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国家自然科学基金(11121092)

作品数:14 被引量:6H指数:2
相关作者:张刚邓子艳孙涌李卫东张晓梅更多>>
相关机构:中国科学院苏州大学中国科学技术大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划中国博士后科学基金更多>>
相关领域:理学天文地球核科学技术自动化与计算机技术更多>>

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14 条 记 录,以下是 1-10
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Testing the electroweak phase transition in scalar extension models at lepton colliders
2018年
We study the electroweak phase transition in three scalar extension models beyond the Standard Model.Assuming new scalars are decoupled at some heavy scale, we use the covariant derivative expansion method to derive all of the dimension-6 effective operators, whose coefficients are highly correlated in a specific model. We provide bounds to the complete set of dimension-6 operators by including the electroweak precision test and recent Higgs measurements. We find that the parameter space of strong first-order phase transitions(induced by the |H|~6 operator)can be probed extensively in Zh production at future electron-positron colliders.
曹庆宏黄发朋谢柯盼张新民
关键词:HIGGS
Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT
2018年
Recently, many new dwarf spheroidal satellites(dSphs) have been discovered by the Dark Energy Survey(DES). These dSphs are ideal candidates for probing for gamma-ray emissions from dark matter(DM) annihilation.However, no significant signature has been found by the Fermi-LAT dSph observations. In this work, we reanalyze the Fermi-LAT Pass 8 data from the direction of Reticulum II, where a slight excess has been reported by some previous studies. We treat Reticulum II(DES J0335.6-5403) as a spatially extended source, and find that no significant gamma-ray signature is observed. Based on this result, we set upper-limits on the DM annihilation cross section.
赵熠毕效军殷鹏飞张新民
An extended segment pattern dictionary for a pattern matching tracking algorithm at BES Ⅲ
2013年
A pattern matching based tracking algorithm, named MdcPatRec, is used for the reconstruction of charged tracks in the drift chamber of the BESIII detector. This paper addresses the shortage of segment finding in the MdcPatRec algorithm. An extended segment construction scheme and the corresponding pattern dictionary are presented. Evaluation with Monte-Carlo and experimental data show that the new method can achieve higher efficiency for low transverse momentum tracks.
马长利张瑶袁野吕晓睿郑阳恒何康林李卫东刘怀民马秋梅伍灵慧
Probing the origin of our universe through primordial gravitational waves by Ali CMB project
2016年
Gravitational waves (GW), which were predicted by Einstein in 1916 based on the classical theory of General Relativ- ity (GR), were recently detected by LIGO [1]. This break- through is expected to initiate a novel probe of cosmology, the nature of gravity as well as fundamental physics. In general, signals of GWs can be classified into two categories, which are waves from astro-physical and cosmological sources re- spectively. Accordingly, a number of astronomical and cos- mological experiments are under design across the world [2]. In particular, China is playing a very important role in this field by strengthening a series of fundamental scientific sub- iects, such as cosmic evolution, structure of matter,
Yi-Fu CaiXinMin Zhang
关键词:宇宙起源招商项目宇宙探测
What can we learn from the tension between PLANCK and BICEP2 data?被引量:2
2014年
Recently BICEP2 collaboration has announced the detection of the primordial gravitational waves at high confidence level. In light of the results of B-modes power spectrum from BICEP2 and using the based ACDM, a constraint on the tensor-to-scalar ratio r = 0.20-0.05+0.07 (68% C.L.) can be obtained, however, this result is in apparent tension with the limit on standard inflation models from the recent PLANCK measurement, r 〈 0.11 (95% C.L.). Herein we review the recent progress on the cosmological studies after BICEP2 and discuss on different ways of reconciling the tension between PLANCK and BICEP2 data. We will discuss possible modifications on the standard cosmological model, such as including the running of scalar spectral index or other cosmological parameters correlated with inflationary cosmological parameters, or tilting the primordial power spectrum at large scales by introducing a cut off which can be predicted by bouncing cosmology. We will also comment on another possibility of generating extra B-modes of CMB polarization, namely by a non-zero polarization rotation angle during its transferring from the last scattering surface.
LI HongLI MingZheQIU TaoTaoXIA JunQingPIAO YunSongZHANG XinMin
Evidence for e^+e^-→γχ_(c1,2) at center-of-mass energies from 4.009 to 4.360 GeV
2015年
Using data samples collected at center-of-mass energies of √s=4.009, 4.230, 4.260, and 4.360 GeV with the BES0 detector operating at the BEPC/ collider, we perform a search for the process e+e-→γχc,j (J =0, 1, 2) and find evidence for e+e-→γχc1 and e+e-→γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e-→γχc,j), as well as their upper limits at the 90% con dence level (C.L.) are determined at each center-of-mass energy.
麦迪娜M.N.Achasov艾小聪O.AlbayrakM.AlbrechtD.J.AmbroseA.Amoroso安芬芬安琪白景芝R.Baldini Ferroli班勇D.W.BennettJ.V.BennettM.BertaniD.Bettoni边渐鸣F.BianchiE.BogerO.BondarenkoI.BoykoR.A.Briere蔡浩蔡啸O.CakirA.Calcaterra曹国富S.A.Cetin常劲帆G.Chelkov陈刚陈和生陈海云陈江川陈玛丽陈申见谌炫陈旭荣陈元柏程和平褚新坤G.CibinettoD.Cronin-Hennessy代洪亮代建平A.DbeyssiD.Dedovich邓子艳A.DenigI.DenysenkoM.DestefaniF.De Mori丁勇董超董静董燎原董明义杜书先段鹏飞范荆州方建房双世方馨方易L.FavaF.FeldbauerG.Felici封常青E.FioravantiM.Fritsch傅成栋高清高原宁高榛I.GarziaK.Goetzen龚文煊W.GradlM.Greco顾旻皓顾运厅管颖慧郭爱强郭立波郭墩郭玥Y.P.GuoZ.HaddadiA.Hafner韩爽韩艳良F.A.Harris何康林何振亚T.Held衡月昆侯治龙胡琛胡海明胡继峰胡涛胡誉黄光明黄光顺黄海鹏黄金书黄性涛黄勇T.Hussain纪全姬清平季晓斌季筱璐姜丽丽姜鲁文江晓山焦健斌焦铮金大鹏金山T.JohanssonA.JulinN.Kalantar-Nayestanaki康晓琳康晓珅M.KavatsyukB.C.KeR.KliemtB.KlossO.B.KolcuB.KopfM.KornicerW.KuehnA.Kupsc赖蔚J.S.LangeM.LaraP.Larin李春花李澄李德民李飞李刚李海波李家才李瑾李康李科李培荣李腾李卫东李卫国李晓玲李小梅李小�
A possible interpretation of the Higgs mass by the cosmological attractive relaxion
2016年
Recently, a novel idea [1] has been proposed to relax the electroweak hierarchy problem through the cosmological inflation and the axion periotic potential. Here, we further assume that only the attractive inflation is needed to explain the light mass of the Higgs boson, where we do not need a specified periodic potential of the axion field. Attractive inflation during the early universe drives the Higgs boson mass from the large value in the early universe to the small value at present, where the Higgs mass is an evolving parameter of the Universe. Thus, the small Higgs mass can technically originate from the cosmological evolution rather than dynamical symmetry or anthropics. Further, we study the possible collider signals or constraints at a future lepton collier and the possible constraints from the muon anomalous magnetic moment. A concrete attractive relaxion model is also discussed, which is consistent with the data of Planck 2015.
黄发朋蔡一夫李虹张新民
关键词:HIGGSINFLATION
宇宙正反物质不对称的起源被引量:1
2016年
宇宙中正反物质不对称性的起源是粒子物理和宇宙学中极具挑战性的问题,至今人们还不清楚该问题的本质.随着实验观测的日益精确,人们对这一未解之谜的研究日益深入.本文首先简要介绍宇宙正反物质不对称性之谜的背景,以及在理论上解释该问题所要满足的基本条件.然后结合最新的理论和实验进展,重点介绍了3种能自洽地解释正反物质不对称性并且能够在实验上进行验证的理论,包括电弱重子数产生机制、轻子数不对称产生机制以及引力重子数产生机制.期望未来更精确的实验能够验证究竟哪种机制才是宇宙正反物质不对称性的起源.
黄发朋李明哲顾佩洪张新民
Zc(3900)与粲介子的耦合的寻找
2017年
继发现带电类粲偶素结构Zc(3900)之后,北京谱仪(BES Ⅲ)又发现了一系列带电的和中性的Zc粒子.为了理解这些Zc粒子的内部结构和性质,BESⅢ实验利用其在质心系能量4.23和4.26 GeV处采集的数据样本对e^+e^-→π~±(DDˉ*)?和e+e-→π~0(DD~*)~0过程进行了研究.在DD~*系统中分别观测到1个带电的类粲偶素结构Zc(3885)~?和1个中性的类粲偶素结构Zc(3885)0,且他们的极点质量和宽度在1σ范围内一致,因此Z_c(3885)极有可能是1个类粲偶素同位旋3重态.BESⅢ实验还测量了π±Z_c(3885)~?系统的角分布,结果显示其带电Zc(3885)?的自旋宇称量子数JP符合1+的预期.
王斌董燎原喻纯旭
关键词:粲偶素
Track segment finding with CGEM-IT and matching to outer drift chamber tracks in the BESIII detector
2016年
The relative differences in coordinates of Cylindrical Gas Electron Multiplier Detector-based Inner Tracker(CGEM-IT) clusters are studied to search for track segments in CGEM-IT for the BESIII experiment.With the full simulation of single muon track samples, clear patterns are found and parameterized for the correct cluster combinations. The cluster combinations satisfying the patterns are selected as track segment candidates in CGEM-IT with an efficiency higher than 99%. The parameters of the track segments are obtained by a helix fitting.Some χ^2 quantities, evaluating the differences in track parameters between the track segments in CGEM-IT and the tracks found in the outer drift chamber, are calculated and used to match them. Proper χ^2 requirements are determined as a function of transverse momentum and the matching efficiency is found to be reasonable.
孙新华王亮亮伍灵慧鞠旭东修青磊董燎原董明义李卫东李卫国刘怀民欧阳群袁野张瑶
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