10,846 research outputs found
The Pseudoscalar Meson and Heavy Vector Meson Scattering Lengths
We have systematically studied the S-wave pseudoscalar meson and heavy vector
meson scattering lengths to the third order with the chiral perturbation
theory, which will be helpful to reveal their strong interaction. For
comparison, we have presented the numerical results of the scattering lengths
(1) in the framework of the heavy meson chiral perturbation theory and (2) in
the framework of the infrared regularization. The chiral expansion converges
well in some channels.Comment: 10 pages, 1 figures, 4 tables. Corrected typos, Improved numerical
results, and More dicussions. Accepted for publication by Phys.Rev.
Stationarity of SLE
A new method to study a stopped hull of SLE(kappa,rho) is presented. In this
approach, the law of the conformal map associated to the hull is invariant
under a SLE induced flow. The full trace of a chordal SLE(kappa) can be studied
using this approach. Some example calculations are presented.Comment: 14 pages with 1 figur
Correlated Quantum Memory: Manipulating Atomic Entanglement via Electromagnetically Induced Transparency
We propose a feasible scheme of quantum state storage and manipulation via
electromagnetically induced transparency (EIT) in flexibly
multi-ensembles of three-level atoms. For different atomic array
configurations, one can properly steer the signal and the control lights to
generate different forms of atomic entanglement within the framework of linear
optics. These results shed new light on designing the versatile quantum memory
devices by using, e.g., an atomic grid.Comment: 5 pages, 1 figur
Mass Hierarchy Determination Using Neutrinos from Multiple Reactors
We report the results of Monte Carlo simulations of a medium baseline reactor
neutrino experiment. The difference in baselines resulting from the 1 km
separations of Daya Bay and Ling Ao reactors reduces the amplitudes of 1-3
oscillations at low energies, decreasing the sensitivity to the neutrino mass
hierarchy. A perpendicular detector location eliminates this effect. We
simulate experiments under several mountains perpendicular to the Daya Bay/Ling
Ao reactors, considering in particular the background from the TaiShan and
YangJiang reactor complexes. In general the hierarchy can be determined most
reliably underneath the 1000 meter mountain BaiYunZhang, which is 44.5 km from
Daya Bay. If some planned reactors are not built then nearby 700 meter
mountains at 47-51 km baselines gain a small advantage. Neglecting their low
overhead burdens, hills near DongKeng would be the optimal locations. We use a
weighted Fourier transform to avoid a spurious dependence on the high energy
neutrino spectrum and find that a neural network can extract quantities which
determine the hierarchy marginally better than the traditional RL + PV.Comment: 22 pages, added details on the neural network (journal version
Tunable singlet-triplet splitting in a few-electron Si/SiGe quantum dot
We measure the excited-state spectrum of a Si/SiGe quantum dot as a function
of in-plane magnetic field, and we identify the spin of the lowest three
eigenstates in an effective two-electron regime. The singlet-triplet splitting
is an essential parameter describing spin qubits, and we extract this splitting
from the data. We find it to be tunable by lateral displacement of the dot,
which is realized by changing two gate voltages on opposite sides of the
device. We present calculations showing the data are consistent with a spectrum
in which the first excited state of the dot is a valley-orbit state.Comment: 4 pages with 3 figure
Above-threshold ionization photoelectron spectrum from quantum trajectory
Many nonlinear quantum phenomena of intense laser-atom physics can be
intuitively explained with the concept of trajectory. In this paper, Bohmian
mechanics (BM) is introduced to study a multiphoton process of atoms
interacting with the intense laser field: above-threshold ionization (ATI).
Quantum trajectory of an atomic electron in intense laser field is obtained
from the Bohm-Newton equation first and then the energy of the photoelectron is
gained from its trajectory. With energies of an ensemble of photoelectrons, we
obtain the ATI spectrum which is consistent with the previous theoretical and
experimental results. Comparing BM with the classical trajectory Monte-Carlo
method, we conclude that quantum potential may play a key role to reproduce the
spectrum of ATI. Our work may present a new approach to understanding quantum
phenomena in intense laser-atom physics with the image of trajectory.Comment: 10 pages, 3 figure
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