1,929 research outputs found
Explanation of the ATLAS Z-peaked excess by squark pair production in the NMSSM
The ATLAS collaboration recently reported a excess in the
leptonic- channel. We intend to interpret this excess by
squark pair production in the Next-to-Minimal Supersymmetric Standard Model
(NMSSM). The decay chain we employ is , where and denote the
lightest and the next-to-lightest neutralinos with singlino and bino as their
dominant components respectively. Our simulations indicate that after
considering the constraints from the ATLAS searches for
signal the central value of the excess can be obtained for , and if the constraint from the CMS on- search is
further considered, more than 10 signal events are still attainable for
. Compared with the interpretation by
gluino pair production, the squark explanation allows for a significantly wider
range of as well as a less compressed SUSY mass spectrum. We
also show that the squark explanation will be readily tested at the initial
stage of the 14 TeV LHC.Comment: 19 pages, 4 figure
Explanation of the ATLAS Z-peaked excess in the NMSSM
Recently the ATLAS collaboration reported a excess in the
leptonic- channel. This may be interpreted in the
Next-to-Minimal Supersymmetric Standard Model (NMSSM) by gluino pair production
with the decay chain , where and denote the
lightest and the next-to-lightest neutralinos with singlino and bino as their
dominant components respectively. After exploring the relevant parameter space
of the NMSSM by considering the constraints from the ATLAS searches for signals, we conclude that the NMSSM is able to explain the excess
at level with the number of the signal events reaching its measured
central value in optimal cases, and the best explanation comes from a
compressed spectrum such as ,
and . We also check the consistency of the ATLAS results with the
null result of the CMS on- search. We find that under the CMS limits at
C.L., the event number of the ATLAS on- signal can still reach 11 in
our scenario, which is about away from the measured central value.Comment: 18 pages, 2 figure
Interpreting the galactic center gamma-ray excess in the NMSSM
In the Next-to-Minimal Supersymmetric Standard Model (NMSSM), all
singlet-dominated particles including one neutralino, one CP-odd Higgs boson
and one CP-even Higgs boson can be simultaneously lighter than about 100 GeV.
Consequently, dark matter (DM) in the NMSSM can annihilate into multiple final
states to explain the galactic center gamma-ray excess (GCE). In this work we
take into account the foreground and background uncertainties for the GCE and
investigate these explanations. We carry out a sophisticated scan over the
NMSSM parameter space by considering various experimental constraints such as
the Higgs data, -physics observables, DM relic desnity, LUX experiment and
the dSphs constraints. Then for each surviving parameter point we perform a fit
to the GCE spectrum by using the correlation matrix that incorporates both the
statistical and systematic uncertainties of the measured excess. After
examining the properties of the obtained GCE solutions, we conclude that the
GCE can be well explained by the pure annihilations and with being the lighter singlet-dominated CP-odd Higgs boson and
denoting the singlet-dominated CP-even Higgs boson or SM-like Higgs
boson, and it can also be explained by the mixed annihilation . Among these annihilation channels,
can provide the best
interpretation with the corresponding -value reaching 0.55. We also discuss
to what extent the future DM direct detection experiments can explore the GCE
solutions and conclude that the XENON-1T experiment is very promising in
testing nearly all the solutions.Comment: 31 pages, 7 figure
Interpreting the 750 GeV diphoton excess by the singlet extension of the Manohar-Wise Model
The evidence of a new scalar particle from the 750 GeV diphoton excess,
and the absence of any other signal of new physics at the LHC so far suggest
the existence of new colored scalars, which may be moderately light and thus
can induce sizable and couplings without resorting to
very strong interactions. Motivated by this speculation, we extend the
Manohar-Wise model by adding one gauge singlet scalar field. The resulting
theory then predicts one singlet dominated scalar as well as three kinds
of color-octet scalars, which can mediate through loops the and interactions. After fitting the model to the diphoton data at
the LHC, we find that in reasonable parameter regions the excess can be
explained at level by the process ,
and the best points predict the central value of the excess rate with
, which corresponds to a -value of . We also
consider the constraints from various LHC Run I signals, and we conclude that,
although these constraints are powerful in excluding the parameter space of the
model, the best points are still experimentally allowed.Comment: 19 pages, 3 figure
Psychological Stress Alters Ultrastructure and Energy Metabolism of Masticatory Muscle in Rats
To investigate the effects of psychological stress on the
masticatory muscles of rats, a communication box was applied to
induce the psychological stress (PS) in rats. The successful
establishment of psychological stimulation was confirmed by
elevated serum levels of adrenocorticotropic hormone (ACTH) and
changed behaviors in the elevated plusmaze apparatus. The energy
metabolism of the bilateral masseter muscles was tested via
chemocolorimetric analysis, whereas muscle ultrastructure was
assessed by electron microscopy. In comparison to the control
group, the PS group showed evidence of swollen mitochondria with
cristae loss and reduced matrix density in the masticatory muscles
after three weeks of stimulation; after five weeks of stimulation,
severe vacuolar changes to the mitochondria were observed.
Increased vascular permeability of the masticatory muscle
capillaries was found in the five-week PS rats. In addition, there
was decreased activity of Na+-K+ATPase and Ca2+-ATPase and a
simultaneous increase in the activity of lactate dehydrogenase and
lactic acid in the masticatory muscles of PS rats. Together, these
results indicate that psychological stress induces alterations in
the ultrastructure and energy metabolism of masticatory muscles in
rats
Quantum information masking of an arbitrary qudit can be realized in multipartite lower dimensional systems
Quantum information masking is a protocol that hides the original quantum
information from subsystems and spreads it over quantum correlation, which is
available to multipartite except bipartite systems. In this work, we explicitly
study the quantum information masking in multipartite scenario and prove that
all the k-level quantum states can be masked into a m-qudit systems (m > 4)
whose local dimension d < k and the upper bound of k is tighter than the
quantum Singleton bound. In order to observe the masking process intuitively,
explicitly controlled operations are provided. Our scheme well demonstrates the
abundance of quantum correlation between multipartite quantum system and has
potential application in the security of quantum information processing
Deviation analysis of rotational inertia measurement based on torsion bar method
The test of moment of inertia has a wide range of applications in aerospace, vehicle engineering, precision machinery, motors and other fields, moment of inertia directly affects the reliability and performance of components or equipment, it is very essential to test the moment of inertia. By analyzing the principle of moment of inertia test, we could come to the conclusion that the theoretical value, the inertia of the disk, the period of the torsion swing of the standard body and the period of the empty disk of the moment of inertia and the moment of inertia of the standard body. By analyzing the measurement error, position error and damping during the test, we could reach the following conclusion that the test accuracy of the moment of inertia can reach 0.1 %
From Decolonial to the Postcolonial: Trauma of an Unfinished Agenda
Expression stability of the candidate reference genes under different conditions. (DOCX 13Â kb
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