Finite – size effects on two – particle production in continuous and discrete spectrum
Finite – size effects on two – particle production in continuous and discrete spectrum
复制标题
连续和离散光谱中双粒子产生的有限尺寸效应
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
R. Lednický
中科院分区：
文献类型：
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作者：
R. Lednický
讨论了粒子产生区的有限时空范围对高能束在薄靶中产生的强子原子寿命测量的影响。特别是，研究发现，在欧洲核子研究中心的DIRAC实验中忽视这种对钚寿命测量的影响可能会导致寿命高估，达到预期10%统计误差的水平。有人认为，在相同的实验条件下获得的相同的粒子的相关性的数据，连同运输代码模拟，允许减少提取的寿命的系统误差到一个可接受的水平。在计算有限尺寸效应时，由于忽略了c.m.s.对中不相等的发射时间而引起的理论系统误差，时空相干性和剩余电荷被示出为可以忽略。
The effect of a finite space–time extent of particle production region on the lifetime measurement of hadronic atoms produced by a high energy beam in a thin target is discussed. Particularly, it is found that the neglect of this effect on the pionium lifetime measurement in the experiment DIRAC at CERN could lead to the lifetime overestimation on the level of the expected 10% statistical error. It is argued that the data on correlations of identical particles obtained in the same experimental conditions, together with transport code simulation, allow to diminish the systematic error in the extracted lifetime to an acceptable level. The theoretical systematic errors arising in the calculation of the finite–size effect due to the neglect of non-equal emission times in the pair c.m.s., the space–time coherence and the residual charge are shown to be negligible.