Electron-positron pair production in Coulomb collisions of ultrarelativistic sulfur ions with fixed targets

Vane, C. R.; Datz, S.; Dittner, P.F.; Krause, H.; Böttcher, C.; Strayer, M. R.; Schuch, R.; Gao, Hui; Hutton, R.

doi:10.1103/physrevlett.69.1911

Cited by 57 publications

(47 citation statements)

References 14 publications

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“…[32] shows satisfactory agreement of the positron spectra up to --8 MeV/c with the calculations of Ref. [14], but an experimental deficit above this momentum.…”

Section: Resultssupporting

confidence: 73%

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Direct production of electron-positron pairs by 200-GeV/nucleon oxygen and sulfur ions in nuclear emulsion

et al. 1995

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Measurementsof direct Coulomb electron-positron pair production have been made on the tracks of relativistic heavy ions in nuclear track emulsion. Tracks of 016 and S32 at 200 GeV/nucleon were studied. The measured total cross sections and energy and emission angle distributions for the pair members are compared to theoretical predictions.The data are consistent with some recent calculations when knock-on electron contamination is accounted for. PACS number(s): 34.90.+q, 12.20.Fv, 25.75.+r, 29.40.Rg

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“…[32] shows satisfactory agreement of the positron spectra up to --8 MeV/c with the calculations of Ref. [14], but an experimental deficit above this momentum.…”

Section: Resultssupporting

confidence: 73%

“…[32] is prevented by our measurement errors which tend to fiatten the spectra, and also our poor statistics.…”

Section: Resultsmentioning

confidence: 99%

Direct production of electron-positron pairs by 200-GeV/nucleon oxygen and sulfur ions in nuclear emulsion

et al. 1995

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“…A study of e + e − production in sulfur-induced fixed-target heavy-ion collisions at √ s NN = 20 GeV found that the positrons had a higher average energy than the electrons [254]. This difference may be explained by Coulomb corrections [255] since electrons are attracted to nuclei while positrons are repelled.…”

Section: E + E − Productionmentioning

confidence: 93%

“…Although the bound-free pair production cross section is smaller than the total lepton-pair cross section, it has a number of important implications for the LHC. Pair production has been studied at RHIC [121] and the Fermilab Tevatron [252], in addition to fixed-target experiments [253][254][255].…”

Section: Pure Qed Processesmentioning

confidence: 99%

The physics of ultraperipheral collisions at the LHC

et al. 2008

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229 Pages, 121 figuresWe discuss the physics of large impact parameter interactions at the LHC: ultraperipheral collisions (UPCs). The dominant processes in UPCs are photon-nucleon (nucleus) interactions. The current LHC detector configurations can explore small $x$ hard phenomena with nuclei and nucleons at photon-nucleon center-of-mass energies above 1 TeV, extending the $x$ range of HERA by a factor of ten. In particular, it will be possible to probe diffractive and inclusive parton densities in nuclei using several processes. The interaction of small dipoles with protons and nuclei can be investigated in elastic and quasi-elastic $J/\psi$ and $\Upsilon$ production as well as in high $t$ $\rho^0$ production accompanied by a rapidity gap. Several of these phenomena provide clean signatures of the onset of the new high gluon density QCD regime. The LHC is in the kinematic range where nonlinear effects are several times larger than at HERA. Two-photon processes in UPCs are also studied. In addition, while UPCs play a role in limiting the maximum beam luminosity, they can also be used a luminosity monitor by measuring mutual electromagnetic dissociation of the beam nuclei. We also review similar studies at HERA and RHIC as well as describe the potential use of the LHC detectors for UPC measurements

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“…In view of the experimental result of [38,39,40] which observed an almost exact Z 2 scaling of the positron yield (or, equivalently, the number of produced pairs) apparently incompatible with large Coulomb corrections, one should mention a possible shortcoming of such a model. As explained in reference [12], the Coulomb corrections in the integral Eq.…”

Section: Papers [4 11]mentioning

confidence: 99%

Coulomb corrections to e+e− production in ultra-relativistic nuclear collisions

et al. 2001

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The purpose of this paper is to explain the discrepancies existing in the literature relative to e + e − pair production in peripheral heavy ion collisions at ultra-relativistic energies. A controversial issue is the possible cancellation of Coulomb corrections to the Born term in the pair production cross-section. Such a cancellation has been observed in a recent approach based on finding retarded solutions of the Dirac equation, but does not seem to hold in a perturbative approach. We show in this paper that the two approaches are in fact calculating different observables: the perturbative approach gives the exclusive cross-section of single pair production, while the other method gives the inclusive cross-section.We have also performed a thorough study of the electron propagator in the non-static background field of the two nuclei, the conclusion of which is that the retarded propagator is in the ultra-relativistic limit a much simpler object than the Feynman propagator, and can be calculated exactly.

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Electron-positron pair production in Coulomb collisions of ultrarelativistic sulfur ions with fixed targets

Cited by 57 publications

References 14 publications

Direct production of electron-positron pairs by 200-GeV/nucleon oxygen and sulfur ions in nuclear emulsion

Direct production of electron-positron pairs by 200-GeV/nucleon oxygen and sulfur ions in nuclear emulsion

The physics of ultraperipheral collisions at the LHC

Coulomb corrections to e+e− production in ultra-relativistic nuclear collisions

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