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arXiv · 1811.06213

Identical pion intensity interferometry in central Au+Au collisions at 1.23A GeV

J. Adamczewski-Musch·O. Arnold·C. Behnke·A. Belounnas·A. Belyaev·J. C. Berger-Chen·J. Biernat·A. Blanco·C. Blume·M. Böhmer·P. Bordalo·S. Chernenko·L. Chlad·C. Deveaux·J. Dreyer·A. Dybczak·E. Epple·L. Fabbietti·O. Fateev·P. Filip·P. Fonte·C. Franco·J. Friese·I. Fröhlich·T. Galatyuk·J. A. Garzon·R. Gernhäuser·M. Golubeva·R. Greifenhagen·F. Guber·M. Gumberidze·S. Harabasz·T. Heinz·T. Hennino·S. Hlavac·C. Höhne·R. Holzmann·A. Ierusalimov·A. Ivashkin·B. Kämpfer·T. Karavicheva·B. Kardan·I. Koenig·W. Koenig·B. W. Kolb·G. Korcyl·G. Kornakov·R. Kotte·W. Kühn·A. Kugler·T. Kunz·A. Kurepin·A. Kurilkin·P. Kurilkin·V. Ladygin·R. Lalik·K. Lapidus·A. Lebedev·L. Lopes·M. Lorenz·T. Mahmoud·L. Maier·A. Mangiarotti·J. Markert·T. Matulewicz·S. Maurus·V. Metag·J. Michel·D. M. Mihaylov·S. Morozov·C. Müntz·R. Münzer·L. Naumann·K. N. Nowakowski·M. Palka·Y. Parpottas·V. Pechenov·O. Pechenova·O. Petukhov·K. Piasecki·J. Pietraszko·W. Przygoda·S. Ramos·B. Ramstein·A. Reshetin·P. Rodriguez-Ramos·P. Rosier·A. Rost·A. Sadovsky·P. Salabura·T. Scheib·H. Schuldes·E. Schwab·F. Scozzi·F. Seck·P. Sellheim·J. Siebenson·L. Silva·Yu. G. Sobolev·S. Spataro
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Abstract

We investigate identical pion HBT intensity interferometry for central Au+Au collisions at 1.23A GeV. High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ data are measured with HADES at SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta in the longitudinal-comoving system and parametrized as three-dimensional Gaussian distribution, are studied as function of transverse momentum. A substantial charge-sign difference of the source radii is found, particularly pronounced at low transverse momentum. The extracted Coulomb-corrected source parameters agree well with a smooth extrapolation of the center-of-mass energy dependence established at higher energies, extending the corresponding excitation functions down towards a very low energy. Our data would thus rather disfavour any strong energy dependence of the radius parameters in the low energy region.

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J. Adamczewski-Musch, O. Arnold, C. Behnke, A. Belounnas, A. Belyaev, J. C. Berger-Chen, J. Biernat, A. Blanco, C. Blume, M. Böhmer, P. Bordalo, S. Chernenko, L. Chlad, C. Deveaux, J. Dreyer, A. Dybczak, E. Epple, L. Fabbietti, O. Fateev, P. Filip, P. Fonte, C. Franco, J. Friese, I. Fröhlich, T. Galatyuk, J. A. Garzon, R. Gernhäuser, M. Golubeva, R. Greifenhagen, F. Guber, M. Gumberidze, S. Harabasz, T. Heinz, T. Hennino, S. Hlavac, C. Höhne, R. Holzmann, A. Ierusalimov, A. Ivashkin, B. Kämpfer, T. Karavicheva, B. Kardan, I. Koenig, W. Koenig, B. W. Kolb, G. Korcyl, G. Kornakov, R. Kotte, W. Kühn, A. Kugler, T. Kunz, A. Kurepin, A. Kurilkin, P. Kurilkin, V. Ladygin, R. Lalik, K. Lapidus, A. Lebedev, L. Lopes, M. Lorenz, T. Mahmoud, L. Maier, A. Mangiarotti, J. Markert, T. Matulewicz, S. Maurus, V. Metag, J. Michel, D. M. Mihaylov, S. Morozov, C. Müntz, R. Münzer, L. Naumann, K. N. Nowakowski, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, O. Petukhov, K. Piasecki, J. Pietraszko, W. Przygoda, S. Ramos, B. Ramstein, A. Reshetin, P. Rodriguez-Ramos, P. Rosier, A. Rost, A. Sadovsky, P. Salabura, T. Scheib, H. Schuldes, E. Schwab, F. Scozzi, F. Seck, P. Sellheim, J. Siebenson, L. Silva, Yu. G. Sobolev, S. Spataro. 2018-11-15. Identical pion intensity interferometry in central Au+Au collisions at 1.23A GeV. https://doi.org/10.1016/j.physletb.2019.06.047

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