculation for e + e − → 3 jets at NNLO
High precision analyses of experimental data for e+e− annihillation, such as determination of jet rates or event shape observables, call for complete next-to-next-toleading order (NNLO) perturbative QCD predictions. In this talk, we discuss the various ingredients entering the calculation of the NNLO corrections in e+e− annihillation.
متن کاملStatus 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...
متن کاملar X iv : h ep - p h / 99 05 38 5 v 1 1 8 M ay 1 99 9 1 Steps towards NNLO QCD calculations : collinear factorization at O ( α 2 S ) ∗
The properties of QCD in the soft and collinear limits play an important role in doing higher order calculations. The singularities arising in these limits prevents a straightforward integration of matrix elements to obtain physical cross sections. However, as far as NLO calculations are concerned, the universality property of these singularities provided a method to solve these problems. The s...
متن کاملNested soft-collinear subtractions in NNLO QCD computations
We discuss a modification of the next-to-next-to-leading order (NNLO) subtraction scheme based on the residue-improved sector decomposition that reduces the number of double-real emission sectors from five to four. In particular, a sector where energies and angles of unresolved particles vanish in a correlated fashion is redundant and can be discarded. This simple observation allows us to formu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1999
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(99)00747-1