Observation of Two-Source Interference in the Photoproduction Reaction AuAu -> AuAu rho(0)
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2009
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Resumo |
In ultraperipheral 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 F for the cases considered here) nuclei, so the system forms a two-source interferometer. At low transverse momenta, the two amplitudes interfere destructively, suppressing rho(0) production. Since the rho(0) decays before the production amplitudes from the two sources can overlap, the two-pion system can only be described with an entangled nonlocal 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%+/- 5%(stat.)+/- 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. U. S. DOE Office of Science U. S. NSF National Science Foundation Sloan Foundation Deutsche Forschungsgemeinschaft - DFG Excellence Cluster EXC153 of Germany Centre National de la Recherche Scientifique - CNRS/IN2P3 RA RPL EMN of France STFC EPSRC FAPESP of Brazil MES Russian Ministry of Science and Technology National Natural Science Foundation of China (NNSFC) CAS of China MoST of China MoE of China IRP GACR of the Czech Republic FOM of The Netherlands (DAE) Department of Atomic Energy, India (DST) Department of Science and Technology, India (CSIR) Council of Scientific and Industrial Research - India Swiss NSF Polish State Committee for Scientific Research Korea Science and Engineering Foundation (KOSEF) |
Identificador |
PHYSICAL REVIEW LETTERS, v.102, n.11, 2009 0031-9007 http://producao.usp.br/handle/BDPI/16327 10.1103/PhysRevLett.102.112301 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review Letters |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #HEAVY-ION COLLISIONS #TIME PROJECTION CHAMBER #COLLIDERS #PHYSICS #PHOTON #Physics, Multidisciplinary |
Tipo |
article original article publishedVersion |