Publikationen | Hochschule Flensburg

2022

Precise calculation of the W boson pole mass beyond the standard model with FlexibleSUSY

Athron, P., Bach, M., Jacob, D. H. J., Kotlarski, W., Stöckinger, D., & Voigt, A. (2022). Precise calculation of the W boson pole mass beyond the standard model with FlexibleSUSY. Physical Review D, 106(9), 14. http://doi.org/10.1103/PhysRevD.106.095023 (Original work published November 2022)

Abstract

We present an updated calculation of the W boson pole mass in models beyond the standard model with FlexibleSUSY. The calculation has a decoupling behavior and allows for a precise W-pole mass prediction up to large new physics scales. We apply the calculation to several standard model extensions, including the MRSSM where we show that it can be compatible with large corrections to the W boson mass that would be needed to fit the recent 2022 CDF measurement.

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FlexibleDecay: An automated calculator of scalar decay widths

Athron, P., Büchner, A., Harries, D., Kotlarski, W., Stöckinger, D., & Voigt, A. (2022). FlexibleDecay: An automated calculator of scalar decay widths. Computer Physics Communications, 283, 27. http://doi.org/https://doi.org/10.1016/j.cpc.2022.108584 (Original work published Februar 2023)

Abstract

We present FlexibleDecay, a tool to calculate decays of scalars in a broad class of BSM models. The tool aims for high precision particularly in the case of Higgs boson decays. In the case of scalar and pseudoscalar Higgs boson decays the known higher order SM QED, QCD and EW effects are taken into account where possible. The program works in a modified MS scheme that exhibits a decoupling property with respect to heavy BSM physics, with BSM parameters themselves treated in the MS/DR-scheme allowing for an easy connection to high scale tests for, e.g., perturbativity and vacuum stability, and the many observable calculations readily available in MS/DR programs. Pure BSM effects are taken into account at the leading order, including all one-loop contributions to loop-induced processes. The program is implemented as an extension to FlexibleSUSY, which determines the mass spectrum for arbitrary BSM models, and does not require any extra configuration from the user. We compare our predictions for Higgs decays in the SM, singlet extended SM, type II THDM, CMSSM and MRSSM, as well as for squark decays in the CMSSM against a selection of publicly available tools. The numerical differences between our and other programs are explained. The release of FlexibleDecay officially deprecates the old effective couplings routines in FlexibleSUSY.