18 research outputs found
Precise prediction for the W boson mass in the MRSSM
The mass of the W boson, , plays a central role for high-precision tests
of the electroweak theory. Confronting precise theoretical predictions with the
accurately measured experimental value provides a high sensitivity to quantum
effects of the theory entering via loop contributions. The currently most
accurate prediction for the W boson mass in the Minimal R-symmetric
Supersymmetric Standard Model (MRSSM) is presented. Employing the on-shell
scheme, it combines all numerically relevant contributions that are known in
the Standard Model (SM) in a consistent way with all MRSSM one-loop
corrections. Special care is taken in the treatment of the triplet scalar
vacuum expectation value that enters the prediction for already at
lowest order. In the numerical analysis the decoupling properties of the
supersymmetric loop contributions and the comparison with the MSSM are
investigated. Potentially large numerical effects of the MRSSM-specific
superpotential couplings are highlighted. The comparison with
existing results in the literature is discussed.Comment: 35 pages, 9 figures; Updated to JHEP version with minor change
Squark production in R-symmetric SUSY with Dirac gluinos: NLO corrections
R-symmetry leads to a distinct realisation of SUSY with a significantly
modified coloured sector featuring a Dirac gluino and a scalar colour octet
(sgluon). We present the impact of R-symmetry on squark production at the 13
TeV LHC. We study the total cross sections and their NLO corrections from all
strongly interacting states, their dependence on the Dirac gluino mass and
sgluon mass as well as their systematics for selected benchmark points. We find
that tree-level cross sections in the R-symmetric model are reduced compared to
the MSSM but the NLO K-factors are generally larger in the order of ten to
twenty per cent. In the course of this work we derive the required DREG
DRED transition counterterms and necessary on-shell renormalisation constants.
The real corrections are treated using FKS subtraction, with results cross
checked against an independent calculation employing the two cut phase space
slicing method.Comment: 46 pages, 15 figures; updated to match published versio
Two-loop correction to the Higgs boson mass in the MRSSM
We present the impact of two-loop corrections on the mass of the lightest
Higgs boson in the Minimal R-symmetric Supersymmetric Standard Model (MRSSM).
These shift the Higgs boson mass up by typically 5 GeV or more. The dominant
corrections arise from strong interactions, from the gluon and its N=2
superpartners, the sgluon and Dirac gluino, and these corrections further
increase with large Dirac gluino mass. The two-loop contributions governed
purely by Yukawa couplings and the MRSSM parameters are
smaller. We also update an earlier analysis [Diessner:2014ksa], which showed
that the MRSSM can accommodate the measured Higgs and W boson masses. Including
the two-loop corrections increases the parameter space where the theory
prediction agrees with the measurement.Comment: To be submitted to "Supersymmetry beyond the NMSSM", Advances in High
Energy Physic
Higgs boson mass and electroweak observables in the MRSSM
R-symmetry is a fundamental symmetry which can solve the SUSY flavor problem
and relax the search limits on SUSY masses. Here we provide a complete
next-to-leading order computation and discussion of the lightest Higgs boson
mass, the W boson mass and muon decay in the minimal R-symmetric SUSY model
(MRSSM). This model contains non-MSSM particles including a Higgs triplet,
Dirac gauginos and higgsinos, and leads to significant new tree-level and
one-loop contributions to these observables. We show that the model can
accommodate the measured values of the observables for interesting regions of
parameter space with stop masses of order 1 TeV in spite of the absence of stop
mixing. We characterize these regions and provide typical benchmark points,
which are also checked against further experimental constraints. A detailed
exposition of the model, its mass matrices and its Feynman rules relevant for
computations in this paper is also provided.Comment: added references, matches the published versio
橘の花散る里のほととぎす--「万葉集」巻8,1472,1473番歌をめぐって
R-symmetry leads to a distinct low energy realisation of SUSY with a signicantly modified colour-charged sector featuring a Dirac gluino and scalar colour octets (sgluons). In the present work we recast results from LHC BSM searches to discuss the impact of R-symmetry on the squark and gluino mass limits. We work in the framework of the Minimal R-symmetric Supersymmetric Standard Model and take into account the NLO corrections to the squark production cross sections in the MRSSM that have become available recently. We find substantially weaker limits on squark masses compared to the MSSM: for simple scenarios with heavy gluinos and degenerate squarks, the MRSSM mass limit is > 1:7TeV, approximately 600 GeV lower than in the MSSM
Strongly interacting states in R-symmetric SUSY at the LHC
Experimental limits on the masses of SUSY states from searches at the LHC are becoming quite stringent, especially for the mass of the gluino of the MSSM. The MRSSM is an alternative supersymmetric model which features an continuous R-symmetry and it leads to a Dirac-type gluino. Compellingly, it is natural for a Dirac gluino to have a large mass outside the current bounds. For an accurate prediction of the production strongly interacting SUSY states at the LHC next-to leading order corrections are relevant and need to be considered. This has not yet been done for the case of Dirac gluinos and it is our goal to remedy this for the MRSSM. In this talk I will present our progress of calculating the NLO SUSY-QCD corrections in the MRSSM for the production at the LHC. Special emphasis will be put on the differences between the MSSM and the MRSSM