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Title: Tomography of ultrarelativistic nuclei with polarized photon-gluon collisions

Journal Article · · Science Advances
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)

A linearly polarized photon can be quantized from the Lorentz-boosted electromagnetic field of a nucleus traveling at ultrarelativistic speed. When two relativistic heavy nuclei pass one another at a distance of a few nuclear radii, the photon from one nucleus may interact through a virtual quark-antiquark pair with gluons from the other nucleus, forming a short-lived vector meson (e.g., ρ0). In this experiment, the polarization was used in diffractive photoproduction to observe a unique spin interference pattern in the angular distribution of ρ0 → π+π decays. The observed interference is a result of an overlap of two wave functions at a distance an order of magnitude larger than the ρ0 travel distance within its lifetime. The strong-interaction nuclear radii were extracted from these diffractive interactions and found to be 6.53 ± 0.06 fm (197Au) and 7.29 ± 0.08 fm (238U), larger than the nuclear charge radii. The observable is demonstrated to be sensitive to the nuclear geometry and quantum interference of nonidentical particles.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); Bundesministerium für Bildung und Forschung (BMBF); Hungarian Academy of Sciences; National Natural Science Foundation of China (NSFC); Ministry of Education of the People's Republic of China; Czech Science Foundation (GA CR); Government of India, Department of Science and Technology; National Science Centre (Poland) (NSC); Croatian Ministry of Science, Education and Sports; Rosatom State Atomic Energy Corporation; Chinese Academy of Sciences (CAS); Ministry of Education and Science of the Russian Federation; National Research Foundation of Korea (NRF)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; AC02-06CH11357
OSTI ID:
1908371
Alternate ID(s):
OSTI ID: 1990044
Report Number(s):
BNL-223867-2023-JAAM
Journal Information:
Science Advances, Vol. 9, Issue 1; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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