3,731 research outputs found
Anomalous gauge couplings of the Higgs boson at high energy photon colliders
We study the sensitivity of testing the anomalous gauge couplings 's
of the Higgs boson in the formulation of linearly realized gauge symmetry via
the processes and at polarized and
unpolarized photon colliders based on linear colliders of
c.m.~energies 500 GeV, 1 TeV, and 3 TeV. Signals beyond the standard model (SM)
and SM backgrounds are carefully studied. We propose certain kinematic cuts to
suppress the standard model backgrounds. For an integrated luminosity of 1
ab, we show that (a) can provide a test of
to the sensitivity of
TeV at a 500 GeV ILC, and TeV at a 1 TeV ILC and a 3
TeV CLIC, and (b) at a 3 TeV CLIC can test all the
anomalous couplings 's to the sensitivity of
TeV.Comment: 30 pages, 17 figure
QCD Multipole Expansion and Hadronic Transitions in Heavy Quarkonium Systems
We review the developments of QCD multipole expansion and its applications to
hadronic transitions and some radiative decays of heavy quarkonia. Theoretical
predictions are compsred with updated experimental results.Comment: 23 pages, 7 figures. Some typos corrected, and 3 references adde
Gaussian approximations for stochastic systems with delay: chemical Langevin equation and application to a Brusselator system
We present a heuristic derivation of Gaussian approximations for stochastic
chemical reaction systems with distributed delay. In particular we derive the
corresponding chemical Langevin equation. Due to the non-Markovian character of
the underlying dynamics these equations are integro-differential equations, and
the noise in the Gaussian approximation is coloured. Following on from the
chemical Langevin equation a further reduction leads to the linear-noise
approximation. We apply the formalism to a delay variant of the celebrated
Brusselator model, and show how it can be used to characterise noise-driven
quasi-cycles, as well as noise-triggered spiking. We find surprisingly
intricate dependence of the typical frequency of quasi-cycles on the delay
period.Comment: 14 pages, 9 figure
The magnetic dipole transitions in the binding system
The magnetic dipole transitions between the vector mesons and their
relevant pseudoscalar mesons (, , , ,
and etc, the binding states of system) of
the family are interesting. To see the `hyperfine' splitting due to
spin-spin interaction is an important topic for understanding the spin-spin
interaction and the spectrum of the the binding system. The
knowledge about the magnetic dipole transitions is also very useful for
identifying the vector boson mesons experimentally, whose masses are
just slightly above the masses of their relevant pseudoscalar mesons
accordingly. Considering the possibility to observe the vector mesons via the
transitions at factory and the potentially usages of the theoretical
estimate on the transitions, we fucus our efforts on calculating the magnetic
dipole transitions, i.e. precisely to calculate the rates for the transitions
such as decays and , and particularly
work in the Behte-Salpeter framework. In the estimate, as a typical example, we
carefully investigate the dependance of the rate
on the mass difference as well.Comment: 10 pages, 2 figures, 1 tabl
A novel method for deriving the aerosol hygroscopicity parameter based only on measurements from a humidified nephelometer system
Aerosol hygroscopicity is crucial for understanding roles
of aerosol particles in atmospheric chemistry and aerosol climate effects.
Light-scattering enhancement factor f(RH, λ) is one of the
parameters describing aerosol hygroscopicity, which is defined as
f(RH, λ) = σsp(RH, λ)∕σsp(dry, λ), where
σsp(RH, λ) or σsp(dry, λ) represents σsp at
wavelength λ under certain relative humidity (RH) or dry conditions.
Traditionally, an overall hygroscopicity parameter κ can be
retrieved from measured f(RH, λ), hereinafter referred to as
κf(RH), by combining concurrently measured particle number
size distribution (PNSD) and mass concentration of black carbon. In this
paper, a new method is proposed to directly derive κf(RH)
based only on measurements from a three-wavelength humidified nephelometer
system. The advantage of this newly proposed approach is that
κf(RH) can be estimated without any additional information
about PNSD and black carbon. This method is verified with measurements from
two different field campaigns. Values of κf(RH) estimated
from this new method agree very well with those retrieved by using the
traditional method: all points lie near the 1 : 1 line and the square of
correlation coefficient between them is 0.99. The verification results
demonstrate that this newly proposed method of deriving
κf(RH) is applicable at different sites and in seasons of
the North China Plain and might also be applicable in other regions around
the world
Decoherence in ion traps due to laser intensity and phase fluctuations
We consider one source of decoherence for a single trapped ion due to
intensity and phase fluctuations in the exciting laser pulses. For simplicity
we assume that the stochastic processes involved are white noise processes,
which enables us to give a simple master equation description of this source of
decoherence. This master equation is averaged over the noise, and is sufficient
to describe the results of experiments that probe the oscillations in the
electronic populations as energy is exchanged between the internal and
electronic motion. Our results are in good qualitative agreement with recent
experiments and predict that the decoherence rate will depend on vibrational
quantum number in different ways depending on which vibrational excitation
sideband is used.Comment: 2 figures, submitted to PR
k-Component q-deformed charge coherent states and their nonclassical properties
k-Component q-deformed charge coherent states are constructed, their
(over)completeness proved and their generation explored. The q-deformed charge
coherent states and the even (odd) q-deformed charge coherent states are the
two special cases of them as k becomes 1 and 2, respectively. A D-algebra
realization of the SU(1,1) generators is given in terms of them. Their
nonclassical properties are studied and it is shown that for , they
exhibit two-mode q-antibunching, but neither SU(1,1) squeezing, nor one- or
two-mode q-squeezing.Comment: LaTeX, 29 pages, 2 Postscript figures, minor change
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