用新的观测方法测量低多重数系统$ππx$的强度干涉
Measuring intensity interference in a low multiplicity system $ππx$ with a new observing method
摘要：
由于存在样本减少和引入额外和不必要的拟合参数等问题，以往提出的利用事件混合技术测量极低多重数排他反应中玻色-爱因斯坦关联（BEC）的观测方法仍不能令人满意。本文提出了一种事件混合方法，采用一种新的混合切割，即能量和程切割（ESR），研究了三个末态粒子中只有两个相同π介子的反应中的两π介子玻色-爱因斯坦关联（BEC）.这种混合方法利用两π介子的能量和特性来控制混合过程，不需要消除任何原始事件。数值模拟表明，这种新的BEC观测方法的可行性。
英文摘要：
Prior proposed observing approaches using event mixing technique for Bose-Einstein correlations (BEC) measurements in exclusive reactions with very low multiplicities are still unsatisfactory due to the problems of sample reduction and introducing extra and unnecessary fitting parameters. We here propose an event mixing method with a new mixing cut, named energy sum range (ESR) cut, to investigate two-pion Bose-Einstein correlations (BEC) in reactions with only two identical pions among three final state particles. This mixing method employs two-pion energy sum characteristic to control the mixing procedures, with no requirement on eliminating any original events. Numerical simulations are performed to show the viability of this new BEC observing method.
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