分类： 物理学 >> 基本粒子与场物理学 提交时间： 2016-05-09
摘要： We propose a deflected anomaly mediation scenario from SUSY QCD which can lead to both positive and negative deflection parameters (there is a smooth transition between these two deflection parameter regions by adjusting certain couplings). Such a scenario can naturally give a SUSY spectrum in which all the colored sparticles are heavy while the sleptons are light. As a result, the discrepancy between the Brookheaven g(mu) - 2 experiment and LHC data can be reconciled in this scenario. We also find that the parameter space for explaining the g(mu) - 2 anomaly at 1 sigma level can be fully covered by the future LUX-ZEPLIN 7.2 Ton experiment.
分类： 物理学 >> 基本粒子与场物理学 提交时间： 2016-05-14
摘要： We consider the natural supersymmetry scenario in the framework of the R-parity conserving minimal supersymmetric standard model (called natural MSSM) and examine the observability of stop pair production at the LHC. We first scan the parameters of this scenario under various experimental constraints, including the SM-like Higgs boson mass, the indirect limits from precision electroweak data and B-decays. Then in the allowed parameter space we study the stop pair production at the LHC followed by the stop decay into a top quark plus a lightest neutralino or into a bottom quark plus a chargino. From detailed Monte Carlo simulations of the signals and backgrounds, we find the two decay modes are complementary to each other in probing the stop pair production, and the LHC with root s = 14 TeV and 100 fb(-1) luminosity is capable of discovering the stop predicted in natural MSSM up to 450 GeV. If no excess events were observed at the LHC, the 95% C.L. exclusion limits of the stop masses can reach around 537 GeV.
分类： 物理学 >> 基本粒子与场物理学 提交时间： 2016-05-09
摘要： The excess of top-quark forward-backward asymmetry (A(FB)(t)) reported by the Tevatron and the enhancement of the Higgs decay to diphoton observed at the LHC may point to a same origin of new physics. In this note we examined such anomalies in the two-Higgs-doublet model with a color-triplet scalar. We found that under current experimental constraints this model can simultaneously explain both anomalies at 1 sigma level. Also, we examined the Higgs decay h -> Z gamma and displayed its correlation with h -> gamma gamma. We found that unlike other models, this model predicts a special correlation between h -> Z gamma and h -> gamma gamma, i.e., the Z gamma rate is highly suppressed while the gamma gamma rate is enhanced. This behavior may help to distinguish this model in the future high luminosity run of the LHC.
分类： 化学 >> 物理化学 提交时间： 2017-11-05 合作期刊: 《结构化学》
摘要： Nanosized Ce1-x(Nd0.5Eu0.5)xO2-d solid solutions (x = 0.00～0.20) were synthesized by means of hydrothermal method. Then the solid solutions were ball milled with Mg2Ni and Ni powders for 20 h to get the Mg2Ni–Ni–5 mol% Ce1-x(Nd0.5Eu0.5)xO2-d composites. The structures and spectrum characteristics of the Ce1-x(Nd0.5Eu0.5)xO2-d solid solutions catalysts were analyzed systemically. XRD results showed that the doped samples exhibited single phase of CeO2 fluorite structure. The cell parameters and cell volumes were increased with increasing the doped content. Raman spectrum revealed that the peak position of F2g mode shift to higher wavenumbers and the peak corresponding to oxygen vacancies were observed distinctly for the doped samples. UV-Vis technique indicated that the absorption peaks of Eu3+ and Nd3+ ions appeared; the bandgap energy was decreased linearly. The electrochemical and kinetic properties of the Mg2Ni–Ni–5 mol% Ce1-x(Nd0.5Eu0.5)xO2-d composites were measured. The maximum discharge capacity was increased from 722.3 mAh/g for x = 0.00 to 819.7 mAh/g for x = 0.16, and the cycle stability S20 increased from 25.0% (x = 0.00) to 42.2% (x = 0.20). The kinetic measurement proved that the catalytic activity of composite surfaces and the hydrogen diffusion rate were improved for the composites with doped catalysts, especially for the composites with x = 0.16 and x = 0.20. The catalysis mechanism was analyzed from the point of microstructure and spectrum features of the Ce1-x(Nd0.5Eu0.5)xO2-d solid solutions.
分类： 生物学 >> 生物物理学 提交时间： 2016-05-12
Yuan, Shanshan
Zhang, Yang
Liu, Yalei
Yu, Nan
Zhang, Hong
Lu, Guizhi
Gao, Yanming
Gao, Ying
Guo, Xiaohui
Li, Qianqian
Huang, Chuncui
Wu, Hongmei
Li, Yan
摘要： Objective: Sera of Hashimoto's thyroiditis (HT) patients are known to exhibit elevated levels of anti-thyroglobulin IgG (TgAb IgG). Therefore, TgAb IgG represents a hallmark of this debilitating autoimmune disease. The aim of our study was to investigate the differential expression of specific glycosylation patterns of TgAb IgG from HT patients and healthy blood donors. Methods: HT patients (n = 32) were divided into two subgroups, medium level group (mHT, n = 15) and high level group (hHT, n = 17), according to the serum levels of TgAb detected by electrochemiluminescence immunoassay. TgAb IgG was purified by affinity chromatography from the sera of the HT group and control group (n = 15). MALDI-QIT-TOF-MS/MS spectrometry was performed to identify the glycosylation profiles of purified TgAb IgG. Lectin microarray technology was used to compare the abundance of different glycans found on TgAb IgG between HT patients and controls, and between the mHT and hHT groups. Results: The results by MALDI-QIT-TOF-MS/MS showed that the glycosylation profiles of TgAb IgG were similar between the mHT, hHT, and control groups. Furthermore, the lectin microarray showed that compared to the control group (all P < .001), there were higher levels present of (1) mannose (detected as lectin LCA, VFA, and MNA-M); (2) terminal sialic acid (detected as SNA-I and PSA); (3) core fucose (detected as LcH); and (4) Gal(beta 1-4) GlcNAc(beta 1-2) Man glycans (detected as PHA-L) on TgAb IgG from the HT group. A similar trend was observed between the hHT and mHT group, with elevated levels of mannose, terminal sialic acid, core fucose, and Gal(beta 1-4) GlcNAc(< 12) Man glycans on TgAb IgG found in the hHT group compared with the mHT group (all P < .05). Conclusions: TgAb IgG of HT patients exhibits higher glycosylation levels than those observed for TgAb IgG of healthy controls. Our results provide new clues for exploring the role of TgAb in the pathogenesis of HT.
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