374 research outputs found

    IMB 1800 Programs for Data processing at the Accelerators of the Central Bureau for Nuclear Measurements. Part 3: Programs for Interactive Data Reduction. EUR 4404.

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    <p>A, miR393 and <i>DlCHS</i>; B, miR393 and <i>DlCHI</i>; C, miR393 and <i>DlFLS</i>; D, miR393 and <i>DlF3′H</i>; E, miR393 and <i>DlDFR</i>; F, miR393 and <i>DlLAR</i>; G, miR393 and its target gene <i>DlTIR1-3</i>.</p

    Precision Higgs physics at the CEPC

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    The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics. The Higgs boson will be the subject of extensive studies of the ongoing LHC program. At the same time, lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC, with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs boson. The Circular Electron Positron Collider~(CEPC) is one of such proposed Higgs factories. The CEPC is an e+e‚ąíe^+e^- circular collider proposed by and to be hosted in China. Located in a tunnel of approximately 100~km in circumference, it will operate at a center-of-mass energy of 240~GeV as the Higgs factory. In this paper, we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements.Comment: 46 pages, 37 figure

    Particle Transformer for Jet Tagging

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    Jet tagging is a critical yet challenging classification task in particle physics. While deep learning has transformed jet tagging and significantly improved performance, the lack of a large-scale public dataset impedes further enhancement. In this work, we present JetClass, a new comprehensive dataset for jet tagging. The JetClass dataset consists of 100 M jets, about two orders of magnitude larger than existing public datasets. A total of 10 types of jets are simulated, including several types unexplored for tagging so far. Based on the large dataset, we propose a new Transformer-based architecture for jet tagging, called Particle Transformer (ParT). By incorporating pairwise particle interactions in the attention mechanism, ParT achieves higher tagging performance than a plain Transformer and surpasses the previous state-of-the-art, ParticleNet, by a large margin. The pre-trained ParT models, once fine-tuned, also substantially enhance the performance on two widely adopted jet tagging benchmarks

    Loop-induced ZZZZ production at the LHC: An improved description by matrix-element matching

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    International audienceLoop-induced ZZ production can be enhanced by the large gluon flux at the LHC, and thus should be taken into account in relevant experimental analyses. We present for the first time the results of a fully exclusive simulation based on the matrix elements for loop-induced ZZ+0, 1, 2-parton processes at leading order, matched to parton showers. The new description is studied and validated by comparing it with well-established simulation with jets from parton showers. We find that the matched simulation provides a state-of-the-art description of the final-state jets. We also briefly discuss the physics impact on vector boson scattering measurements at the LHC, where event yields are found to be smaller by about 40% in a vector boson scattering ZZjj baseline search region, compared to previous simulations. We hence advocate relevant analyses to employ a more accurate jet description for the modeling of the loop-induced process

    Endoscopic Resection Compared with Gastrectomy to Treat Early Gastric Cancer: A Systematic Review and Meta-Analysis.

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    BACKGROUND:Endoscopic resection and gastrectomy are treatment modalities for early gastric cancer, but their relative benefits and risks are unclear. We conducted a systematic review and meta-analysis to compare endoscopic resection and gastrectomy for treating early gastric cancer. METHODS:We searched PubMed, Embase, and the Cochrane Library until April 2015 for studies comparing endoscopic resection with gastrectomy for treatment of early gastric cancer. Outcome measures were five-year overall survival (OS), length of hospital stay and postoperative morbidity. We calculated pooled hazard ratio (HR), weighted mean difference (WMD) and odds ratio (OR) using random effects models. RESULTS:Six studies comprising 1,466 patients (618 endoscopic resection and 848 gastrectomy) met inclusion criteria. Five-year OS was similar between endoscopic resection and gastrectomy (HR, 1.06; 95% CI: 0.61 to 1.83). Endoscopic resection was associated with shorter hospital stays (WMD, -6.94; 95% CI: -7.59 to -6.29) and reduced overall postoperative morbidity (OR, 0.36; 95% CI: 0.17 to 0.74). CONCLUSIONS:While five-year OS is similar between endoscopic resection and gastrectomy, endoscopic resection offers a shorter hospital stay and fewer complications than gastrectomy for treating early gastric cancer. Endoscopic resection is a reasonable treatment for early gastric cancer with a negligible risk of lymph node metastasis

    Catalytic ativities of single-atom catalysts for CO oxidation: Pti/FeOx vs. Fe-1/FeOx

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    An FeOx-based Pt single-atom catalyst (SAC), Pti/FeOx has stimulated significant recent interest owing to its extraordinary activity toward CO oxidation. The concept of SAC has also been successfully extended to other FeOx, supported transition metal systems both experimentally and theoretically. However, the FeOx substrate itself (denoted by Fei/FeOx following the same nomenclature of Pt-1/FeOx) as a typical transition metal oxide possesses a very low catalytic activity toward CO oxidation, although it can be viewed as Fe-1/FeOx SAC. Here, to understand the catalytic mechanism of FeOx-based SACs for CO oxidation, we have performed density functional theory calculations on Pt-1/FeOx and Fe-1/FeOx for CO oxidation to address the differences between these two SACs in terms of the catalytic mechanism of CO oxidation and the chemical behavior of the catalysts. Our calculation results indicated that the catalytic cycle of Fei/FeOx is much more difficult to accomplish than that of SAC Pt-1/FeO, because of a high activation barrier (1.09 eV) for regeneration of the oxygen vacancy formed when the second CO2 molecule desorbs from the surface. Moreover, density of states and Bader charge analysis revealed differences in the catalytic performance for CO oxidation by the SACs Fe-1/FeOx and Pt-1/FeOx,. This work provides insights into the fundamental interactions between the single-atom Pt-1 and FeOx substrate, and the exceptional catalytic performance of this system for CO oxidation. (C) 2017, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
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