239 research outputs found
Charged Lepton Flavor Violation in the Semi-Constrained NMSSM with Right-Handed Neutrinos
We study the \mu \to e \gamma decay in the Z_3-invariant next-to-minimal
supersymmetric (SUSY) Standard Model (NMSSM) with superheavy right-handed
neutrinos. We assume that the soft SUSY breaking parameters are generated at
the GUT scale, not universally as in the minimal supergravity scenario but in
such a way that those soft parameters which are specific to the NMSSM can
differ from the soft parameters which involve only the MSSM fields while
keeping the universality at the GUT scale within the soft parameters for the
MSSM and right-handed neutrino fields. We call this type of boundary conditions
"semi-constrained". In this model, the lepton-flavor-violating off-diagonal
elements of the slepton mass matrix are induced by radiative corrections from
the neutrino Yukawa couplings, just like as in the MSSM extended with the
right-handed neutrinos, and these off-diagonal elements induce sizable rates of
\mu \to e \gamma depending on the parameter space. Since this model has more
free parameters than the MSSM, the parameter region favored from the Higgs
boson mass can slightly differ from that in the MSSM. We show that there is a
parameter region in which the \mu \to e \gamma decay can be observable in the
near future even if the SUSY mass scale is about 4 TeV.Comment: 16 pages, 3 figures. v2: reference added, typos corrected. v3: put
more emphasis on the difference from the MSSM + \nu_R model, reference added,
typos corrected, version to appear in Phys. Lett.
750 GeV Diphotons: Implications for Supersymmetric Unification II
Perturbative supersymmetric gauge coupling unification is possible in six
theories where complete SU(5) TeV-scale multiplets of vector matter account for
the size of the reported diphoton resonance, interpreted as a
singlet multiplet . One of these has a full generation of
vector matter and a unified gauge coupling . The diphoton
signal rate is enhanced by loops of vector squarks and sleptons, especially
when the trilinear couplings are large. If the coupling is
absent, both and can contribute to the resonance, which may then have a
large apparent width if the mass splitting from and arises from loops
of vector matter. The width depends sensitively on parameters and phases of
the vector squark and slepton masses. Vector quarks and/or squarks are expected
to be in reach of the LHC. If the coupling is present, leads to a
narrow diphoton resonance, while a second resonance with decays is likely to be discovered at future LHC runs. In some of the
theories a non-standard origin or running of the soft parameters is required,
for example involving conformal hidden sector interactions.Comment: 26 pages, 11 figure
750 GeV Diphotons: Implications for Supersymmetric Unification
A recent signal of 750 GeV diphotons at the LHC can be explained within the
framework of supersymmetric unification by the introduction of vector quarks
and leptons with Yukawa couplings to a singlet S that describes the 750 GeV
resonance. We study the most general set of theories that allow successful
gauge coupling unification, and find that these Yukawa couplings are severely
constrained by renormalization group behavior: they are independent of
ultraviolet physics and flow to values at the TeV scale that we calculate
precisely. As a consequence the vector quarks and leptons must be light;
typically in the region of 375 GeV to 700 GeV, and in certain cases up to 1
TeV. The 750 GeV resonance may have a width less than the experimental
resolution; alternatively, with the mass splitting between scalar and
pseudoscalar components of S arising from one-loop diagrams involving vector
fermions, we compute an apparent width of 10s of GeV.Comment: 10 pages, 6 figures; to appear in JHE
The Evolution of Provincial Bonapartism Prior to the Imperial Restoration : The Example of Antoine Gautier, Mayor of Bordeaux under the Authoritarian Empire
Retention properties with high-temperature resistance in (Bi,Pr)(Fe,Mn)O3 thin film capacitor
(Bi0.9Pr0.1)(Fe0.97Mn0.03)O3 (BPFM) thin film was deposited on Pt-coated Si(100) substrate by chemical solution deposition. Remnant polarization and coercive field in the BPFM film capacitor were 113 °C/cm2 and 630 kV/cm at the maximum electric field of 1000 kV/cm, respectively. Switching charge measured by a rectangular pulse measurement was 118 °C/cm2. Almost no polarization losses of BPFM film capacitor were observed even after retention time of 104 s at room temperature. Furthermore, the polarization loss at 450 °C was only 3.7% even after 104 s. These results indicate that BPFM film capacitor is suitable for non-volatile memory applications at high temperature. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Composite Models for the 750 GeV Diphoton Excess
We present composite models explaining the diphoton excess of mass around 750
GeV recently reported by the LHC experiments.Comment: 7 pages, 1 figure; matches the published versio
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