Azimuthal Dependence of Pion Interferometry at the AGS

E895 Collaboration: M. A. Lisa , N. N. Ajitanand , J. M. Alexander , M. Anderson , D. Best , F. P. Brady , T. Case , W. Caskey

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D. Cebra J. L. Chance P. Chung B. Cole K. Crowe A. C. Das J. E. Draper M. L. Gilkes S. Gushue M. Heffner A. S. Hirsch E. L. Hjort L. Huo M. Justice M. Kaplan D. Keane J. C. Kintner J. Klay D. Krofcheck R. A. Lacey J. Lauret H. Liu Y. M. Liu R. McGrath Z. Milosevich G. Odyniec D. L. Olson S. Y. Panitkin C. Pinkenburg N. T. Porile G. Rai H. G. Ritter J. L. Romero R. Scharenberg L. Schroeder B. Srivastava N. T. B. Stone T. J. M. Symons R. Wells J. Whitfield T. Wienold R. Witt L. Wood W. N. Zhang

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keywords planeazimuthalcollisionsextensioninformationpionreactionsource

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Two-pion correlation functions, measured as a function of azimuthal emission angle with respect to the reaction plane, provide novel information on the anisotropic shape and orientation of the pion-emitting zone formed in heavy ion collisions. We present the first experimental determination of this information, for semi-central Au+Au collisions at 2-6 AGeV. The source extension perpendicular to the reaction plane is greater than the extension in the plane, and tilt of the pion source in coordinate space is found to be opposite its tilt in momentum space.

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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.