3,502 research outputs found
Longitudinal/Goldstone boson equivalence and phenomenology of probing the electroweak symmetry breaking
We formulate the equivalence between the longitudinal weak-boson and the
Goldstone boson as a criterion for sensitively probing the electroweak symmetry
breaking mechanism and develop a precise power counting rule for chiral
Lagrangian formulated electroweak theories. With these we semi-quatitatively
analyze the sensitivities to various effective operators related to
electrowaeak symmetry breaking via weak-boson scatterings at the CERN Large
Hadron Collider (LHC).Comment: 6 pages, LaTex, 1 postscript figure included using psfig.te
Sensitivity of the LHC to Electroweak Symmetry Breaking: Equivalence Theorem as a Criterion
Based upon our recent study on the intrinsic connection between the
longitudinal weak-boson scatterings and probing the electroweak symmetry
breaking (EWSB) mechanism, we reveal the profound physical content of the
Equivalence Theorem (ET) as being able to discriminate physical processes which
are sensitive/insensitive to probing the EWSB sector. With this physical
content of the ET as a criterion, we analyze the complete set of the bosonic
operators in the electroweak chiral Lagrangian and systematically classify the
sensitivities to probing all these operators at the CERN LHC via the weak-boson
fusion in channel. This is achieved by developing a precise power
counting rule (a generalization from Weinberg's counting method) to {\it
separately} count the power dependences on the energy and all relevant mass
scales.Comment: 33 pages, LaTeX, 10 figures and Table-1b are in the separate file
figtab.uu. (The only change made from the previous version is to fix the bugs
in the uuencoded file.
Spectral and optical properties in the antiphase stripe phase of the cuprate superconductors
We investigate the superconducting order parameter, the spectral and optical
properties in a stripe model with spin (charge) domain-derived scattering
potential (). We show that the charge domain-derived scattering
is less effective than the spin scattering on the suppression of
superconductivity. For , the spectral weight concentrates on
the () antinodal region, and a finite energy peak appears in the optical
conductivity with the disappearance of the Drude peak. But for , the spectral weight concentrates on the () nodal region,
and a residual Drude peak exists in the optical conductivity without the finite
energy peak. These results consistently account for the divergent observations
in the ARPES and optical conductivity experiments in several high-
cuprates, and suggest that the "insulating" and "metallic" properties are
intrinsic to the stripe state, depending on the relative strength of the spin
and charge domain-derived scattering potentials.Comment: 7 pages, 4 figure
Coexistence of the antiferromagnetic and superconducting order and its effect on spin dynamics in electron-doped high- cuprates
In the framework of the slave-boson approach to the model, it is
found that for electron-doped high- cuprates, the staggered
antiferromagnetic (AF) order coexists with superconducting (SC) order in a wide
doping level ranged from underdoped to nearly optimal doping at the mean-field
level. In the coexisting phase, it is revealed that the spin response is
commensurate in a substantial frequency range below a crossover frequency
for all dopings considered, and it switches to the incommensurate
structure when the frequency is higher than . This result is in
agreement with the experimental measurements. Comparison of the spin response
between the coexisting phase and the pure SC phase with a
-wave pairing plus a higher harmonics term (DP+HH) suggests
that the inclusion of the two-band effect is important to consistently account
for both the dispersion of the spin response and the non-monotonic gap behavior
in the electron-doped cuprates.Comment: 6 pages, 5 figure
Evaluating the Knowledge Management Capability of Organizations through a Fuzzy Linguistic Approach
Characterization of removable elements with respect to having k disjoint bases in a matroid
AbstractThe well-known spanning tree packing theorem of Nash-Williams and Tutte characterizes graphs with k edge-disjoint spanning trees. Edmonds generalizes this theorem to matroids with k disjoint bases. For any graph G that may not have k-edge-disjoint spanning trees, the problem of determining what edges should be added to G so that the resulting graph has k edge-disjoint spanning trees has been studied by Haas (2002) [11] and Liu et al. (2009) [17], among others. This paper aims to determine, for a matroid M that has k disjoint bases, the set Ek(M) of elements in M such that for any e∈Ek(M), M−e also has k disjoint bases. Using the matroid strength defined by Catlin et al. (1992) [4], we present a characterization of Ek(M) in terms of the strength of M. Consequently, this yields a characterization of edge sets Ek(G) in a graph G with at least k edge-disjoint spanning trees such that ∀e∈Ek(G), G−e also has k edge-disjoint spanning trees. Polynomial algorithms are also discussed for identifying the set Ek(M) in a matroid M, or the edge subset Ek(G) for a connected graph G
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