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- Andrzej Buras, Stocchi D . Abbaneo, +95 authors Nobuyasu Yamada
- 2003

- J. A. Aguilar-Saavedra, Asem A. Ali, +93 authors S. Zhu
- 2005

High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when higher-order corrections are included. We propose such a scheme, Supersymmetry Parameter Analysis SPA, based on a consistent set of conventions and input parameters. A… (More)

- Benjamin C. Allanach, C. Balázs, +17 authors J. Lykken
- Computer Physics Communications
- 2009

The Supersymmetry Les Houches Accord (SLHA) [1] provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various generalisations: the minimal supersymmetric standard model with violation of CP,… (More)

- A. Ghinculov, T. Hurth, Gino Isidori, Y.-P. Yao
- 2002

We briefly discuss the status of the NNLL QCD calculations in the inclusive rare B decay B → Xs + −. Two important ingredients, the two-loop matrix elements of the four quark operator O2 and the bremsstrahlung contributions, were quite recently finalised. The new contributions significantly improve the sensitivity of the inclusive decay B → Xsl+l− decay in… (More)

- T. Hurth
- 1997

We analyze nonabelian massive Higgs-free theories in the causal Epstein-Glaser approach. Recently, there has been renewed interest in these models. In particular we consider the well-known Curci-Ferrari model and the nonabelian Stückelberg models. We explicitly show the reason why the considered models fail to be unitary. In our approach only the asymptotic… (More)

- T. Hurth, Kostas Skenderis
- 1997

We present a general method for constructing perturbative quantum field theories with global symmetries. We start from a free non-interacting quantum field theory with given global symmetries and we determine all perturbative quantum deformations assuming the construction is not obstructed by anomalies. The method is established within the causal… (More)

- Thomas Besmer, Christoph Greub, T. Hurth
- 2001

We investigate the constraints on the flavour violating parameters from the decay B → Xsγ, taking into account the interplay of the various sources of flavour violation in the unconstrained MSSM. We present a systematic leading logarithmic QCD analysis of these model-independent constraints, including contributions from gluinos, neutralinos, charginos,… (More)

- T. Hurth, Kostas Skenderis
- 1998

We review our recent work, hep-th/9803030, on the constraints imposed by global or local symmetries on perturbative quantum field theories. The analysis is performed in the Bogoliubov-Shirkov-Epstein-Glaser formulation of perturbative quantum field theory. In this formulation the S-matrix is constructed directly in the asymptotic Fock space with only input… (More)

The relation between the gauge-invariant local BRST cohomology involving the antifields and the gauge-fixed BRST cohomology is clarified. It is shown in particular that the cocycle conditions become equivalent once it is imposed, on the gauge-fixed side, that the BRST cocycles should yield deformations that preserve the nilpotency of the (gauge-fixed) BRST… (More)

- T. Hurth
- 1996

We present the causal construction of perturbative Yang-Mills theories in four(3+1)dimensional space-time. We work with free quantum fields throughout. The inductive causal method by Epstein and Glaser leads directly to a finite perturbation series and does not rely on an intermediary regularization of the theory. The causal method naturally separates the… (More)