24,577 research outputs found
Discretized normal approximation by Stein's method
We prove a general theorem to bound the total variation distance between the
distribution of an integer valued random variable of interest and an
appropriate discretized normal distribution. We apply the theorem to 2-runs in
a sequence of i.i.d. Bernoulli random variables, the number of vertices with a
given degree in the Erd\"{o}s-R\'{e}nyi random graph, and the uniform
multinomial occupancy model.Comment: Published in at http://dx.doi.org/10.3150/13-BEJ527 the Bernoulli
(http://isi.cbs.nl/bernoulli/) by the International Statistical
Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm
Study of the heavy CP-even Higgs with mass 125 GeV in two-Higgs-doublet models at the LHC and ILC
We assume that the 125 GeV Higgs discovered at the LHC is the heavy CP-even
Higgs of the two-Higgs-doublet models, and examine the parameter space in the
Type-I, Type-II, Lepton-specific and Flipped models allowed by the latest Higgs
signal data, the relevant experimental and theoretical constraints. Further, we
show the projected limits on , , and
couplings from the future measurements of the 125 GeV Higgs at the LHC
and ILC, including the LHC with integrated luminosity of 300 fb (LHC-300
fb) and 3000 fb (LHC-3000 fb) as well as the ILC at
GeV (ILC-250 GeV), GeV (ILC-500 GeV) and
GeV (ILC-1000 GeV). Assuming that the future Higgs signal data
have no deviation from the SM expectation, the LHC-300 fb, LHC-3000
fb and ILC-1000 GeV can exclude the wrong-sign Yukawa coupling regions
of the Type-II, Flipped and Lepton-specific models at the level,
respectively. The future experiments at the LHC and ILC will constrain the
Higgs couplings to be very close to SM values, especially for the
coupling.Comment: 22 pages, 3 tables, 6 figures. Version accepted for publication in
JHE
A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess
Due to the strong constrain from the LUX experiment, the scalar portal dark
matter can not generally explain a gamma-ray excess in the galactic center by
the annihilation of dark matter into . With the motivation of
eliminating the tension, we add a scalar dark matter to the aligned
two-Higgs-doublet model, and focus on a simplified scenario, which has two main
characteristics: (i) The heavy CP-even Higgs is the discovered 125 GeV Higgs
boson, which has the same couplings to the gauge bosons and fermions as the SM
Higgs. (ii) Only the light CP-even Higgs mediates the dark matter interactions
with SM particles, which has no couplings to and , but the independent
couplings to the up-type quarks, down-type quarks and charged leptons. We find
that the tension between and the constraint from
LUX induced by the scalar portal dark matter can go away for the
isospin-violating dark matter-nucleon coupling with , and
the constraints from the Higgs search experiments and the relic density of
Planck are also satisfied.Comment: 12 pages, 3 figures, 1 table; reference adde
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