1.76A GeV能量下Ar+KCl碰撞中的双电子产生
核实验
2011-08-11 v2
摘要
我们展示了在1.76A GeV能量下Ar+KCl碰撞中双电子产生的结果。首次在远低于自由核子-核子碰撞产生阈值的轰击能量下，在重离子反应中重建了ω介子。提取了ω介子的多重性，并将其与其他粒子(特别是φ介子)的产额进行了比较。在中等e+e-不变质量区域，我们发现双电子产额相对于基本核子-核子反应参考谱有显著增强，表明核介质非平凡效应的出现。在三个不变质量区间内重建了横质量谱和角分布。在前者中，高质量对发现了出乎意料的大斜率。后者，特别是螺旋角分布，在很大程度上与预期一致，即中等质量区域的双电子鸡尾酒主要由Δ达利兹衰变主导。
引用
@article{arxiv.1103.0876,
title = {Dielectron production in Ar+KCl collisions at 1.76A GeV},
author = {G. Agakishiev and A. Balanda and D. Belver and A. Belyaev and A. Blanco and M. Böhmer and J. L. Boyard and P. Cabanelas and E. Castro and S. Chernenko and T. Christ and M. Destefanis and F. Dohrmann and A. Dybczak and T. Eberl and E. Epple and L. Fabbbietti and O. Fateev and P. Finocchiaro and P. Fonte and J. Friese and I. Fröhlich and T. Galatyuk and J. A. Garzon and R. Gernhäuser and C. Gilardi and M. Golubeva and D. Gonzalez-Díaz and F. Guber and M. Gumberidze and T. Heinz and T. Hennino and R. Holzmann and P. Huck and I. Iori and A. Ivashkin and M. Jurkovic and B. Kämpfer and K. Kanaki and T. Karavicheva and I. Koenig and W. Koenig and B. W. Kolb and R. Kotte and A. Krasa and F. Krizek and R. Krücken and H. Kuc and W. Kühn and A. Kugler and A. Kurepin and S. Lang and J. S. Lange and K. Lapidus T. Liu and L. Lopes and M. Lorenz and L. Maier and A. Mangiarotti and J. Markert and V. Metag and B. Michalska and J. Michel and E. Moriniere and J. Mousa and C. Müntz and L. Naumann and J. Otwinowski and Y. C. Pachmayer and M. Palka and V. Pechenov and O. Pechenova and J. Pietraszko and W. Przygoda and B. Ramstein and A. Reshetin and A. Rustamov and A. Sadovsky and B. Sailer and P. Salabura and A. Schmah and E. Schwab and J. Siebenson and Yu. G. Sobolev and S. Spataro and B. Spruck and H. Ströbele and J. Stroth and C. Sturm and A. Tarantola and K. Teilab and P. Tlusty and M. Traxler and R. Trebacz and H. Tsertos and V. Wagner and M. Weber and C. Wendisch and M. Wisniowski and J. Wüstenfeld and S. Yurevich and Y. Zanevsky},
journal= {arXiv preprint arXiv:1103.0876},
year = {2011}
}
备注
16 pages, 14 figures, accepted for publication by Phys. Rev. C