Soft-photon radiation in high-energy proton-proton collisions within the tensor-Pomeron approach: Bremsstrahlung
We discuss diffractive processes in proton-proton collisions at small momentum transfers without and with photon radiation. We consider the soft exclusive reactions pp→pp, p¯p→p¯p, and pp→ppγ within the tensor-Pomeron and vector-odderon approach. We compare our results with the data for pp and p¯p t...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
23 August 2022
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| In: |
Physical review
Year: 2022, Volume: 106, Issue: 3, Pages: 1-31 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.106.034023 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.106.034023 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.106.034023 
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| Author Notes: | Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek |
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| 520 | |a We discuss diffractive processes in proton-proton collisions at small momentum transfers without and with photon radiation. We consider the soft exclusive reactions pp→pp, p¯p→p¯p, and pp→ppγ within the tensor-Pomeron and vector-odderon approach. We compare our results with the data for pp and p¯p total cross sections, for the ratio of real to imaginary parts of the forward scattering amplitude, and for the elastic pp cross sections, especially those from TOTEM. To describe the low-energy data more accurately, the secondary reggeons must be included. We write down the amplitudes for the photon bremsstrahlung in high-energy proton-proton collisions using the tensor-Pomeron model. These results are relevant for the c.m. energies presently available at the Relativistic Heavy Ion Collider and at the LHC. We present predictions for the proposed measurements of soft photons with the planned future upgrade of the ALICE experiment at the LHC. We investigate the limits of applicability of the soft-photon approximation (SPA) based on Low’s theorem. The corresponding SPA results are compared to those obtained from our complete model. The regions of phase space are given quantitatively where SPA and our complete tensor-Pomeron results are close to each other. As an example, let k⊥, y, and ω, be the absolute value of the transverse momentum, the rapidity, and the energy of the photon, respectively, in the overall c.m. system. For the region 1 MeV<k⊥<100 MeV and 3.5<|y|<5.0, we find that the SPA Ansatz with only the pole terms ∝ω−1 agrees at the percent level with our complete model result up to ω≅2 GeV. | ||
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