40,459 research outputs found
Z-pole test of effective dark matter diboson interactions at the CEPC
In this paper we investigate the projected sensitivity to effective dark
matter (DM) - diboson interaction during the high luminosity -pole and 240
GeV runs at the proposed Circular Electron Positron Collider (CEPC). The
proposed runs at the 91.2 GeV center of mass energy offers an
interesting opportunity to probe effective dark matter couplings to the
boson, which can be less stringently tested in non-collider searches. We
investigate the prospective sensitivity for dimension 6 and dimension 7
effective diboson operators to scalar and fermion dark matter. These diboson
operators can generate semi-visible boson decay, and high missing
transverse momentum mono-photon signals that can be test efficiently at the
CEPC, with a small and controllable Standard Model
background. A projected sensitivity for effective coupling efficient
GeV, GeV for scalar DM,
GeV, GeV for fermion DM are
obtain for 25 fb and 2.5 ab -pole luminosities assuming the
optimal low dark matter mass range. In comparison the effective DM-diphoton
coupling sensitivity GeV for scalar DM,
GeV for fermion DM are also obtained for
a 5 ab 240 GeV Higgs run. We also compare the CEPC sensitivities to
current direct and indirect search limits on these effective DM-diboson
operators.Comment: 10 pages, 7 figures. Dimension-6 diboson operators include
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Impacts of model calibration on high-latitude land-surface processes: PILPS 2(e) calibration/validation experiments
In the PILPS 2(e) experiment, the Snow Atmosphere Soil Transfer (SAST) land-surface scheme developed from the Biosphere-Atmosphere Transfer Scheme (BATS) showed difficulty in accurately simulating the patterns and quantities of runoff resulting from heavy snowmelt in the high-latitude Torne-Kalix River basin (shared by Sweden and Finland). This difficulty exposes the model deficiency in runoff formations. After representing subsurface runoff and calibrating the parameters, the accuracy of hydrograph prediction improved substantially. However, even with the accurate precipitation and runoff, the predicted soil moisture and its variation were highly "model-dependent". Knowledge obtained from the experiment is discussed. Β© 2003 Elsevier Science B.V. All rights reserved
Multiplicity Preserving Triangular Set Decomposition of Two Polynomials
In this paper, a multiplicity preserving triangular set decomposition
algorithm is proposed for a system of two polynomials. The algorithm decomposes
the variety defined by the polynomial system into unmixed components
represented by triangular sets, which may have negative multiplicities. In the
bivariate case, we give a complete algorithm to decompose the system into
multiplicity preserving triangular sets with positive multiplicities. We also
analyze the complexity of the algorithm in the bivariate case. We implement our
algorithm and show the effectiveness of the method with extensive experiments.Comment: 18 page
2.5D multi-view gait recognition based on point cloud registration
This paper presents a method for modeling a 2.5-dimensional (2.5D) human body and extracting the gait features for identifying the human subject. To achieve view-invariant gait recognition, a multi-view synthesizing method based on point cloud registration (MVSM) to generate multi-view training galleries is proposed. The concept of a density and curvature-based Color Gait Curvature Image is introduced to map 2.5D data onto a 2D space to enable data dimension reduction by discrete cosine transform and 2D principle component analysis. Gait recognition is achieved via a 2.5D view-invariant gait recognition method based on point cloud registration. Experimental results on the in-house database captured by a Microsoft Kinect camera show a significant performance gain when using MVSM
Root Isolation of Zero-dimensional Polynomial Systems with Linear Univariate Representation
In this paper, a linear univariate representation for the roots of a
zero-dimensional polynomial equation system is presented, where the roots of
the equation system are represented as linear combinations of roots of several
univariate polynomial equations. The main advantage of this representation is
that the precision of the roots can be easily controlled. In fact, based on the
linear univariate representation, we can give the exact precisions needed for
roots of the univariate equations in order to obtain the roots of the equation
system to a given precision. As a consequence, a root isolation algorithm for a
zero-dimensional polynomial equation system can be easily derived from its
linear univariate representation.Comment: 19 pages,2 figures; MM-Preprint of KLMM, Vol. 29, 92-111, Aug. 201
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