Correlated pion-proton pair emission off hot and dense QCD matter
Creators: name: Adamczewski-Musch, J.
name: Arnold, O.
name: Behnke, C.
name: Belounnas, A.
name: Belyaev, A.
name: Berger-Chen, J. C.
name: Blanco, A.
name: Blume, C.
name: B"ohmer, M.
name: Bordalo, P.
name: Chernenko, S.
name: Chlad, L.
name: Ciepal, I.
name: Deveaux, C.
name: Dreyer, J.
name: Epple, E.
name: Fabbietti, L.
name: Fateev, O.
name: Filip, P.
name: Fonte, P.
name: Franco, C.
name: Friese, J.
name: Fr"ohlich, I.
name: Galatyuk, T.
name: Garzon, J. A.
name: Gernh"auser, R.
name: Golubeva, M.
name: Greifenhagen, R.
name: Guber, F.
name: Gumberidze, M.
name: Harabasz, S.
name: Heinz, T.
name: Hennino, T.
name: Hlavac, S.
name: H"ohne, C.
name: Holzmann, R.
name: Ierusalimov, A.
name: Ivashkin, A.
name: K"ampfer, B.
name: Karavicheva, T.
name: Kardan, B.
name: Koenig, I.
name: Koenig, W.
name: Kohls, M.
name: Kolb, B. W.
name: Korcyl, G.
name: Kornakov, G.
name: Kornas, F.
name: Kotte, R.
name: Kugler, A.
name: Kunz, T.
name: Kurepin, A.
name: Kurilkin, A.
name: Kurilkin, P.
name: Ladygin, V.
name: Lalik, R.
name: Lapidus, K.
name: Lebedev, A.
name: Lopes, L.
name: Lorenz, M.
name: Mahmoud, T.
name: Maier, L.
name: Malige, A.
name: Mangiarotti, A.
name: Markert, J.
name: Matulewicz, T.
name: Maurus, S.
name: Metag, V.
name: Michel, J.
name: Mihaylov, D. M.
name: Morozov, S.
name: M"untz, C.
name: M"unzer, R.
name: Naumann, L.
name: Nowakowski, K.
name: Parpottas, Y.
name: Pechenov, V.
name: Pechenova, O.
name: Petukhov, O.
name: Piasecki, K.
name: Pietraszko, J.
name: Przygoda, W.
name: Pysz, K.
name: Ramos, S.
name: Ramstein, B.
name: Rathod, N.
name: Reshetin, A.
name: Rodriguez-Ramos, P.
name: Rosier, P.
name: Rost, A.
name: Sadovsky, A.
name: Salabura, P.
name: Scheib, T.
name: Schuldes, H.
name: Schwab, E.
name: Scozzi, F.
name: Seck, F.
name: Sellheim, P.
name: Selyuzhenkov, I.
name: Siebenson, J.
name: Silva, L.
name: Singh, U.
name: Smyrski, J.
name: Sobolev, Yu. G.
name: Spataro, S.
name: Spies, S.
name: Str"obele, H.
name: Stroth, J.
name: Sturm, C.
name: Svoboda, O.
name: Szala, M.
name: Tlusty, P.
name: Traxler, M.
name: Tsertos, H.
name: Usenko, E.
name: Wagner, V.
name: Wendisch, C.
name: Wiebusch, M. G.
name: Wirth, J.
name: Wojcik, D.
name: Zanevsky, Y.
name: Zumbruch, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 &lt; Minv (GeV/c2) &lt; 1.4, the yield is found to be similar for π+p and π-p pairs, and to follow a power law ^α, where 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.
description: 9 pages, 9 figures