Impact of the Coulomb field on charged-pion spectra in few-GeV heavy-ion collisions
- Adamczewski-Musch, J.
- Arnold, O.
- Behnke, C.
- Belounnas, A.
- Belyaev, A.
- Berger-Chen, J. C.
- Blanco, A.
- Blume, C.
- Böhmer, M.
- Bordalo, P.
- Chernenko, S.
- Chlad, L.
- Ciepał, Izabela
- Deveaux, C.
- Dreyer, J.
- Epple, E.
- Fabbietti, L.
- Fateev, O.
- Filip, P.
- Fonte, P.
- Franco, C.
- Friese, J.
- Fröhlich, I.
- Galatyuk, T.
- Garzón, J. A.
- Gernhäuser, R.
- Golubeva, M.
- Greifenhagen, R.
- Guber, F.
- Gumberidze, M.
- Harabasz, Szymon
- Heinz, T.
- Hennino, T.
- Hlavac, S.
- Höhne, C.
- Holzmann, R.
- Ierusalimov, A.
- Ivashkin, A.
- Kämpfer, B.
- Karavicheva, T.
- Kardan, B.
- Koenig, I.
- Koenig, W.
- Kohls, M.
- Kolb, B. W.
- Korcyl, Grzegorz
- Kornakov, G.
- Kornas, F.
- Kotte, R.
- Kugler, A.
- Kunz, T.
- Kurepin, A.
- Kurilkin, A.
- Kurilkin, P.
- Ladygin, V.
- Lalik, Rafał
- Lapidus, K.
- Lebedev, A.
- Linev, S.
- Lopes, L.
- Lorenz, M.
- Mahmoud, T.
- Maier, L.
- Malige, Akshay
- Mangiarotti, A.
- Markert, J.
- Matulewicz, T.
- Maurus, S.
- Metag, V.
- Michel, J.
- Mihaylov, D. M.
- Morozov, S.
- Müntz, C.
- Münzer, R.
- Nabroth, M.
- Naumann, L.
- Nowakowski, Krzysztof
- Parpottas, Y.
- Parschau, M.
- Pechenov, V.
- Pechenova, O.
- Petukhov, O.
- Piasecki, K.
- Pietraszko, J.
- Przygoda, Witold
- Pysz, K.
- Ramos, S.
- Ramstein, B.
- Rathod, Narendra
- Reshetin, A.
- Rodriguez-Ramos, P.
- Rosier, P.
- Rost, A.
- Rustamov, A.
- Sadovsky, A.
- Salabura, Piotr
- Scheib, T.
- Schild, N.
- Schuldes, H.
- Schwab, E.
- Scozzi, F.
- Seck, F.
- Sellheim, P.
- Selyuzhenkov, I.
- Siebenson, J.
- Silva, L.
- Singh, Udai
- Smyrski, Jerzy
- Sobolev, Yu. G.
- Spataro, S.
- Spies, S.
- Ströbele, H.
- Stroth, J.
- Sturm, C.
- Sumara, Konrad
- 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.
DOIAbstract
In nuclear collisions the incident protons generate a Coulomb field which acts on produced charged particles. The impact of these interactions on charged-pion transverse-mass and rapidity spectra, as well as on pion–pion momentum correlations is investigated in Au + Au collisions at $\sqrt{^{S}NN}$ = 2.4 GeV. We show that the low-m$_{t}$ region (m$_{t}$ < 0.2 GeV / c$^{2}$) can be well described with a Coulomb-modified Boltzmann distribution that also takes changes of the Coulomb field during the expansion of the fireball into account. The observed centrality dependence of the fitted mean Coulomb potential energy deviates strongly from a $A_{part}^{2/3}$ scaling, indicating that, next to the fireball, the non-interacting charged spectators ...
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