Zoltán Trócsányi

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One-loop corrections to the helicity amplitudes of all 2 → 2 subprocesses are calculated in QCD and in N=1 supersymmetric Yang-Mills theory using two versions of dimensional regularization: the 't Hooft-Veltman scheme and dimensional reduction. Studying the structure of the soft and collinear singularities, we found universal transition rules for the(More)
The next-to-leading order three-jet cross section in hadron collisions is calculated in the simplified case when the matrix elements of all QCD subprocesses are approximated by the pure gluon matrix element. The longitudinally-invariant k ⊥ jet-clustering algorithm is used. The important property of reduced renormalization and factorization scale dependence(More)
We describe how to disentangle the singly-and doubly-unresolved (soft and/or collinear) limits of tree-level QCD squared matrix elements. Using the factorization formu-lae presented in this paper, we outline a viable general subtraction scheme for computing next-to-next-to-leading order corrections for electron-positron annihilation into jets.
Singular terms of helicity amplitudes at one-loop in QCD and the soft limit of the cross sections of multi-parton processes Abstract We describe a general method that enables us to obtain all the singular terms of helicity amplitudes of n-parton processes at one loop. The algorithm uses helicity amplitudes at tree level and simple color algebra. We(More)
We present analytic expressions of all integrals required to complete the explicit evaluation of the real-virtual integrated counterterms needed to define a recently proposed subtraction scheme for jet cross sections at next-to-next-to-leading order in QCD. We use the Mellin-Barnes representation of these integrals in 4 − 2ǫ dimensions to obtain the(More)
Citation CMS Collaboration et al. " Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at $\sqrt{s} = 0.9 $ and 2.36 TeV. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Transverse-momentum and pseudorapidity distributions of charged hadrons in pp(More)
In previous articles we outlined a subtraction scheme for regularizing doubly-real emission and real-virtual emission in next-to-next-to-leading order (NNLO) calculations of jet cross sections in electron-positron annihilation. In order to find the NNLO correction these subtraction terms have to be integrated over the factorized unresolved phase space and(More)