Supersymmetry inspired QCD beta function
نویسندگان
چکیده
We propose an all orders beta function for ordinary Yang-Mills theories with or without fermions inspired by the Novikov-Shifman-Vainshtein-Zakharov beta function of N 1⁄4 1 supersymmetric gauge theories. The beta function allows us to bound the conformal window. When restricting to one adjoint Weyl fermion we show how the proposed beta function matches the one of supersymmetric Yang-Mills theory. The running of the pure Yang-Mills coupling is computed and the deviation from the two loop result is presented. We then compare the deviation with the one obtained from lattice data also with respect to the two loop running.
منابع مشابه
Strings and Supersymmetry as Tools for Perturbative Qcd*
. We review techniques simplifying the analytic calculation of one-loop QCD amplitudes with many external legs, for use in next-to-leading-order corrections to multi-jet processes. We explain how a supersymmetry-inspired organization works well in conjunction with other tools, namely the color and helicity decompositions of amplitudes, and the constraints imposed by perturbative unitarity and c...
متن کاملSmall SUSY phases in string-inspired supergravity
In supersymmetric models, there are new CP violating phases which, if unsuppressed, would give a too large neutron electric dipole moment. We examine the possibility of small SUSY phases in string-inspired supergravity models in which supersymmetry is broken by the auxiliary components of the dilaton and moduli superfields. It is found that the SUSY phases can be suppressed by a small factor go...
متن کاملEfficient Analytic Computation of Higher-order Qcd Amplitudes * 1. Total Quantum-number Management
We review techniques simplifying the analytic calculation of one-loop QCD amplitudes with many external legs, for use in next-to-leading-order corrections to multi-jet processes. Particularly useful are the constraints imposed by perturba-tive unitarity, collinear singularities and a supersymmetry-inspired organization of helicity amplitudes. Certain sequences of one-loop helicity amplitudes wi...
متن کاملSupersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling Shifts
We present a definition of the four-dimensional helicity (FDH) regularization scheme valid for two or more loops. This scheme was previously defined and utilized at one loop. It amounts to a variation on the standard ’t Hooft-Veltman scheme and is designed to be compatible with the use of helicity states for “observed” particles. It is similar to dimensional reduction in that it maintains an eq...
متن کاملFe b 19 99 Quark confinement in MSSM QCD as a consequence of supersymmetry and instanton effects
Quark confinement in MSSM QCD as a consequence of supersymmetry and instanton effects. Abstract It is shown, that instanton effects naturally produce quark confinement in MSSM QCD. The confinement scale, calculated from the first principles, is in a good agreement with the experimental data. The proposed explanation is quite different from the dual Higgs mechanism.
متن کامل