Dielectron production in Au+Au collisions at √（s_NN）= 200 GeV
Dielectron production in Au+Au collisions at √（s_NN）= 200 GeV
复制标题
Au+Au 碰撞中 √(s_NN) = 200 GeV 时双电子的产生
DOI：
10.1103/physrevc.93.014904
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发表时间：
2016
影响因子：
3.1
通讯作者：
A. Taketani et al.
中科院分区：
文献类型：
--
作者：
A. Adare;K. Kurita;T. Murakami;A. Taketani et al.
我们目前测量的生产中快在碰撞在GeV。在PHENIX探测器接受范围内，研究了最小偏差和五个中心性类的质量（）和对横向动量（）的不变产额。将产量与已知来源的预期进行比较。在低质量区（），有一个增强，随着中心性增加，并分布在整个测量的对范围。它是显着小于先前报道的PHENIX实验和金额或最小偏置碰撞时，开放的重味贡献计算与pythiacetamc @nlo，分别。包含的质量和分布，以及中心性的依赖性，很好地再现模型计算的增强主要源于熔化的theson共振作为系统的手征对称性恢复的方法。在中等质量区域（），数据暗示除了重味介子的半轻子衰变的产额之外，还有一个重要的贡献。
We present measurements ofproduction at midrapidity incollisions atGeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass () and pair transverse momentum () for minimum bias and for five centrality classes. Theyield is compared to the expectations from known sources. In the low-mass region () there is an enhancement that increases with centrality and is distributed over the entire pairrange measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts toor tofor minimum bias collisions when the open heavy-flavor contribution is calculated withpythiaormc@nlo, respectively. The inclusive mass anddistributions, as well as the centrality dependence, are well reproduced by model calculations where the enhancement mainly originates from the melting of themeson resonance as the system approaches chiral symmetry restoration. In the intermediate-mass region (), the data hint at a significant contribution in addition to the yield from the semileptonic decays of heavy-flavor mesons.