80 research outputs found
Decays of a bino-like particle in the low-mass regime
We study the phenomenology associated with a light bino-like neutralino with
mass under the tau mass in the context of the R-parity violating Minimal
Supersymmetric Standard Model. This is a well-motivated example of scenarios
producing potentially light and long-lived exotic particles, which might be
testable in far-detector experiments, such as the FASER experiment at the Large
Hadron Collider. A quantitative assessment of the discovery potential or the
extraction of limits run through a detailed understanding of the interactions
of the light exotic fermion with Standard Model matter, in particular, the
hadronic sector. Here, we propose a systematic analysis of the decays of such a
particle and proceed to a model-independent derivation of the low-energy
effects, so that this formalism may be transposed to other UV-completions or
even stand as an independent effective field theory. We then stress the
diversity of the possible phenomenology and more specifically discuss the
features associated with the R-parity violating supersymmetric framework, for
example neutron-antineutron oscillations.Comment: 50 pages, 5 figure
On the two-loop corrections to the Higgs mass in trilinear R-parity violation
We study the impact of large trilinear R-parity violating couplings on the
lightest CP-even Higgs boson mass in supersymmetric models. We use the publicly
available computer codes SARAH and SPheno to compute the leading two-loop
corrections. We use the effective potential approach. For not too heavy third
generation squarks (< 1 TeV) and couplings close to the unitarity bound we find
positive corrections up to a few GeV in the Higgs mass.Comment: 6 pages, 5 figure
Validity of the CMSSM interpretation of the diphoton excess
It has been proposed that the observed diphoton excess at 750 GeV could be
explained within the constrained minimal supersymmetric standard model via
resonantly produced stop bound states. We reanalyze this scenario critically
and extend previous work to include the constraints from the stability of the
electroweak vacuum and from the decays of the stoponium into a pair of Higgs
bosons. It is shown that the interesting regions of parameter space with a
light stop and Higgs of the desired mass are ruled out by these constraints.
This conclusion is not affected by the presence of the bound states because the
binding energy is usually very small in the regions of parameter space which
can explain the Higgs mass. Thus, this also leads to strong constraints on the
diphoton production cross section which is in general too small.Comment: 8 pages, 5 figures; v2: added Fig. 5, matches published versio
Searching for a Single Photon from Lightest Neutralino Decays in R-parity-violating Supersymmetry at FASER
In this work, we propose a search for a single photon at \texttt{FASER} and
\texttt{FASER2}, produced from decays of bino-like, sub-GeV lightest
neutralinos in the theoretical framework of the R-parity-violating (RPV)
Minimal Supersymmetric Standard Model (MSSM). We consider a list of
representative benchmark scenarios with one or two non-vanishing RPV couplings.
The photon has an energy
TeV. We find a
sensitivity reach for RPV couplings beyond the current bounds by orders of
magnitude at \texttt{FASER} and \texttt{FASER2}.Comment: 17 pages + references, 11 figures, 2 table
Sneutrino LSPs in R-parity violating minimal supergravity models
We consider the minimal supergravity model (mSUGRA) with one additional
R-parity violating operator at the GUT scale. The superparticles mass spectra
at the weak scale are generally altered due to the presence of the R-parity
violating coupling in the renormalization group equations. We show that a
lepton number violating coupling at the GUT scale can lead to a sneutrino as
the lightest supersymmetric particle (LSP) in a large region of parameter space
consistent with the muon anomalous magnetic moment and other precision
measurements. We also give characteristic collider signatures at the LHC.Comment: 3 pages, 3 figures, to appear in the proceedings of SUSY08, Seoul,
Kore
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