3,931 research outputs found
Complete NLO Operators in the Higgs Effective Field Theory
We enumerate the complete and independent sets of operators at the
next-to-leading order (NLO) in the Higgs effective field theory (HEFT), based
on the Young tensor technique on the Lorentz, gauge and flavor structures. The
operator-amplitude correspondence tells a type of operators forms the on-shell
amplitude basis, and for operators involving in Nambu-Goldstone bosons, the
amplitude basis is further reduced to the subspace satisfying the Adler's zero
condition in the soft momentum limit. Different from dynamical field, the
spurion should not enter into the Lorentz sector, instead it only plays a role
of forming the invariant together with other dynamical fields. With
these new treatments, for the first time we could obtain the 237 (8595)
operators for one (three) generation fermions, 295 (11307) with right-handed
neutrinos, and find there were 6 (9) terms of operators missing and many
redundant operators can be removed in the effective theory without (with)
right-handed neutrinos.Comment: 63 pages, 2 tables, revised version: operators in 4-component
notation, correct typo for countin
Terrace-like structure in the above-threshold ionization spectrum of an atom in an IR+XUV two-color laser field
Based on the frequency-domain theory, we investigate the above-threshold
ionization (ATI) process of an atom in a two-color laser field with infrared
(IR) and extreme ultraviolet (XUV) frequencies, where the photon energy of the
XUV laser is close to or larger than the atomic ionization threshold. By using
the channel analysis, we find that the two laser fields play different roles in
an ionization process, where the XUV laser determines the ionization
probability by the photon number that the atom absorbs from it, while the IR
laser accelerates the ionized electron and hence widens the electron kinetic
energy spectrum. As a result, the ATI spectrum presents a terrace-like
structure. By using the saddle-point approximation, we obtain a classical
formula which can predict the cutoff of each plateau in the terrace-like ATI
spectrum. Furthermore, we find that the difference of the heights between two
neighboring plateaus in the terrace-like structure of the ATI spectrum
increases as the frequency of the XUV laser increases
SAPI: Surroundings-Aware Vehicle Trajectory Prediction at Intersections
In this work we propose a deep learning model, i.e., SAPI, to predict vehicle
trajectories at intersections. SAPI uses an abstract way to represent and
encode surrounding environment by utilizing information from real-time map,
right-of-way, and surrounding traffic. The proposed model consists of two
convolutional network (CNN) and recurrent neural network (RNN)-based encoders
and one decoder. A refiner is proposed to conduct a look-back operation inside
the model, in order to make full use of raw history trajectory information. We
evaluate SAPI on a proprietary dataset collected in real-world intersections
through autonomous vehicles. It is demonstrated that SAPI shows promising
performance when predicting vehicle trajectories at intersection, and
outperforms benchmark methods. The average displacement error(ADE) and final
displacement error(FDE) for 6-second prediction are 1.84m and 4.32m
respectively. We also show that the proposed model can accurately predict
vehicle trajectories in different scenarios
Review on Electrical Installations and Lightning Protection Measures for High-rise Building
Lightning protection technology is widely used in electrical construction industry by protecting the buildings and its internal electrical infrastructure. Further researches on lightning protection technology are crucial due to the complexity of high-rise building internal electrical design and existence of some problem in current lightning protection technology. Lightning protection system will be more mature along with the development of technology, contributing to better prevention, ensures the safety of people’s lives and reduce the impact of economic loss caused by lightning. This article will focus on the analysis of electrical installations and lightning protection measures of high-rise building for future references
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