Observation of Two-source Interference in the Photoproduction Reaction $Au Au \to Au Au ρ^0$
| dc.creator | Abelev, B. I. | |
| dc.date | 2008-12-05 | |
| dc.date | 2009-03-02 | |
| dc.date.accessioned | 2026-07-07T13:01:05Z | |
| dc.date.available | 2026-07-07T13:01:05Z | |
| dc.description | In ultra-peripheral relativistic heavy-ion collisions, a photon from the electromagnetic field of one nucleus can fluctuate to a quark-antiquark pair and scatter from the other nucleus, emerging as a $ρ^0$. The $ρ^0$ production occurs in two well-separated (median impact parameters of 20 and 40 fermi for the cases considered here) nuclei, so the system forms a 2-source interferometer. At low transverse momenta, the two amplitudes interfere destructively, suppressing $ρ^0$ production. Since the $ρ^0$ decay before the production amplitudes from the two sources can overlap, the two-pion system can only be described with an entangled non-local wave function, and is thus an example of the Einstein-Podolsky-Rosen paradox. We observe this suppression in 200 GeV per nucleon-pair gold-gold collisions. The interference is $87% \pm 5% {\rm (stat.)}\pm 8%$ (syst.) of the expected level. This translates into a limit on decoherence due to wave function collapse or other factors, of 23% at the 90% confidence level. | |
| dc.description | Slightly revised version, to appear in PRL. 6 pages with 4 figures | |
| dc.identifier | https://arxiv.org/abs/0812.1063 | |
| dc.identifier | http://arxiv.org/abs/0812.1063 | |
| dc.identifier | Phys.Rev.Lett.102:112301,2009 | |
| dc.identifier | doi:10.1103/PhysRevLett.102.112301 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/226045 | |
| dc.subject | Nuclear Experiment | |
| dc.subject | High Energy Physics - Experiment | |
| dc.subject | Quantum Physics | |
| dc.title | Observation of Two-source Interference in the Photoproduction Reaction $Au Au \to Au Au ρ^0$ | |
| dc.type | text |