$ \ sqrt {s_ {nn}} $ = 2.4 gev au+au collisions in $ \ sqrt {s_ {nn}}中的质子数波动

论文标题

$ \ sqrt {s_ {nn}} $ = 2.4 gev au+au collisions in $ \ sqrt {s_ {nn}}中的质子数波动

Proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions studied with HADES

论文作者

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Biernat, J., Blanco, A., Blume, C., B"ohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Fr"ohlich, I., Galatyuk, T., Garzon, J. A., Gernh"auser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., H"ohne, C., Holzmann, R., Ierusalimov, A., Ivashkin, A., K"ampfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornakov, G., Kornas, F., Kotte, R., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Kurilkin, P., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Mihaylov, D. M., Morozov, S., M"untz, C., M"unzer, R., Naumann, L., Nowakowski, K., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Ramos, S., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Sobolev, Yu. G., Spataro, S., Spies, S., Str"obele, H., Stroth, J., Strzempek, P., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Zanevsky, Y., Zumbruch, P.

论文摘要

我们介绍了$ \ sqrt {s_ {nn}} $ = 2.4 GEV au+au碰撞在GSI处测量的质子数量波动的分析。借助IQMD传输模型（包括核簇）进行的广泛检测器模拟，已经研究了影响观察到的质子累积剂的各种滋扰作用。接受和效率校正已被应用于细粒度快速和横向动量箱的函数，并考虑了局部轨道密度依赖性。接下来，已经考虑了特定中心性选择中体积变化的影响，并且已将超越领先的校正应用于数据。效率和体积校正了质子的数量矩和累积量n = 1，。。。，4是作为中心性和相位箱以及相应的相关器C_N获得的。我们发现，观察到的相关器显示质量缩放的质量，即质子的平均数量，即$ c_n \ propto <n>^n $，这表明在动量空间中大部分是远距离的多粒子相关性。我们还将结果与Au+au碰撞数据进行了比较，在类似的中心的RHIC中获得，但较高的$ \ sqrt {s_ {nn}} $。

We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With the help of extensive detector simulations done with IQMD transport model events including nuclear clusters, various nuisance effects influencing the observed proton cumulants have been investigated. Acceptance and efficiency corrections have been applied as a function of fine grained rapidity and transverse momentum bins, as well as considering local track density dependencies. Next, the effects of volume changes within particular centrality selections have been considered and beyond-leading-order corrections have been applied to the data. The efficiency and volume corrected proton number moments and cumulants Kn of orders n = 1, . . . , 4 have been obtained as a function of centrality and phase-space bin, as well as the corresponding correlators C_n . We find that the observed correlators show a power-law scaling with the mean number of protons, i.e. $C_n \propto <N>^n$, indicative of mostly long-range multi-particle correlations in momentum space. We also present a comparison of our results with Au+Au collision data obtained at RHIC at similar centralities, but higher $\sqrt{s_{NN}}$.

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