2,365 research outputs found
One-Loop Anomaly Mediated Scalar Masses and (g-2)_mu in Pure Gravity Mediation
We consider the effects of non-universalities among sfermion generations in
models of Pure Gravity Mediation (PGM). In PGM models and in many models with
strongly stabilized moduli, the gravitino mass may be O(100) TeV, whereas
gaugino masses, generated through anomalies at 1-loop, remain relatively light
O(1) TeV. In models with scalar mass universality, input scalar masses are
generally very heavy (m_0 \simeq m_{3/2}) resulting in a mass spectrum
resembling that in split supersymmetry. However, if one adopts a no-scale or
partial no-scale structure for the K\"ahler manifold, sfermion masses may
vanish at the tree level. It is usually assumed that the leading order anomaly
mediated contribution to scalar masses appears at 2-loops. However, there are
at least two possible sources for 1-loop scalar masses. These may arise if
Pauli-Villars fields are introduced as messengers of supersymmetry breaking. We
consider the consequences of a spectrum in which the scalar masses associated
with the third generation are heavy (order m_{3/2}) with 1-loop scalar masses
for the first two generations. A similar spectrum is expected to arise in GUT
models based on E_7/SO(10) where the first two generations of scalars act as
pseudo-Nambu-Goldstone bosons. Explicit breaking of this symmetry by the gauge
couplings then generates one-loop masses for the first two generations. In
particular, we show that it may be possible to reconcile the g_mu - 2
discrepancy with potentially observable scalars and gauginos at the LHC.Comment: 30 pages, 30 figure
Upper Limit on the Proton Lifetime in Minimal Supersymetric SU(5)
In minimal supersymmetric SU(5) models, the proton can decay through
dimension 5 operators. Since this decay depends directly on the supersymmetric
soft masses, it will be constrained by other observables which depend on the
soft masses, such as the Higgs mass and the dark matter relic density. In this
work, we will examine the upper limit on the proton lifetime in minimal
supersymmetric SU(5) with constrained minimal supersymmetric (CMSSM) boundary
conditions set at the grand unification scale. We perform a random scan over
the variables of the (CMSSM), with of order points, and find that the
proton lifetime is within reach of JUNO and Hyper-Kamiokande's experiment.Comment: 6 pages, 3 figure
A 125GeV Higgs Boson and Muon g-2 in More Generic Gauge Mediation
Recently, the ATLAS and CMS collaborations reported exciting hints of a
Standard Model-like Higgs boson with a mass around 125GeV. A Higgs boson this
heavy is difficult to realize in conventional models of gauge mediation. Here
we revisit the lightest Higgs boson mass in "more generic gauge mediation,"
where the Higgs doublets mix with the messenger doublets. We show that a Higgs
boson mass around 125GeV can be realized in more generic gauge mediation
models, even for a relatively light gluino mass ~1TeV. We also show that the
muon anomalous magnetic moment can be within 1sigma of the experimental value
for these models, even when the Higgs boson is relatively heavy. We also
discuss the LHC constraints and the prospects of discovery.Comment: 28 pages, 7 figures. Corrections and references are adde
A CP-safe solution of the μ/Bμ problem of gauge mediation
AbstractWe construct a model that naturally generates μ and B of the same order without producing large CP violating phases. This is easily accomplished once one permits these mass scales to be determined independently of the ordinary gauge-mediated soft masses. The alignment of phases is shown to emerge dynamically upon coupling to supergravity and is not unique to the model presented here
W boson mass anomaly and grand unification
It is known that the recently reported shift of the W boson mass can be
easily explained by an triplet Higgs boson with a zero hypercharge if
it obtains a vacuum expectation value (VEV) of GeV. Surprisingly, the
addition of a TeV scale complex triplet Higgs boson to the standard model (SM)
leads to a precise unification of the gauge couplings at around GeV.
We consider that it is a consequence of grand unification and show a
possible potential for the Higgs fields yielding a weak scale complex
triplet scalar boson. Although it seems the proton decay constraint would doom
such a low-scale unification, we show that the constraint can be avoided by
introducing vector-like fermions which mix with the SM fermions through mass
terms involving the VEV of GUT breaking Higgs field. Importantly, the simplest
viable model only requires the addition of one pair of vector-like fermions
transforming and .Comment: 19 pages, 1 figure; references adde
Relatively Heavy Higgs Boson in More Generic Gauge Mediation
We discuss gauge mediation models where the doublet messengers and Higgs
doublets are allowed to mix through a "charged" coupling. The charged coupling
replaces messenger parity as a means of suppressing flavor changing neutral
currents without introducing any unwanted CP violation. As a result of this
mixing between the Higgs doublets and the messengers, relatively large A-terms
are generated at the messenger scale. These large A-terms produce a distinct
weak scale mass spectrum. Particularly, we show that the lightest Higgs boson
mass is enhanced and can be as heavy as 125GeV for a gluino mass as light as
2TeV. We also show that the stops are heavier than that predicted by
conventional gauge mediation models. It is also shown that these models have a
peculiar slepton mass spectrum.Comment: 17pages, 5 figures, revised versio
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