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Central exclusive diffractive production of $K^{+} K^{-} K^{+} K^{-}$ via the intermediate $\phi \phi$ state in proton-proton collisions

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arxiv 1901.11490 v2 pith:GSGOEGER submitted 2019-01-31 hep-ph hep-ex

classification hep-phhep-ex
keywords channelexperimentsmesonsrapiditystatecontributioncouplingcuts
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abstract

We present a study of the exclusive $pp \to pp K^{+} K^{-} K^{+} K^{-}$ reaction at high energies. We consider diffractive mechanisms with the intermediate $\phi \phi$ state with its decay into the $K^{+} K^{-} K^{+} K^{-}$ system. We include the $\phi(1020)$ $\hat{t}/\hat{u}$-channel exchanges and the $f_{2}(2340)$ $s$-channel exchange mechanism. This $f_{2}$ state is a candidate for a tensor glueball. We discuss the possibility to use the $pp \to pp \phi \phi$ process in identifying the odderon exchange. An upper limit for the $\mathbb{P} \mathbb{O} \phi$ coupling is extracted from the WA102 experimental data. The amplitudes for the processes are formulated within the tensor-pomeron and vector-odderon approach. We adjust parameters of our model to the WA102 data and present several predictions for the ALICE, ATLAS, CMS and LHCb experiments. Integrated cross sections of order of a few nb are obtained including the experimental cuts relevant for the LHC experiments. The distributions in the four-kaon invariant mass, rapidity distance between the two $\phi$ mesons, special ``glueball filter variable'', proton-proton relative azimuthal angle are presented. The distribution in rapidity difference of both $\phi$-mesons could shed light on the $f_{2}(2340) \to \phi \phi$ coupling, not known at present. We discuss the possible role of the $f_{0}(2100)$, $\eta(2225)$, and $X(2500)$ resonances observed in the $\phi \phi$ channel in radiative decays of $J/\psi$. Using typical kinematic cuts for LHC experiments we find from our model that the odderon-exchange contribution should be distinguishable from other contributions for large rapidity distance between the $\phi$ mesons and in the region of large four-kaon invariant masses. At least, it should be possible to derive an upper limit on the odderon contribution in this reaction.

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  1. Central exclusive production of $\eta$ and $\eta'$ mesons in diffractive proton-proton collisions at the LHC within the tensor-pomeron approach

    hep-ph 2025-06 conditional novelty 5.0 of 10

    The tensor-pomeron model predicts 0.3 to 0.7 microbarn cross sections for central eta-prime production at the LHC, and shows that scalar-pomeron models forbid eta, eta-prime, and f1 production entirely.

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