From the γγ pp̄ reaction to the production of pp̄ pairs in ultraperipheral ultrarelativistic heavy-ion collisions at the LHC
In this paper we consider the production of proton-antiproton pairs in two-photon interactions in electron-positron and heavy-ion collisions. We try to understand the dependence of the total cross section on the photon-photon c.m. energy as well as corresponding angular distributions measured by the...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
29 November 2017
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| In: |
Physical review
Year: 2017, Jahrgang: 96, Heft: 9 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.96.094029 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.96.094029 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.96.094029 
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| Verfasserangaben: | Mariola Kłusek-Gawenda, Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek |
MARC
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| 245 | 1 | 0 | |a From the γγ pp̄ reaction to the production of pp̄ pairs in ultraperipheral ultrarelativistic heavy-ion collisions at the LHC |c Mariola Kłusek-Gawenda, Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek |
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| 520 | |a In this paper we consider the production of proton-antiproton pairs in two-photon interactions in electron-positron and heavy-ion collisions. We try to understand the dependence of the total cross section on the photon-photon c.m. energy as well as corresponding angular distributions measured by the Belle Collaboration for the γγ→p¯p process. To understand the Belle data we include the proton-exchange, the f2(1270) and f2(1950) s-channel exchanges, as well as the hand-bag mechanism. The helicity amplitudes for the γγ→f2→p¯p process are written explicitly based on a Lagrangian approach. The parameters of vertex form factors are adjusted to the Belle data. Having described the angular distributions for the γγ→p¯p process we present first predictions for the ultraperipheral, ultrarelativistic, heavy-ion reaction 208Pb208Pb→208Pb208Pbp¯p. Both, the total cross section and several differential distributions for experimental cuts corresponding to the ALICE, ATLAS, CMS, and LHCb experiments are presented. We find the total cross section 100 μb for the ALICE cuts, 160 μb for the ATLAS cuts, 500 μb for the CMS cuts, and 104 μb taking into account the LHCb cuts. This opens a possibility to study the γγ→p¯p process at the LHC. | ||
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