Abstract
High-statistics \({{\pi }^{ - }}{{\pi }^{ - }}\) and \({{\pi }^{ + }}{{\pi }^{ + }}\) HBT data for non-central Au + Au collisions at 1.23 A GeV, measured with HADES at SIS18/GSI, are presented. The three-dimensional emission source is studied in dependence on pair transverse momentum and beam energy. A tilt of the source with respect to the reaction plane is observed. The spatial extension and the tilt magnitude of the source decrease with transverse momentum. A clear charge-sign difference is observed for the spatio-temporal variances, but not for the tilt angle of the source. Derived geometrical and temporal parameters do well complement the trend over several orders of magnitude in beam-energy provided that consistent transverse momenta are selected.
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REFERENCES
G. Agakishiev et al. [HADES Collab.], “The high-acceptance dielectron spectrometer HADES,” Eur. Phys. J. A 41, 243–277 (2009); arXiv:0902.3478 [nucl-ex].
M. L. Miller, K. Reygers, S. J. Sanders, and P. Steinberg, “Glauber modeling in high energy nuclear collisions,” Ann. Rev. Nucl. Part. Sci. 57, 205–243 (2007); arXiv:nucl-ex/0701025.
J. Adamczewski-Musch et al. [HADES Collab.], “Centrality determination of Au + Au collisions at 1.23A GeV with HADES,” Eur. Phys. J. A 54, 85 (2018); arXiv:1712.07993.
M. I. Podgoretsky, “On the comparison of identical pion correlations in different reference frames,” Sov. J. Nucl. Phys. 37, 272 (1983).
Yu. Sinyukov, R. Lednicky, S. V. Akkelin, J. Pluta, and B. Erazmus, “Coulomb corrections for interferometry analysis of expanding hadron systems,” Phys. Lett. B 432, 248–257 (1998).
M. A. Lisa et al. [E895 Collab.], “Azimuthal dependence of pion interferometry at the AGS,” Phys. Lett. B 496, 1–8 (2000); arXiv:nucl-ex/0007022.
U. A. Wiedemann, “Two particle interferometry for noncentral heavy ion collisions,” Phys. Rev. C 57, 266–279 (1998); arXiv:nucl-th/9707046.
U. W. Heinz, A. Hummel, M. A. Lisa, and U. A. Wiedemann, “Symmetry constraints for the emission angle dependence of HBT radii,” Phys. Rev. C 66, 044903 (2002); arXiv:nucl-th/0207003.
J. Y. Ollitrault, On the measurement of azimuthal anisotropies in nucleus-nucleus collisions (1997), arXiv: nucl-ex/9711003.
J. Adamczewski-Musch et al. [HADES Collab.], “Identical pion intensity interferometry in central Au + Au collisions at 1.23 A GeV,” Phys. Lett. B 795, 446–451 (2019); arXiv:1811.06213.
D. Adamova et al. [CERES Collab.], “Azimuthal dependence of pion source radii in Pb+Au collisions at 158-A-GeV,” Phys. Rev. C 78, 064901 (2008); arXiv: 0805.2484 [nucl-ex].
L. Adamczyk et al. [STAR Collab.], “Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector,” Phys. Rev. C 92, 014904 (2015); arXiv:1403.4972 [nucl-ex].
D. Adamova et al., [ALICE Collab.], “Azimuthally differential pion femtoscopy in Pb-Pb collisions at \(\sqrt {{{s}_{{{\text{NN}}}}}} \) = 2.76 TeV,” Phys. Rev. Lett. 118, 222301 (2017); arXiv:1702.01612.
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Greifenhagen, R., for the HADES collaboration. Two-Pion Intensity-Interferometry in Non-Central Collisions of Au + Au @ 1.23 A GeV. Phys. Part. Nuclei 51, 288–292 (2020). https://doi.org/10.1134/S1063779620030132
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DOI: https://doi.org/10.1134/S1063779620030132