{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.98964.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/804391"}},{"@id":"https://doi.org/10.1103/PhysRevLett.102.112301","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"STAR Collaboration"},"creator":{"@type":"Organization","name":"STAR Collaboration"},"datePublished":"2021","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 $\\rho^0$. The $\\rho^0$ 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 $\\rho^0$ production. Since the $\\rho^0$ 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(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.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.98964.v1/t1","@type":"Dataset","description":"Rapidity (left) and $M_{\\pi\\pi}$ (right) of the $\\pi^{+}\\pi^{-}$ distributions for the topology (exclusive $\\rho^0$, top) and MB (Coulomb breakup, bottom)...","name":"Figure 1 right bottom"},{"@id":"https://doi.org/10.17182/hepdata.98964.v1/t2","@type":"Dataset","description":"Rapidity (left) and $M_{\\pi\\pi}$ (right) of the $\\pi^{+}\\pi^{-}$ distributions for the topology (exclusive $\\rho^0$, top) and MB (Coulomb breakup, bottom)...","name":"Figure 1 right top"},{"@id":"https://doi.org/10.17182/hepdata.98964.v1/t3","@type":"Dataset","description":"Raw (uncorrected) \u03c10 $t_{\\perp}$-spectrum in the range 0.0 < |y| < 0.5 for the MB data. The points are data,...","name":"Figure 2"},{"@id":"https://doi.org/10.17182/hepdata.98964.v1/t4","@type":"Dataset","description":"Efficiency corrected $t_{\\perp}$ spectrum for $\\rho^{0}$ from (top) minium bias and (bottom) topology data, for mid-rapidity (left) and larger rapidity...","name":"Figure 3 left top"},{"@id":"https://doi.org/10.17182/hepdata.98964.v1/t5","@type":"Dataset","description":"Efficiency corrected $t_{\\perp}$ spectrum for $\\rho^{0}$ from (top) minium bias and (bottom) topology data, for mid-rapidity (left) and larger rapidity...","name":"Figure 3 right top"},{"@id":"https://doi.org/10.17182/hepdata.98964.v1/t6","@type":"Dataset","description":"Efficiency corrected $t_{\\perp}$ spectrum for $\\rho^{0}$ from (top) minium bias and (bottom) topology data, for mid-rapidity (left) and larger rapidity...","name":"Figure 3 left bottom"},{"@id":"https://doi.org/10.17182/hepdata.98964.v1/t7","@type":"Dataset","description":"Efficiency corrected $t_{\\perp}$ spectrum for $\\rho^{0}$ from (top) minium bias and (bottom) topology data, for mid-rapidity (left) and larger rapidity...","name":"Figure 3 right bottom"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins804391?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/98964"}],"inLanguage":"en","name":"Observation of Two-source Interference in the Photoproduction Reaction $Au Au \\to Au Au \\rho^0$","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins804391?version=1","version":1}