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Production of e(+)e(-) pairs accompanied by nuclear dissociation in ultraperipheral heavy-ion collisions
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SYSNO ASEP 0105646 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Production of e(+)e(-) pairs accompanied by nuclear dissociation in ultraperipheral heavy-ion collisions Title Produkce e+e- párů sdružená s jadernou disociací v ultraperiferálních srážkách těžkých iontů Author(s) Adams, J. (GB)
Aggarwal, M. M. (IN)
Ahammed, Z. (IN)
Amonett, J. (DE)
Šumbera, Michal (UJF-V) RID, ORCID, SAISource Title Physical Review. C - ISSN 0556-2813
Roč. 70, č. 3 (2004), s. 031902Number of pages 1 s. Language eng - English Country US - United States Keywords time projection chamber ; gamma-gamma ; colliders Subject RIV BF - Elementary Particles and High Energy Physics R&D Projects KSK1048102 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) Annotation We present data on e(+)e(-) pair production accompanied by nuclear breakup in ultraperipheral gold-gold collisions at a center of mass energy of 200 GeV per nucleon pair. The nuclear breakup requirement selects events at small impact parameters, where higher-order diagrams for pair production should be enhanced. We compare the data with two calculations: one based on the equivalent photon approximation, and the other using lowest-order quantum electrodynamics (QED). The data distributions agree with both calculations, except that the pair transverse momentum spectrum disagrees with the equivalent photon approach. We set limits on higher-order contributions to the cross section Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2005
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