3,751 research outputs found
The semileptonic baryonic decay
The decay with a proton-antiproton pair in the
final state is unique in the sense that it is the only semileptonic baryonic
decay which is physically allowed in the charmed meson sector. Its measurement
will test our basic knowledge on semileptonic decays and the low-energy
interactions. Taking into account the major intermediate state
contributions from and , we find that its
branching fraction is at the level of . The location and
the nature of state are crucial for the precise determination of the
branching fraction. We wish to trigger a new round of a careful study with the
upcoming more data in BESIII as well as the future super tau-charm factory.Comment: final version, accepted for publication in Phys. Lett.
Branching fractions of semileptonic and decays from the covariant light-front quark model
Based on the predictions of the relevant form factors from the covariant
light-front quark model, we show the branching fractions for the ( or ) decays, where denotes
the pseudoscalar meson, the scalar meson with a mass above 1 GeV, the
vector meson and the axial-vector one. Comparison with the available
experimental results are made, and we find an excellent agreement. The
predictions for other decay modes can be tested in a charm factory, e.g., the
BESIII detector. The future measurements will definitely further enrich our
knowledge on the hadronic transition form factor as well as the inner structure
of the even-parity mesons ( and ).Comment: Predictions on D-> K1(1270), K1(1400) l nu rates correcte
Thermoelectric DC conductivities with momentum dissipation from higher derivative gravity
We present a mechanism of momentum relaxation in higher derivative gravity by
adding linear scalar fields to the Gauss-Bonnet theory. We analytically
computed all of the DC thermoelectric conductivities in this theory by adopting
the method given by Donos and Gauntlett in [arXiv:1406.4742]. The results show
that the DC electric conductivity is not a monotonic function of the effective
impurity parameter : in the small limit, the DC conductivity is
dominated by the coherent phase, while for larger , pair creation
contribution to the conductivity becomes dominant, signaling an incoherent
phase. In addition, the DC heat conductivity is found independent of the
Gauss-Bonnet coupling constant.Comment: 1+19 pages, 2 figures,typos in Eq.(40) correcte
Anisotropic plasma with a chemical potential and scheme-independent instabilities
Generically, the black brane solution with planar horizons is
thermodynamically stable. We find a counter-example to this statement by
demonstrating that an anisotropic black brane is unstable. We present a charged
black brane solution dual to a spatially anisotropic finite temperature
super Yang-Mills plasma at finite chemical potential.
This static and regular solution is obtained both numerically and analytically.
We uncover rich thermodynamic phase structures for this system by considering
the cases when the anisotropy constant "a" takes real and imaginary values,
respectively. In the case , the phase structure of this anisotropic
black brane is similar to that of Schwarzschild-AdS black hole with
horizon topology, yielding a thermodynamical instability at smaller horizon
radii. For the condition , the thermodynamics is dominated by the
black brane phase for all temperatures.Comment: 14pages,14figures, minor changes, PLB in pres
Random Sampling of Bandlimited Graph Signals from Local Measurements
The random sampling on graph signals is one of the fundamental topics in
graph signal processing. In this letter, we consider the random sampling of
k-bandlimited signals from the local measurements and show that no more than
O(klogk) measurements with replacement are sufficient for the accurate and
stable recovery of any k-bandlimited graph signals. We propose two random
sampling strategies based on the minimum measurements, i.e., the optimal
sampling and the estimated sampling. The geodesic distance between vertices is
introduced to design the sampling probability distribution. Numerical
experiments are included to show the effectiveness of the proposed methods
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