Central exclusive production of η and η0 mesons in diffractive proton-proton collisions at the LHC within the tensor-pomeron approach
We present a study of the central exclusive production (CEP) of 𝜂 and 𝜂′(958) mesons in diffractive proton-proton collisions at high energies. The amplitudes, including pomeron and 𝑓2ℝ reggeon exchanges, are calculated within the tensor-pomeron model. Absorption effects are also taken into account...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
29 August, 2025
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| In: |
Physical review
Year: 2025, Volume: 112, Issue: 3, Pages: 1-15 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/9scn-925d |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1103/9scn-925d Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/9scn-925d 
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| Author Notes: | Piotr Lebiedowicz, Otto Nachtmann, and Antoni Szczurek |
| Summary: | We present a study of the central exclusive production (CEP) of 𝜂 and 𝜂′(958) mesons in diffractive proton-proton collisions at high energies. The amplitudes, including pomeron and 𝑓2ℝ reggeon exchanges, are calculated within the tensor-pomeron model. Absorption effects are also taken into account at the amplitude level. We fit some undetermined model parameters (coupling constants and cutoff parameters in form factors) to the WA102 experimental data and then make predictions for the LHC energy √𝑠=13 TeV. Both total cross sections and several differential distributions are presented. For 𝑝𝑝 →𝑝𝑝𝜂, we find an upper limit for the total cross section of 2.5 μb for pseudorapidity of the 𝜂 meson |𝜂𝑀|<1 and 5.6 μb for 2<𝜂𝑀<5. For 𝑝𝑝 →𝑝𝑝𝜂′, we predict the cross section to be in the range of 0.3-0.7 μb for pseudorapidity of the 𝜂′ meson |𝜂𝑀| <1 and 0.9-2.1 μb for 2 <𝜂𝑀 <5. This opens the possibility to study diffractive production of pseudoscalar mesons in experiments at the LHC. We discuss if there are arguments from SU(3)-flavor symmetry which would forbid pomeron-pomeron fusion giving an 𝜂 meson. In our opinion such arguments do not exist. We also consider CEP of the pseudoscalars 𝜂 and 𝜂′(958) and the pseudovector meson 𝑓1(1285) in diffractive proton-proton collisions in a theory with a scalar pomeron. We show that none of these particles can be produced in this way in the scalar-pomeron theory. Thus, experimental observation of any of these particles in the above CEP processes at the LHC would give striking evidence against a scalar character of the pomeron. |
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| Item Description: | Gesehen am 27.01.2026 |
| Physical Description: | Online Resource |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/9scn-925d |