您的位置: 专家智库 > >

国家自然科学基金(10225524)

作品数:8 被引量:26H指数:1
相关作者:王贻芳张峰陈明君张达华马海龙更多>>
相关机构:中国科学院中国高等科学技术中心更多>>
发文基金:国家自然科学基金中国科学院“百人计划”中国科学院知识创新工程更多>>
相关领域:理学核科学技术更多>>

文献类型

  • 8篇中文期刊文章

领域

  • 7篇理学
  • 1篇核科学技术

主题

  • 3篇J/Ψ
  • 2篇BES
  • 2篇EXPERI...
  • 1篇英文
  • 1篇优化设计
  • 1篇振荡
  • 1篇扫描数据
  • 1篇探测器
  • 1篇中微子
  • 1篇蒙特卡罗模拟
  • 1篇反物质
  • 1篇Ψ(2S)
  • 1篇REACTO...
  • 1篇RECENT
  • 1篇RESONA...
  • 1篇RESULT...
  • 1篇ALPHA
  • 1篇BE
  • 1篇CHARMO...
  • 1篇DECAY

机构

  • 3篇中国科学院
  • 1篇中国高等科学...

作者

  • 2篇王贻芳
  • 1篇荣刚
  • 1篇陈江川
  • 1篇赵明刚
  • 1篇陈明君
  • 1篇马海龙
  • 1篇张达华
  • 1篇张峰

传媒

  • 4篇Chines...
  • 1篇高能物理与核...
  • 1篇物理
  • 1篇核电子学与探...
  • 1篇Chines...

年份

  • 1篇2013
  • 1篇2012
  • 1篇2010
  • 1篇2009
  • 1篇2008
  • 2篇2007
  • 1篇2003
8 条 记 录,以下是 1-8
排序方式:
Charmonium results from BES
2010年
Using ~ 14 × 10^6 ψ(2S) and ~ 58 × 10^ J/ ψ data collected at BES Ⅱ/BEPC, the branching fraction of ψ(2S)→Ω-Ω^+ is measured with about 5a statistical significance. The A electric dipole and ∧ decay parameter are studied using the decay J/ψ →∧∧→ ppπ^+π^-. Using (106±3)× 10^6 ψ(2S) decays collected at BESⅢ/BEPC Ⅱ, we have obtained some interesting physics results. The branching fractions of XcJ→π^0π^0, ηη are measured with precision improved. The mass and width of he(l^1P1) state, together with the branching fractions of Br(ψ(2S) →π^0hc) and Br(hc →γηc) are the first measurements. Surprisingly, the decays of Xc1→φφ, ωω, and ωφ are firstly observed in BESⅢ data.
平荣刚
关键词:J/Ψ
Mixing MC events in a reactor neutrino experiment
2013年
In reactor neutrino experiments, the analysis of time correlations between different physical events is an important task. Such analysis can help to understand the physical mechanisms of the signal and background events as well as the details of event selection and background estimation. This study investigates a "sampling and mixing" method used for producing large MC data samples for the Daya Bay reactor neutrino experiment. We designed a simple, generic mixing algorithm and generated large MC data samples for physics analysis from several samples according to their respective event rates. Basic plots based on the mixed data are shown.
张一纯陈晓苏何苗黄性涛王萌李卫东张子平
Recent results on light hadron spectroscopy from BESⅡ
2008年
We reported the observation of Y(2175) in Фfo(980) mass spectrum in J/ψ → ηФfo(980) with fo(980) →π+π^- and the observation of a broad 1^-- resonance of K^+K^- mass in J/ψ→ K^+K^-π^0. The results from the partial wave analyses of J/ψ→γπ^+π^- and γπ^0π^0, as well as J/ψ →pK^-∧. are also presented.
沈肖雁
关键词:RESONANCE
Experimental sensitivity on searching for CP violation at BES-Ⅲ
2009年
The CP violation in the D system is predicted to be an unobserved level in the Standard Model. In this paper, we describe the method of searching for CP violation decay processes with the coherently produced D^0D^0 mesons from the ψ(3770) decay. The CP violation decay processes can be searched for at the BES-Ⅲ experiment. The experimental sensitivity for searching for the CP violation can reach about a 10^-4 level with a ψ(3770) data sample of about 20 fb^-1.
赵明刚荣刚马海龙张达华
大亚湾反应堆中微子实验被引量:25
2007年
中微子振荡是目前唯一超出粒子物理标准模型的新现象,它证明了中微子质量不为零,对粒子物理、天体物理与宇宙学均有非常重要的意义.在描述中微子振荡的6个参数中,目前仍有两个未知:交叉混合角θ13与CP相角δ.作者建议在大亚湾反应堆附近建设一个中微子实验站,测量混合角sin22θ13在90%的置信度下达到0.01的精度,较过去的实验提高近一个数量级.这将对中微子物理的未来发展提供方向性指导,特别是对理解宇宙中“反物质消失之谜”具有重要意义.
王贻芳
关键词:中微子探测器振荡反物质
水基契伦科夫量能器单元的蒙特卡罗模拟被引量:1
2003年
详细描述了作为中微子探测器的水基契伦科夫量能器单元的结构,并用GEANT4软件包对水箱单元契伦科夫光的光学过程做了仔细的蒙特卡罗模拟,结果显示水箱的设计是合理的,且此结果对探测器设计与优化具有重要意义。
陈明君张峰王贻芳
关键词:蒙特卡罗模拟优化设计
Measurement of J/ψ decays into Λ■ π^+π^-
2012年
Based on 58 million J/ψ events collected by the BESⅡ detector at the BEPC, J/ψ→ΛΛ π+π- is observed for the first time. The branching fraction is measured to be Br(J/ψ→ΛΛ π+π-)=(4.30±0.13±0.99)×10-3, excluding the decays to intermediate states, namely J/ψ→Ξ-Ξ+, J/ψ→Σ(1385)-Σ(1385)+, and J/ψ→Σ(1385)+Σ(1385)-. The branching fractions for these intermediate resonance channels are measured to be:Br(J/ψ→Ξ-Ξ+)=(0.90±0.03±0.18)×10-3, Br(J/ψ→Σ(1385)-Σ(1385)+)=(1.23±0.07±0.30)×10-3,and Br(J/ψ→Σ(1385)+Σ(1385)-)=(1.50±0.08±0.38)×10-3, respectively. The angular distribution is of the form dN/d(cosθ)α(1+αcos2θ) with α=(0.35±0.29±0.06) for J/ψ→Ξ-Ξ+, α=(-0.54±0.22±0.10) for J/ψ→Σ(1385)-Σ(1385)+, and α=(-0.35±0.29±0.06) for J/ψ→Σ(1385)+Σ(1385)-.
阿布里克木.麦迪娜白景芝白羽班勇蔡啸陈宏芳陈和生陈江川陈进陈元柏陈初萍戴又善邓子艳杜书先方建傅成栋高原宁顾运厅郭子敬F.A.Huarris何康林何瑁衡月昆胡海明T.Hussain胡涛黄光顺黄性涛黄燕萍季晓斌江晓山焦健斌金大鹏金山李刚李海波李金李蕾李仁英李卫东李卫国李晓玲李小男李学潜梁勇飞刘北江刘春秀刘芳刘峰刘宏邦刘怀民刘觉平刘倩刘荣光刘振安吕峰鲁公儒吕军光罗成林马凤才马海龙马秋海M.Q.A.Malik毛泽普莫晓虎聂晶S.L.Olsen平荣刚邱进发荣刚阮向东单连友尚雷沈成平沈肖雁盛华义孙海生孙胜森孙永昭孙志嘉唐晓田俊平G.S.Varner万霞王岚王亮亮王灵淑王平王佩良王贻芳王铮王至勇魏诚林魏代会吴宁许国发俆新平俆晔阎沐霖杨洪勋杨明杨永栩叶铭汉叶云秀喻纯旭苑长征袁野曾云张丙新张炳云张长春张达华张华桥章红宇张家文张建勇张学尧张一云张子平赵京伟赵明刚赵平平赵政国郑波郑海青郑建平郑志鹏钟彬周莉朱科军朱启明朱兴旺朱永生朱自安邹冰松
ψ(3770)精细扫描数据积分亮度的测量(英文)
2007年
工作在北京正负电子对撞机(BEPC)上的北京谱议(BES),于2003年12月在质心系能量从3.660到3.897 GeV区间内67个能量点上收集了数据,我们测量了此67个能量点数据样本的积分亮度。数据样本对应的总的积分亮度为(5550.96±13.56±108.24)nb-1。
赵明刚荣刚马海龙陈江川张达华
共1页<1>
聚类工具0