46 research outputs found
Sgluons in the same-sign lepton searches
In this work I present the interpretation of the ATLAS search of same-sign
lepton production in association with -jets in the context of the 4-top
quark signal from sgluon decays. I show that using just 3.2/fb data sample from
Run 2 the exclusion limit is already competitive with the Run 1 one. Public
data allow to exclude sgluons with masses up to 0.95 TeV. Prospects for the
total Run 2 integrated luminosity of 100/fb are briefly discussed.Comment: added missing ancillary materials, corrected error in scale variation
band in Fig. 3, added 1 new reference, updated Monte Carlo statistic
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
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
Ascertaining the spin for new resonances decaying into tau+ tau- at Hadron Colliders
Evidence of a new particle with mass ~125 GeV decaying into a pair of tau
leptons at the Large Hadron Collider spurs interest in ascertaining its spin in
this channel. Here we present a comparative study between spin-0 and spin-2
nature of this new particle, using spin correlations and decay product
directions. The TauSpinner algorithm is used to re-weight distributions from
qqbar -> gamma/Z -> tau+ tau- sample to simulate a spin-2 state exchange. The
method is based on supplementing the Standard Model matrix elements with those
arising from presence of a new interaction. Studies with simulated samples
demonstrate the discrimination power between these spin hypotheses based on
data collected at the Large Hadron Collider.Comment: 17 pages, 16 encapsulated postscript figure
Benchmarking the Inert Doublet Model for e+ e- colliders
We present benchmarks for the Inert Doublet Model, a Two Higgs Doublet Model
with a dark matter candidate. They are consistent with current constraints on
direct detection, including the most recent bounds from the XENON1T experiment
and relic density of dark matter, as well as with known collider and low-energy
limits. We focus on parameter choices that promise detectable signals at lepton
colliders via pair-production of H+H- and HA. For these we choose a large
variety of benchmark points with different kinematic features, leading to
distinctly different final states in order to cover the large variety of
collider signatures that can result from the model.Comment: 21 pages, 1 figure, 5 tables; v2: corresponds to published version.
Comments on future prospects adde