【摘要】：玻色-愛(ài)因斯坦關(guān)聯(lián)(BEC)可以用于測(cè)量粒子出射區(qū)的時(shí)間空間性質(zhì),事件混合方法是用于觀測(cè)BEC效應(yīng)的常用手段,對(duì)于相對(duì)論能區(qū)重離子碰撞等可以產(chǎn)生大量全同末態(tài)粒子的反應(yīng),這種方法具有獨(dú)特優(yōu)勢(shì).但是對(duì)于末態(tài)粒子數(shù)非常有限的反應(yīng),守恒關(guān)系、共振態(tài)和一些其他原因引起的關(guān)聯(lián),對(duì)事件混合方法產(chǎn)生不可忽視的干擾,事件混合在消除玻色-愛(ài)因斯坦關(guān)聯(lián)的同時(shí)也消除了其他所有的關(guān)聯(lián),嚴(yán)重制約了BEC研究.本文探索一種適合末態(tài)只有兩個(gè)全同玻色子的三體反應(yīng)系統(tǒng)的事件混合方法,提出了五種可行的事件混合限制條件,采用數(shù)值模擬研究了不同限制條件對(duì)事件混合的效果,甄別出最優(yōu)的限制條件.測(cè)試結(jié)果顯示,當(dāng)要求混合事件的丟失質(zhì)量與原始反應(yīng)一致,并將原始事件樣本中玻色子能量高于某一給定值的事件剔除掉,這種限制條件下得到的事件混合結(jié)果最優(yōu),可以用于觀測(cè)BEC效應(yīng).另外,要求兩個(gè)交換玻色子的方位角一致時(shí)得到的結(jié)果也較優(yōu),相比前者,此限制條件不需要?jiǎng)h除一部分事件,可以得到更好的統(tǒng)計(jì)誤差.
[Abstract]:Bose-Einstein correlation (bec) can be used to measure the temporal and spatial properties of the exiting region of particles. The event-mixing method is commonly used to observe the bec effect. For relativistic energy region heavy ion collisions and other reactions can produce a large number of fully identical particles, this method has a unique advantage. But for the very limited number of final particles, the conserved relation, the resonance, and some other causes, there is no negligible interference with the event-mixing method. Event mixing eliminates the Bose-Einstein association and eliminates all other associations, seriously constraining bec research. In this paper, an event-mixing method suitable for a three-body reaction system with only two fully identical bosons in the final state is explored. Five feasible event-mixing constraints are proposed, and the effects of different limiting conditions on the event-mixing are studied by numerical simulation. Identify the optimal constraints. The test results show that when the loss quality of the mixed event is consistent with the original response, and the event whose boson energy is higher than a given value in the original event sample is eliminated, the mixed result of the event is optimal under this condition. It can be used to observe bec effect. In addition, the result obtained when the azimuth of two exchange bosons is the same is better. Compared with the former, this restriction condition does not need to delete some events, so it can get better statistical error.
【作者單位】： 中國(guó)工程物理研究院流體物理研究所;
【分類號(hào)】：O572.2

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