547 research outputs found
NLO QCD + NLO EW corrections to productions with leptonic decays at the LHC
Precision tests of the Standard Model (SM) require not only accurate
experiments, but also precise and reliable theoretical predictions. Triple
vector boson production provides a unique opportunity to investigate the
quartic gauge couplings and check the validity of the gauge principle in the
SM. Since the tree-level predictions alone are inadequate to meet this demand,
the next-to-leading order (NLO) calculation becomes compulsory. In this paper,
we calculate the NLO QCD + NLO electroweak (EW) corrections to the
productions with subsequent leptonic decays at the LHC by
adopting an improved narrow width approximation which takes into account the
off-shell contributions and spin correlations from the - and -boson
leptonic decays. The NLO QCD+EW corrected integrated cross sections for the
productions and some kinematic distributions of final products are
provided. The results show that both the NLO QCD and NLO EW corrections are
significant. In the jet-veto event selection scheme with , the NLO QCD+EW relative corrections to the integrated cross section
are and , while the genuine NLO EW relative corrections are
and , for the and productions, respectively.
We also investigate the theoretical dependence of the integrated cross section
on the factorization/renormalization scale, and find that the scale uncertainty
is underestimated at the LO due to the fact that the strong coupling
is not involved in the LO matrix elements.Comment: 19 pages, 8 figure
Unified Data-Free Compression: Pruning and Quantization without Fine-Tuning
Structured pruning and quantization are promising approaches for reducing the
inference time and memory footprint of neural networks. However, most existing
methods require the original training dataset to fine-tune the model. This not
only brings heavy resource consumption but also is not possible for
applications with sensitive or proprietary data due to privacy and security
concerns. Therefore, a few data-free methods are proposed to address this
problem, but they perform data-free pruning and quantization separately, which
does not explore the complementarity of pruning and quantization. In this
paper, we propose a novel framework named Unified Data-Free Compression(UDFC),
which performs pruning and quantization simultaneously without any data and
fine-tuning process. Specifically, UDFC starts with the assumption that the
partial information of a damaged(e.g., pruned or quantized) channel can be
preserved by a linear combination of other channels, and then derives the
reconstruction form from the assumption to restore the information loss due to
compression. Finally, we formulate the reconstruction error between the
original network and its compressed network, and theoretically deduce the
closed-form solution. We evaluate the UDFC on the large-scale image
classification task and obtain significant improvements over various network
architectures and compression methods. For example, we achieve a 20.54%
accuracy improvement on ImageNet dataset compared to SOTA method with 30%
pruning ratio and 6-bit quantization on ResNet-34.Comment: ICCV202
Learning Global-aware Kernel for Image Harmonization
Image harmonization aims to solve the visual inconsistency problem in
composited images by adaptively adjusting the foreground pixels with the
background as references. Existing methods employ local color transformation or
region matching between foreground and background, which neglects powerful
proximity prior and independently distinguishes fore-/back-ground as a whole
part for harmonization. As a result, they still show a limited performance
across varied foreground objects and scenes. To address this issue, we propose
a novel Global-aware Kernel Network (GKNet) to harmonize local regions with
comprehensive consideration of long-distance background references.
Specifically, GKNet includes two parts, \ie, harmony kernel prediction and
harmony kernel modulation branches. The former includes a Long-distance
Reference Extractor (LRE) to obtain long-distance context and Kernel Prediction
Blocks (KPB) to predict multi-level harmony kernels by fusing global
information with local features. To achieve this goal, a novel Selective
Correlation Fusion (SCF) module is proposed to better select relevant
long-distance background references for local harmonization. The latter employs
the predicted kernels to harmonize foreground regions with both local and
global awareness. Abundant experiments demonstrate the superiority of our
method for image harmonization over state-of-the-art methods, \eg, achieving
39.53dB PSNR that surpasses the best counterpart by +0.78dB ;
decreasing fMSE/MSE by 11.5\%/6.7\% compared with the
SoTA method. Code will be available at
\href{https://github.com/XintianShen/GKNet}{here}.Comment: 10 pages, 10 figure
cyclo-TetraΒkis{ΞΌ-2,2β²-dimethyl-1,1β²-[2,2-bisΒ(bromoΒmethΒyl)propane-1,3-diΒyl]di(1H-benzimidazole)-ΞΊ2 N 3:N 3β²}tetraΒkisΒ[bromidocopper(I)]
The title compound, [Cu4Br4(C21H22Br2N4)4], features a macrocyclic Cu4
L
4 ring system in which each CuI atom is coordinated by one bromide ion and two N atoms from two 2,2β²-dimethyl-1,1β²-[2,2-bisΒ(bromoΒmethΒyl)propane-1,3-diΒyl]di(1H-benzimidazole) (L) ligands in a distorted trigonalβplanar geometry. The L ligands adopt either a cis or trans configuration. The asymmetric unit contains one half-molΒecule with the center of the macrocycle located on a crystallographic center of inversion. Each bromide ion binds to a CuI atom in a terminal mode and is oriented outside the ring. The macrocycles are interΒconnected into a two-dimensional network by ΟβΟ interΒactions between benzimidΒazole groups from different rings [centroidβcentroid distance = 3.803β
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