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- Zoltán Trócsányi
- 1993

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)

- Zoltán Trócsányi
- 1996

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 present a subtraction scheme for computing jet cross sections in electron-positron annihilation at next-to-next-to-leading order accuracy in perturbative QCD. In this first part we deal with the regularization of the doubly-real contribution to the NNLO correction.

- Gábor Somogyi, Zoltán Trócsányi, Vittorio Del Duca
- 2005

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.

- Zoltan Kunszt, Adrian Signer, Zoltán Trócsányi
- 1994

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 a subtraction scheme for computing jet cross sections in electron-positron annihilation at next-to-next-to-leading order accuracy in perturbative QCD. In this second part we deal with the regularization of the real-virtual contribution to the NNLO correction.

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)

- V Khachatryan, A M Sirunyan, +497 authors A P Singh
- 2010

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)

We present the next-to-leading order calculation of two four-jet event shape variables, the D parameter and acoplanarity differential distributions. We find large, more than 100 % radiative corrections. The theoretical prediction for the D parameter is compared to L3 data obtained at the Z 0 peak and corrected to hadron level.