论文标题

相关的Pion-Proton对排放热和密集的QCD物质

Correlated pion-proton pair emission off hot and dense QCD matter

论文作者

Adamczewski-Musch, J., Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., B"ohmer, M., Bordalo, P., Chernenko, S., Chlad, L., Ciepal, I., Deveaux, C., Dreyer, J., 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., Malige, A., 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., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramos, S., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Sobolev, Yu. G., Spataro, S., Spies, S., Str"obele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Tsertos, H., Usenko, E., Wagner, V., Wendisch, C., Wiebusch, M. G., Wirth, J., Wojcik, D., Zanevsky, Y., Zumbruch, P.

论文摘要

在这封信中,我们报告了从20亿au+au碰撞\ sqrt {s_ {nn}} = 2.42 GEV收集的GEV的第一个多差异测量。在这种能量状态下,δ(1232)共振的种群在能量的固有激发能量和火球中的黑龙的动能之间发挥了重要作用。相关的πp对的三重差分D3N/dmπpdptdy分布已通过使用迭代方法减去πp组合背景来确定。 δ(1232)质量区域中不变的质量分布显示出与带有真空宽度和质量的Breit-Wigner函数的强偏差。相关pion-proton对的产率表现出复杂的同胞,速度和横向摩托依赖性。在不变的质量范围1.1 <minv(GeV/c2)<1.4中,发现产率在π+p和π-p对中相似,并且遵循功率定律<Apply>^α,其中<antair>是参与核子的平均数量。指数α在很大程度上取决于对横向动量(PT),而其PT集成和电荷平均值为α= 1.5 \ pm 0.08Stat \ pm 0.2Sys。

In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES. In this energy regime the population of Δ(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dMπpdpTdy distributions of correlated πp pairs have been determined by subtracting the πp combinatorial background using an iterative method. The invariant-mass distributions in the Δ(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1 < Minv (GeV/c2) < 1.4, the yield is found to be similar for π+p and π-p pairs, and to follow a power law <Apart>^α, where <Apart> is the mean number of participating nucleons. The exponent α depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is α = 1.5 \pm 0.08stat \pm 0.2sys.

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