热密QCD物质中关联π介子-质子对发射
核实验
2021-06-09 v1
摘要
在本快报中，我们报道了基于HADES采集的20亿次Au+Au碰撞（√s_NN = 2.42 GeV）中关联π介子-质子对的首次多重微分测量。在该能区，Δ(1232)共振态的布居在火球内禀激发能与强子动能之间的能量分配方式上起着重要作用。利用迭代法扣除πp组合背景，确定了关联πp对的三重微分d3N/dM_{πp}dp_Tdy分布。Δ(1232)质量区中的不变质量分布显示出与具有真空宽度和质量的Breit-Wigner函数的强烈偏离。关联π介子-质子对的产额表现出复杂的同位旋、快度和横动量依赖性。在不变质量范围1.1 < M_inv (GeV/c²) < 1.4内，发现π⁺p与π⁻p对的产额相近，并遵循幂律<N_part>^α，其中<N_part>为平均参与核子数。指数α强烈依赖于对的横动量(p_T)，而其p_T积分且电荷平均值为α = 1.5 ± 0.08_stat ± 0.2_sys。
引用
@article{arxiv.2012.01351,
title = {Correlated pion-proton pair emission off hot and dense QCD matter},
author = {J. Adamczewski-Musch and O. Arnold and C. Behnke and A. Belounnas and A. Belyaev and J. C. Berger-Chen and A. Blanco and C. Blume and M. B"ohmer and P. Bordalo and S. Chernenko and L. Chlad and I. Ciepal and C. Deveaux and J. Dreyer and E. Epple and L. Fabbietti and O. Fateev and P. Filip and P. Fonte and C. Franco and J. Friese and I. Fr"ohlich and T. Galatyuk and J. A. Garzon and R. Gernh"auser and M. Golubeva and R. Greifenhagen and F. Guber and M. Gumberidze and S. Harabasz and T. Heinz and T. Hennino and S. Hlavac and C. H"ohne and R. Holzmann and A. Ierusalimov and A. Ivashkin and B. K"ampfer and T. Karavicheva and B. Kardan and I. Koenig and W. Koenig and M. Kohls and B. W. Kolb and G. Korcyl and G. Kornakov and F. Kornas and R. Kotte and A. Kugler and T. Kunz and A. Kurepin and A. Kurilkin and P. Kurilkin and V. Ladygin and R. Lalik and K. Lapidus and A. Lebedev and L. Lopes and M. Lorenz and T. Mahmoud and L. Maier and A. Malige and A. Mangiarotti and J. Markert and T. Matulewicz and S. Maurus and V. Metag and J. Michel and D. M. Mihaylov and S. Morozov and C. M"untz and R. M"unzer and L. Naumann and K. Nowakowski and Y. Parpottas and V. Pechenov and O. Pechenova and O. Petukhov and K. Piasecki and J. Pietraszko and W. Przygoda and K. Pysz and S. Ramos and B. Ramstein and N. Rathod and A. Reshetin and P. Rodriguez-Ramos and P. Rosier and A. Rost and A. Sadovsky and P. Salabura and T. Scheib and H. Schuldes and E. Schwab and F. Scozzi and F. Seck and P. Sellheim and I. Selyuzhenkov and J. Siebenson and L. Silva and U. Singh and J. Smyrski and Yu. G. Sobolev and S. Spataro and S. Spies and H. Str"obele and J. Stroth and C. Sturm and O. Svoboda and M. Szala and P. Tlusty and M. Traxler and H. Tsertos and E. Usenko and V. Wagner and C. Wendisch and M. G. Wiebusch and J. Wirth and D. Wojcik and Y. Zanevsky and P. Zumbruch},
journal= {arXiv preprint arXiv:2012.01351},
year = {2021}
}
备注
9 pages, 9 figures