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arxiv: 1910.07885 · v2 · pith:AXWFGTXRnew · submitted 2019-10-16 · ⚛️ nucl-ex

Identical pion intensity interferometry at sqrt(s_(NN))=2.4 GeV

J. Adamczewski-Musch , O. Arnold , C. Behnke , A. Belounnas , A. Belyaev , J.C. Berger-Chen , J. Biernat , A. Blanco
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C. Blume M. B\"ohmer 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. Fr\"ohlich T. Galatyuk J.A. Garz\'on R. Gernh\"auser M. Golubeva R. Greifenhagen F. Guber M. Gumberidze S. Harabasz T. Heinz T. Hennino S. Hlavac C. H\"ohne R. Holzmann A. Ierusalimov A. Ivashkin B. K\"ampfer T. Karavicheva B. Kardan I. Koenig W. Koenig B.W. Kolb G. Korcyl G. Kornakov F. Kornas R. Kotte 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. M\"untz R. M\"unzer L. Naumann K. 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 I. Selyuzhenkov J. Siebenson L. Silva Yu.G. Sobolev S. Spataro S. Spies H. Str\"obele J. Stroth P. Strzempek C. Sturm O. Svoboda M. Szala P. Tlusty M. Traxler H. Tsertos E. Usenko V. Wagner C. Wendisch M.G. Wiebusch J. Wirth D. W\'ojcik Y. Zanevsky P. Zumbruch
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keywords transverseemissionmomentumplanesourcecentralityeccentricityreaction
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High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ femtoscopy data are presented for Au+Au collisions at $\sqrt{s_\mathrm{NN}}=2.4$ GeV, measured with HADES at SIS18/GSI. The experimental correlation functions allow the determination of the space-time extent of the corresponding emission sources via a comparison to models. The emission source, parametrized as three-dimensional Gaussian distribution, is studied in dependence on pair transverse momentum, azimuthal emission angle with respect to the reaction plane, collision centrality and beam energy. For all centralities and transverse momenta, a geometrical distribution of ellipsoidal shape is found in the plane perpendicular to the beam direction with the larger extension perpendicular to the reaction plane. For large transverse momenta, the corresponding eccentricity approaches the initial eccentricity. The eccentricity is smallest for most central collisions, where the shape is almost circular. The magnitude of the tilt angle of the emission ellipsoid in the reaction plane decreases with increasing centrality and increasing transverse momentum. All source radii increase with centrality, largely exhibiting a linear rise with the number of participants, irrespective of transverse momentum. A substantial charge-sign difference of the source radii is found, appearing most pronounced at low transverse momentum. The extracted source parameters are consistent with the extrapolation of their energy dependence down from higher energies.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Tilted geometry of the pion emission source in Au+Au collisions in the RHIC Beam Energy Scan

    nucl-ex 2026-05 unverdicted novelty 7.0

    The pion emission source in Au+Au collisions is tilted with magnitude decreasing rapidly as collision energy rises from 7.7 to 27 GeV, indicating departure from longitudinal boost invariance.

  2. When positive and negative pairs differ in femtoscopy: residual Coulomb and isospin effects

    nucl-th 2026-06 unverdicted novelty 5.0

    Residual Coulomb and isospin effects produce charge-dependent splittings in identical-particle correlation functions, strongest at low kT, that modify fitted radii.