论文标题
在$ \ sqrt {\ textit {s} _ {_ {\ rm nn}}} $ = 2.76 TEV中
Differential two-particle number and momentum correlations with the AMPT, UrQMD, and EPOS models in Pb-Pb collisions at $\sqrt{\textit{s}_{_{\rm NN}}}$= 2.76 TeV
论文作者
论文摘要
我们报告了与电荷无关（CI）和电荷依赖性（CD）两粒子差异相关函数的研究，$ r_ {2} \ left（δη，Δφ\ right）$以及横向动量相关功能，$ p_2 \ weft（Δη，Δφ\右）$ pect in fuldect in used them used proged ppp pb pb pb ins in f \ pb ins in f \ pb ins ins in f \ pb pb ins ins in f \ pb pb ins ins in f \ pb pb ins ins ins in f \ pb。 Energy $ \ sqrt {s _ {\ rm nn}}} = $ 2.76 TEV，带有URQMD，AMPT和EPOS模型。 $ r_2 $的模型预测和$ P_2 $相关功能在选定的横向动量范围内提供了包含的充电Hadron（$ H^\ pm $），并且具有完整的Azimuthal覆盖范围，并在伪行为范围$ | |η| <1.0 $中。我们将这些预测的强度，形状，尤其是相关功能的宽度与爱丽丝协作对这些可观察物的最新测量值进行了比较。我们的分析表明，$ R_2 $和$ P_2 $相关功能的比较研究为理解PB-PB碰撞中粒子产生的有价值的见解提供了宝贵的见解。我们特别发现，这些模型对这三个可观察到的预测具有数量不同的预测，但没有复制爱丽丝协作报告的测量相关函数。必须考虑模型中的量子数量保护，尤其是电荷保护，是必须重现数量和横向动量相关函数的详细测量。
We report studies of charge-independent (CI) and charge-dependent (CD) two-particle differential number correlation functions, $R_{2} \left( Δη, Δφ\right)$, and transverse momentum correlation functions, $P_2 \left( Δη, Δφ\right)$ of charged particles produced in \PbPb\ collisions at the LHC centre-of-mass energy $\sqrt{s_{\rm NN}} =$ 2.76 TeV with the UrQMD, AMPT and EPOS models. Model predictions for $R_2$ and $P_2$ correlation functions are presented for inclusive charged hadrons ($h^\pm$) in selected transverse momentum ranges and with full azimuthal coverage in the pseudorapidity range $|η|< 1.0$. We compare these predictions for the strength, shape, and particularly the width of the correlation functions with recent measurements of these observables by the ALICE collaboration. Our analysis indicate that comparative studies of $R_2$ and $P_2$ correlation functions provide valuable insight towards the understanding of particle production in Pb--Pb collisions. We find, in particular, that these models have quantitatively different predictions for these three observables but none reproduce the measured correlation functions reported by the ALICE collaboration. Accounting for quantum number conservation in models, particularly charge conservation, is mandatory to reproduce the detailed measurements of number and transverse momentum correlation functions.
