$\sqrt{s_{NN}}$=200 GeV 金-金碰撞中的双电子产生
核实验
2019-08-13 v2
摘要
我们给出了在 = 200 GeV 的金-金碰撞中，中心快度区域的 产生测量结果。在 PHENIX 探测器接受度内，研究了在宽质量范围 ( 5 GeV/) 和双轻子横动量范围 ( 5 GeV/) 内的不变产额，涵盖了最小偏差和五个中心度类别。将 \ee 产额与已知源的预期进行了比较。在低质量区域 (--0.76 GeV/)，存在一个随中心度增加而增强，并分布在整个测量的双轻子 \pt 范围内的超出。该超出显著小于 PHENIX 实验先前报告的值，当分别使用 {\sc pythia} 或 {\sc mc@nlo} 计算开放重味贡献时，对于最小偏差碰撞，其值为 或 。模型计算很好地再现了不变质量谱和 分布以及中心度依赖关系，其中超出主要来源于系统接近手征对称性恢复时 介子共振态的融化。在中间质量区域 ( = 1.2--2.8 GeV/)，数据暗示除了重味介子半轻子衰变的产额之外，还存在显著的额外贡献。
引用
@article{arxiv.1509.04667,
title = {Dielectron production in Au$+$Au collisions at $\sqrt{s_{NN}}$=200 GeV},
author = {A. Adare and C. Aidala and N. N. Ajitanand and Y. Akiba and R. Akimoto and J. Alexander and M. Alfred and H. Al-Ta'ani and A. Angerami and K. Aoki and N. Apadula and Y. Aramaki and H. Asano and E. C. Aschenauer and E. T. Atomssa and R. Averbeck and T. C. Awes and B. Azmoun and V. Babintsev and M. Bai and N. S. Bandara and B. Bannier and K. N. Barish and B. Bassalleck and S. Bathe and V. Baublis and S. Baumgart and A. Bazilevsky and M. Beaumier and S. Beckman and R. Belmont and A. Berdnikov and Y. Berdnikov and D. S. Blau and J. S. Bok and K. Boyle and M. L. Brooks and J. Bryslawskyj and H. Buesching and V. Bumazhnov and S. Butsyk and S. Campbell and P. Castera and C. -H. Chen and C. Y. Chi and M. Chiu and I. J. Choi and J. B. Choi and S. Choi and R. K. Choudhury and P. Christiansen and T. Chujo and O. Chvala and V. Cianciolo and Z. Citron and B. A. Cole and M. Connors and M. Csanád and T. Csörgő and S. Dairaku and D. Danley and A. Datta and M. S. Daugherity and G. 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Reynolds and V. Riabov and Y. Riabov and E. Richardson and T. Rinn and D. Roach and G. Roche and S. D. Rolnick and M. Rosati and Z. Rowan and J. G. Rubin and B. Sahlmueller and N. Saito and T. Sakaguchi and H. Sako and V. Samsonov and M. Sano and M. Sarsour and S. Sato and S. Sawada and B. Schaefer and B. K. Schmoll and K. Sedgwick and R. Seidl and A. Sen and R. Seto and P. Sett and A. Sexton and D. Sharma and I. Shein and T. -A. Shibata and K. Shigaki and M. Shimomura and K. Shoji and P. Shukla and A. Sickles and C. L. Silva and D. Silvermyr and K. S. Sim and B. K. Singh and C. P. Singh and V. Singh and M. Slunečka and M. Snowball and R. A. Soltz and W. E. Sondheim and S. P. Sorensen and I. V. Sourikova and P. W. Stankus and E. Stenlund and M. Stepanov and A. Ster and S. P. Stoll and T. Sugitate and A. Sukhanov and T. Sumita and J. Sun and J. Sziklai and E. M. Takagui and A. Takahara and A. Taketani and Y. Tanaka and S. Taneja and K. Tanida and M. J. Tannenbaum and S. Tarafdar and A. Taranenko and E. Tennant and H. Themann and R. Tieulent and A. Timilsina and T. Todoroki and L. Tomášek and M. Tomášek and H. Torii and C. L. Towell and R. Towell and R. S. Towell and I. Tserruya and Y. Tsuchimoto and T. Tsuji and C. Vale and H. W. van Hecke and M. Vargyas and E. Vazquez-Zambrano and A. Veicht and J. Velkovska and R. Vértesi and M. Virius and A. Vossen and V. Vrba and E. Vznuzdaev and X. R. Wang and D. Watanabe and K. Watanabe and Y. Watanabe and Y. S. Watanabe and F. Wei and R. Wei and A. S. White and S. N. White and D. Winter and S. Wolin and C. L. Woody and M. Wysocki and B. Xia and L. Xue and S. Yalcin and Y. L. Yamaguchi and R. Yang and A. Yanovich and J. Ying and S. Yokkaichi and J. H. Yoo and I. Yoon and Z. You and I. Younus and H. Yu and I. E. Yushmanov and W. A. Zajc and A. Zelenski and S. Zhou and L. Zou},
journal= {arXiv preprint arXiv:1509.04667},
year = {2019}
}
备注
447 authors, 38 pages, 38 figures, 9 tables, 2010 data. v2 is Phys. Rev. C accepted version. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html