Production of e+e-pairs accompanied by nuclear dissociation in ultraperipheral heavy-ion collisions

STAR Collaboration

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number031902
Pages (from-to)319021-319026
Number of pages6
JournalPhysical Review C - Nuclear Physics
Volume70
Issue number3
DOIs
StatePublished - Sep 1 2004

Fingerprint

pair production
ionic collisions
dissociation
gold
photons
quantum electrodynamics
transverse momentum
center of mass
diagrams
requirements
collisions
cross sections
approximation
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Production of e+e-pairs accompanied by nuclear dissociation in ultraperipheral heavy-ion collisions. / STAR Collaboration.

In: Physical Review C - Nuclear Physics, Vol. 70, No. 3, 031902, 01.09.2004, p. 319021-319026.

Research output: Contribution to journalArticle

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abstract = "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.",
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AU - STAR Collaboration

AU - Adams, J.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Amonett, J.

AU - Anderson, B. D.

AU - Arkhipkin, D.

AU - Averichev, G. S.

AU - Bai, Y.

AU - Balewski, J.

AU - Barannikova, O.

AU - Barnby, L. S.

AU - Baudot, J.

AU - Bekele, S.

AU - Belaga, V. V.

AU - Bellwied, R.

AU - Berger, J.

AU - Bezverkhny, B. I.

AU - Bharadwaj, S.

AU - Bhatia, V. S.

AU - Bichsel, H.

AU - Billmeier, A.

AU - Bland, L. C.

AU - Blyth, C. O.

AU - Bonner, B. E.

AU - Botje, M.

AU - Boucham, A.

AU - Brandin, A.

AU - Bravar, A.

AU - Bystersky, M.

AU - Cadman, R. V.

AU - Cai, X. Z.

AU - Caines, H.

AU - Calderón De La Barca Sánchez, M.

AU - Carroll, J.

AU - Castillo, J.

AU - Cebra, D.

AU - Chajecki, Z.

AU - Chaloupka, P.

AU - Chattopdhyay, S.

AU - Chen, H. F.

AU - Chen, Y.

AU - Cheng, J.

AU - Cherney, Michael G.

AU - Chikanian, A.

AU - Christie, W.

AU - Coffin, J. P.

AU - Cormier, T. M.

AU - Cramer, J. G.

AU - Crawford, H. J.

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N2 - 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.

AB - 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.

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