60,766 research outputs found
Left-Right Asymmetry of Weak Interaction Mass of Polarized Fermions in Flight
The left-right polarization-dependent asymmetry of the weak interaction mass
is investigated. Based on the Standard Model, the calculation shows that the
weak interaction mass of left-handed polarized fermions is always greater than
that of right-handed polarized fermions in flight with the same velocity in any
inertial frame. The asymmetry of the weak interaction mass might be very
important to the investigation of neutrino mass and would have an important
significance for understanding the parity nonconservation in weak interactions.Comment: 8 pages, 2 figures, corrected calculatio
Dynamic and spectral properties of transmission eigenchannels in random media
The eigenvalues of the transmission matrix provide the basis for a full
description of the statistics of steady-state transmission and conductance. At
the same time, the ability to excite the sample with the waveform of specific
transmission eigenchannels allows for control over transmission. However, the
nature of pulsed transmission of transmission eigenchannels and their spectral
correlation, which would permit control of propagation in the time domain, has
not been discussed. Here we report the dramatic variation of the dynamic
properties of transmission with incident waveform. Computer simulations show
that lower-transmission eigenchannels respond more promptly to an incident
pulse and are correlated over a wide frequency range. We explain these results
together with the puzzlingly large dynamic range of transmission eigenvalues in
terms of the way quasi-normal modes of the medium combine to form specific
transmission eigenchannels. Key factors are the closeness of the illuminating
waves to resonance with the modes comprising an eigenchannel, their spectral
range, and the interference between the modes. We demonstrate in microwave
experiments that the modal characteristics of eigenchannels provide the optimum
way efficiently excite specific modes of the medium.Comment: This paper is an expansion of a previous paper
http://arxiv.org/abs/1406.3673 and treats many new issues including pulsed
transmission of transmission eigenchannels, correlation between modes and
transmission eigenchannels, and the efficient and selective excitation of
modes. The previous article is no longer under activ
Experimental tests on the lifetime Asymmetry
The experimental test problem of the left-right polarization-dependent
lifetime asymmetry is discussed. It shows that the existing experiments cannot
demonstrate the lifetime asymmetry to be right or wrong after analyzing the
measurements on the neutron, the muon and the tau lifetime, as well as the
experiment. However, It is pointed out emphatically that the SLD and the
E158 experiments, the measurements of the left-right integrated cross section
asymmetry in boson production by collisions and by
electron-electron M{\o}ller scattering, can indirectly demonstrate the lifetime
asymmetry. In order to directly demonstrate the lifetime asymmetry, we propose
some possible experiments on the decays of polarized muons. The precise
measurement of the lifetime asymmetry could have important significance for
building a muon collider, also in cosmology and astrophysics. It would provide
a sensitive test of the standard model in particle physics and allow for
exploration of the possible interactions.Comment: 11 pages, 1 figur
Leveraging Contextual Cues for Generating Basketball Highlights
The massive growth of sports videos has resulted in a need for automatic
generation of sports highlights that are comparable in quality to the
hand-edited highlights produced by broadcasters such as ESPN. Unlike previous
works that mostly use audio-visual cues derived from the video, we propose an
approach that additionally leverages contextual cues derived from the
environment that the game is being played in. The contextual cues provide
information about the excitement levels in the game, which can be ranked and
selected to automatically produce high-quality basketball highlights. We
introduce a new dataset of 25 NCAA games along with their play-by-play stats
and the ground-truth excitement data for each basket. We explore the
informativeness of five different cues derived from the video and from the
environment through user studies. Our experiments show that for our study
participants, the highlights produced by our system are comparable to the ones
produced by ESPN for the same games.Comment: Proceedings of ACM Multimedia 201
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