论文标题
中央$^7 $ be+$^9 $在Cern Super Proton Synchrotron上以方位角和伪的相关性的两粒子相关性
Two-particle correlations in azimuthal angle and pseudorapidity in central $^7$Be+$^9$Be collisions at the CERN Super Proton Synchrotron
论文作者
论文摘要
提出了二维$Δηδ节$空间中带电的强子对相关的测量。该分析基于总计3000万个中央be+在Na61/Shine检测器中观察到的CERN SPS的碰撞,用于事件束Momenta,为19 $ a $,30 $ a $,40 $ a $,75 $ a $和150 $ a $ a $ gev/$ c $。与符号和类似的电荷强子对进行了测量。将$ c(δη,δϕ)$相关函数与对每个核子相似的束相互作用的类似分析的结果进行了比较。背靠背相关性的一般趋势在中央be+collisions和p+p相互作用中相似,但由于组合背景增加而被抑制。将EPOS和IRQMD模型的预测与测量结果进行了比较。在中央be+碰撞中观察到$(δη,δϕ)=(0,0)$的增强的演变。这两个模型都不预测质子 - 蛋白质碰撞的几乎不存在,每个核能相同动量。
A measurement of charged hadron pair correlations in two-dimensional $ΔηΔϕ$ space is presented. The analysis is based on total 30 million central Be+Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19$A$, 30$A$, 40$A$, 75$A$, and 150$A$ GeV/$c$. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The $C(Δη,Δϕ)$ correlation functions were compared with results from a similar analysis on p+p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be+Be collisions and p+p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the EPOS and UrQMD models are compared to the measurements. Evolution of an enhancement around $(Δη,Δϕ) = (0,0)$ with incident energy is observed in central Be+Be collisions. It is not predicted by both models and almost non-existing in proton-proton collisions at the same momentum per nucleon.