2,406 research outputs found
LHC Signatures of Two-Higgs-Doublets with Fourth Family
On-going Higgs searches in the light mass window are of vital importance for
testing the Higgs mechanism and probing new physics beyond the standard model
(SM). The latest ATLAS and CMS searches for the SM Higgs boson at the LHC
(7TeV) found some intriguing excesses of events in the \gamma\gamma/VV^*
channels (V=Z,W) around the mass-range of 124-126 GeV. We explore a possible
explanation of the \gamma\gamma and VV^* signals from the light CP-odd Higgs
A^0 or CP-even Higgs h^0 from the general two-Higgs-doublet model with
fourth-family fermions. We demonstrate that by including invisible decays of
the Higgs boson A^0 or h^0 to fourth-family neutrinos, the predicted
\gamma\gamma and VV^* signals can explain the observed new signatures at the
LHC, and will be further probed by the forthcoming LHC runs in 2012.Comment: 22pp, 10 Figs, JHEP published version, references adde
The truncated Hamburger matrix moment problems in the nondegenerate and degenerate cases, and matrix continued fractions
AbstractThe present paper deals simultaneously with the nondegenerate and degenerate truncated Hamburger matrix moment problems in a unified way based on the use of the Schur algorithm involving matrix continued fractions. A full analysis of them together with a relative matrix moment problem on the real axis is given. With the help of the correspondence between the moment problem on the real axis and the Nevanlinna-Pick (NP) interpolation, the solutions of the nontangential NP interpolation in the Nevanlinna class are derived as an application
Experimental Realization of Entanglement Concentration and A Quantum Repeater
We report an experimental realization of entanglement concentration using two
polarization-entangled photon pairs produced by pulsed parametric
down-conversion. In the meantime, our setup also provides a proof-in-principle
demonstration of a quantum repeater. The quality of our procedure is verified
by observing a violation of Bell's inequality by more than 5 standard
deviations. The high experimental accuracy achieved in the experiment implies
that the requirement of tolerable error rate in multi-stage realization of
quantum repeaters can be fulfilled, hence providing a practical toolbox for
quantum communication over large distances.Comment: 15 pages, 4 figures, submitte
One-Shot Parameter Identification of the Thevenin's Model for Batteries: Methods and Validation
Parameter estimation is of foundational importance for various model-based
battery management tasks, including charging control, state-of-charge
estimation and aging assessment. However, it remains a challenging issue as the
existing methods generally depend on cumbersome and time-consuming procedures
to extract battery parameters from data. Departing from the literature, this
paper sets the unique aim of identifying all the parameters offline in a
one-shot procedure, including the resistance and capacitance parameters and the
parameters in the parameterized function mapping from the state-of-charge to
the open-circuit voltage. Considering the well-known Thevenin's battery model,
the study begins with the parameter identifiability analysis, showing that all
the parameters are locally identifiable. Then, it formulates the parameter
identification problem in a prediction-error-minimization framework. As the
non-convexity intrinsic to the problem may lead to physically meaningless
estimates, two methods are developed to overcome this issue. The first one is
to constrain the parameter search within a reasonable space by setting
parameter bounds, and the other adopts regularization of the cost function
using prior parameter guess. The proposed identifiability analysis and
identification methods are extensively validated through simulations and
experiments
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