Tomography of ultrarelativistic nuclei with polarized photon-gluon collisions
- 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:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- Bundesministerium für Bildung und Forschung (BMBF); Chinese Academy of Sciences (CAS); Croatian Ministry of Science, Education and Sports; Czech Science Foundation (GA CR); Government of India, Department of Science and Technology; Hungarian Academy of Sciences; Ministry of Education and Science of the Russian Federation; Ministry of Education of the People's Republic of China; National Natural Science Foundation of China (NSFC); National Research Foundation (NRF) of Korea; National Science Centre (Poland) (NSC); Rosatom State Atomic Energy Corporation; USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- STAR Collaboration
- Grant/Contract Number:
- AC02-06CH11357; SC0012704
- OSTI ID:
- 1908371
- Alternate ID(s):
- OSTI ID: 1990044
- Report Number(s):
- BNL-223867-2023-JAAM
- Journal Information:
- Science Advances, Journal Name: Science Advances Journal Issue: 1 Vol. 9; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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· Physical Review, D (Particles Fields); (United States)
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OSTI ID:6967088