Conveners
Parallel 10
- Johann Kühn (KIT)
Parallel 10
- Johann Kühn (KIT)
We calculate the two-loop coefficient functions for the vector and axial-vector flavor-nonsinglet contribution to deeply-virtual Compton scattering (DVCS) using the approach based on conformal symmetry. We present the analytic expressions for the coefficient functions in momentum fraction space. The calculated NNLO corrections prove to be rather large and have to be taken into account.
In the context of infrared subtraction algorithms beyond next-to-leading order, it
becomes necessary to consider multiple infrared limits of scattering amplitudes, in which
several particles become soft or collinear in a strongly ordered sequence. We study these
limits from the point of view of infrared factorisation, and we provide general definitions of
strongly-ordered soft and...
We calculate non-singlet quark operator matrix elements of deep-inelastic scattering in the chiral limit including operators with total derivatives. This extends previous calculations with zero-momentum transfer through the operator vertex which provides the well-known anomalous dimensions for the evolution of parton distributions, as well as calculations in off-forward kinematics utilizing...
In BSM models often many choices for the renormalization scheme (RS) for the BSM particles (masses and mixings) are possible. Several of them lead to numerically unstable results. However, for a given parameter point in a BSM model it is a priori not known which RS leads to stable results, which makes the implementation of higher-order corrections in BSM models into automated codes...
Obtaining precise theoretical predictions for both production and decay processes of heavy new particles is of great importance to constrain the allowed parameter space of BSM models and to properly assess the sensitivity for discoveries and for discriminating between different possible BSM scenarios.
In this context, it is well known that large logarithmic corrections can appear in the...
Although the advanced concepts and techniques of perturbative QFT still apply to models with extended Higgs sectors, new issues arise, such as the question about phenomenoligically sound renormalization and input-parameter schemes, which fulfill desirable theoretical requirements (gauge invariance, perturbative stability, symmetries, simplicity, etc.), which are prerequisites for a...
