6,268 research outputs found
Constraints on large-extra-dimensions model through 125 GeV Higgs pair production at the LHC
Based on the analysis of 5 fb^-1 of data at the LHC, the ATLAS and CMS
collaborations have presented evidence for a Higgs boson with a mass in the 125
GeV range. We consider the 125 GeV neutral Higgs pair production process in the
context of large-extra-dimensions (LED) model including the Kaluza-Klein
(KK)excited gravitons at the LHC. We consider the standard model(SM) Higgs pair
production in gluon-gluon fusion channel and pure LED effects through graviton
exchange as well as their interferences. It is shown that such interferences
should be included; the LED model raises the transverse momentum (Pt)and
invariant mass (M_HH) distributions at high scales of Pt and M_HH of the Higgs
pair production. By using the Higgs pair production we could set the discovery
limit on the cutoff scale M_S up to 6 TeV for delta = 2 and 4.5 TeV for delta =
6.Comment: 6 figure
Detection of treatment effects by covariate-adjusted expected shortfall
The statistical tests that are commonly used for detecting mean or median
treatment effects suffer from low power when the two distribution functions
differ only in the upper (or lower) tail, as in the assessment of the Total
Sharp Score (TSS) under different treatments for rheumatoid arthritis. In this
article, we propose a more powerful test that detects treatment effects through
the expected shortfalls. We show how the expected shortfall can be adjusted for
covariates, and demonstrate that the proposed test can achieve a substantial
sample size reduction over the conventional tests on the mean effects.Comment: Published in at http://dx.doi.org/10.1214/10-AOAS347 the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Topological Mid-gap States of Topological Insulators with Flux-Superlattice
In this paper based on the Haldane model, we study the topological insulator
with superlattice of pi-fluxes. We find that there exist the mid-gap states
induced by the flux-superlattice. In particular, the mid-gap states have
nontrivial topological properties, including the nonzero Chern number and the
gapless edge states. We derive an effective tight-binding model to describe the
topological midgap states and then study the mid-gap states by the effective
tight-binding model. The results can be straightforwardly generalized to other
two dimensional topological insulators with flux-superlattice.Comment: 6 pages, 9 figure
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