292 research outputs found
Theoretical constraints on masses of heavy particles in Left-Right Symmetric Models
Left-Right symmetric models with general gauge couplings which
include bidoublet and triplet scalar multiplets are studied. Possible scalar
mass spectra are outlined by imposing Tree-Unitarity, and Vacuum Stability
criteria and also using the bounds on neutral scalar masses
which assure the absence of Flavour Changing Neutral Currents (FCNC). We are
focusing on mass spectra relevant for the LHC analysis, i.e., the scalar masses
are around TeV scale. As all non-standard heavy particle masses are related to
the vacuum expectation value (VEV) of the right-handed triplet (), the
combined effects of relevant Higgs potential parameters and
regulate the lower limits of heavy gauge boson masses. The complete set of
Renormalization Group Evolutions for all couplings are provided at the 1-loop
level, including the mixing effects in the Yukawa sector. Most of the scalar
couplings suffer from the Landau poles at the intermediate scale GeV, which in general coincides with violation of the Tree-Unitarity
bounds.Comment: 9 pages, 5 figures, pdflatex, Matches published versio
Left-Right Symmetry and the Charged Higgs Bosons at the LHC
The charged Higgs boson sector of the Minimal Manifest Left-Right Symmetric
model (MLRSM) is investigated in the context of LHC discovery search for new
physics beyond Standard Model. We discuss and summarise the main processes
within MLRSM where heavy charged Higgs bosons can be produced at the LHC. We
explore the scenarios where the amplified signals due to relatively light
charged scalars dominate against heavy neutral and charged gauge as
well as heavy neutral Higgs bosons signals which are dumped due to large vacuum
expectation value of the right-handed scalar triplet. In particular,
production processes with one and two doubly charged Higgs bosons are
considered. We further incorporate the decays of those scalars leading to multi
lepton signals at the LHC. Branching ratios for heavy neutrino , and
decay into charged Higgs bosons are calculated. These effects are
substantial enough and cannot be neglected. The tri- and four-lepton final
states for different benchmark points are analysed. Kinematic cuts are chosen
in order to strength the leptonic signals and decrease the Standard Model (SM)
background. The results are presented using di-lepton invariant mass and
lepton-lepton separation distributions for the same sign (SSDL) and opposite
sign (OSDL) di-leptons as well as the charge asymmetry are also discussed. We
have found that for considered MLRSM processes tri-lepton and four-lepton
signals are most important for their detection when compared to the SM
background. Both of the signals can be detected at 14 TeV collisions at the LHC
with integrated luminosity at the level of with doubly charged
Higgs bosons up to approximately 600 GeV. Finally, possible extra contribution
of the charged MLRSM scalar particles to the measured Higgs to di-photon
() decay is computed and pointed out.Comment: FCNC analysis is incorporated while fitting the scalar spectrum.
Light doubly charged scalars are still compatible with FCNC. Accepted in
JHEP. New References and figures are added. The fitted scalar spectrum is
given in detail in appendi
Multi-photon signal in supersymmetry comprising non-pointing photon(s) at the LHC
We study a distinct supersymmetric signal of multi-photons in association
with jets and missing transverse energy. At least one of these photons has the
origin in displaced vertex, thus delayed and non-pointing. We consider a
supersymmetric scenario in which the gravitino is the lightest supersymmetric
particle (LSP) (with a mass ) and the lightest neutralino is the
next-to-lightest supersymmetric particle (NLSP). The NLSP decays dominantly
into a photon and a gravitino within the detector with a decay length ranging
from 50-100 cm. In addition, we assume that the
second lightest neutralino and the lightest neutralino are nearly degenerate
and this leads to a prompt radiative decay of the next-to-lightest neutralino
into a photon and a lightest neutralino with a large branching ratio. Such
degenerate neutralinos can be realised in various representations of the
, , and Grand Unified Theories (GUTs). The non-pointing
photons can be reconstructed at the electromagnetic calorimeter of the ATLAS
inner-detector, which have been designed with good timing and directional
resolution. We find that with a centre-of-mass energy at an
integrated luminosity of 100 one may see evidence of hundreds of
tri-photon events and a few four-photons events at the LHC, in addition to
several thousands di-photon events. We also predict the event rates even at the
early phase of LHC run.Comment: 10 pages; 6 figure
Evolutionary framework with reinforcement learning-based mutation adaptation
Although several multi-operator and multi-method approaches for solving optimization problems have been proposed, their performances are not consistent for a wide range of optimization problems. Also, the task of ensuring the appropriate selection of algorithms and operators may be inefficient since their designs are undertaken mainly through trial and error. This research proposes an improved optimization framework that uses the benefits of multiple algorithms, namely, a multi-operator differential evolution algorithm and a co-variance matrix adaptation evolution strategy. In the former, reinforcement learning is used to automatically choose the best differential evolution operator. To judge the performance of the proposed framework, three benchmark sets of bound-constrained optimization problems (73 problems) with 10, 30 and 50 dimensions are solved. Further, the proposed algorithm has been tested by solving optimization problems with 100 dimensions taken from CEC2014 and CEC2017 benchmark problems. A real-world application data set has also been solved. Several experiments are designed to analyze the effects of different components of the proposed framework, with the best variant compared with a number of state-of-the-art algorithms. The experimental results show that the proposed algorithm is able to outperform all the others considered.</p
Patchy Amphiphilic Dendrimers Bind Adenovirus and Control Its Host Interactions and in Vivo Distribution
The surface of proteins is heterogeneous with sophisticated but precise hydrophobic and hydrophilic patches, which is essential for their diverse biological functions. To emulate such distinct surface patterns on macromolecules, we used rigid spherical synthetic dendrimers (polyphenylene dendrimers) to provide controlled amphiphilic surface patches with molecular precision. We identified an,. I optimal spatial arrangement of these patches on certain dendrimers that enabled their interaction with human adenovirus 5 (Ads). Patchy dendrimers bound to the surface of Ads formed a synthetic polymer corona that greatly altered various host interactions of Ads as well as in vivo distribution. The dendrimer corona (1) improved the ability of Ad5-derived gene transfer vectors to transduce cells deficient for the primary Ad5 cell membrane receptor and (2) modulated the binding of Ads to blood coagulation factor X, one of the most critical virus host interactions in the bloodstream. It significantly enhanced the transduction efficiency of Ad5 while also protecting it from neutralization by natural antibodies and the complement system in human whole blood. Ads with a synthetic dendrimer corona revealed profoundly altered in vivo distribution, improved transduction of heart, and dampened vector sequestration by liver and spleen. We propose the design of bioactive polymers that bind protein surfaces solely based on their amphiphilic surface patches and protect against a naturally occurring protein corona, which is highly attractive to improve Ad5-based in vivo gene therapy applications
Back reaction effects on the dynamics of heavy probes in heavy quark cloud
We holographically study the effect of back reaction on the hydrodynamical
properties of strongly coupled super Yang-Mills (SYM) thermal
plasma. The back reaction we consider arises from the presence of static heavy
quarks uniformly distributed over SYM plasma. In order to
study the hydrodynamical properties, we use heavy quark as well as heavy
quark-antiquark bound state as probes and compute the jet quenching parameter,
screening length and binding energy. We also consider the rotational dynamics
of heavy probe quark in the back-reacted plasma and analyse associated energy
loss. We observe that the presence of back reaction enhances the energy-loss in
the thermal plasma. Finally, we show that there is no effect of angular drag on
the rotational motion of quark-antiquark bound state probing the back reacted
thermal plasma.Comment: 29 pages, 21 figure
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