Exclusive and semiexclusive production of ${\mu }^{+}{\mu }^{-}$ pairs with $\Delta$ isobars and other resonances in the final state and the size of absorption effects

Abstract

We include $pp\to p{\Delta }^{+}{\mu }^{+}{\mu }^{-}$ and $pp\to {\Delta }^{+}{\Delta }^{+}{\mu }^{+}{\mu }^{-}$ processes in addition to the standard $pp\to pp{\mu }^{+}{\mu }^{-}$ process both in equivalent-photon approximation (EPA) and in exact $2\to 4$ calculations. For comparison we calculate also the continuum proton dissociation in a recently developed $k_t$-factorization approach to $\gamma \gamma$-involved processes with parametrizations of $F_2$ structure function known from the literature. The calculated cross section including all the processes is considerably larger than the one measured recently by the ATLAS collaboration. We calculate absorption effects for $pp\to pp{\mu }^{+}{\mu }^{-}$ process in the momentum space. The final cross section with absorption effects is by 10\% larger than the one measured by the ATLAS collaboration which is difficult to explain. Several differential distributions with the ATLAS experimental cuts are presented. It is shown that the processes with electromagnetic $p\to \Delta (1232)$ and $p\to N(1440)$ transitions, that have similar characteristics as the $pp\to pp{\mu }^{+}{\mu }^{-}$ process, increase the cross section for ${\mu }^{+}{\mu }^{-}$ production and thus can affect its theoretical interpretation when the leading baryons are not detected as is the case for the CMS and ATLAS measurements. The mechanism of dissociation into hadronic continuum is not under full control as the corresponding absorption effects are not fully understood. We present first predictions for future ATLAS experiment with the ALFA sub-detectors and discuss observables relevant for this measurement.

20 pages, 8 figures, v2 reflects that accepted for publication in PRD

References in corpus (13)

• Exclusive photoproduction of $J/\psi$ in proton-proton and proton-antiproton scattering
• Measurement of the exclusive $\gamma \gamma \to {\mu }^{+}{\mu }^{-}$ process in proton--proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• D-state effects in the electromagnetic N-Delta transition
• Empirical transverse charge densities in the nucleon-to-P11(1440) transition
• Electromagnetic structure of nucleon and Roper in soft-wall AdS/QCD
• Towards a complete study of central exclusive production of $K^{+}{K}^{-}$ pairs in proton-proton collisions within the tensor Pomeron approach
• Multiple interactions and rapidity gap survival
• ${\gamma }^{\ast }N\to N(1710)$ transition at high momentum transfer
• Central exclusive diffractive production of $p\bar{p}$ pairs in proton-proton collisions at high energies
• Analytic parametrizations of the ${\gamma }^{\ast }N\to N(1440)$ form factors inspired by Light-Front holography
• Exclusive production of heavy charged Higgs boson pairs in the $pp\to pp{H}^{+}{H}^{-}$ reaction at the LHC and a future circular collider
• Constraining the photon flux in two-photon processes at the LHC
• Exclusive and diffractive ${\mu }^{+}{\mu }^{-}$ production in $pp$ collisions at the LHC

Cited by in corpus (3)

• Searching for the odderon in $pp\to pp{K}^{+}{K}^{-}$ and $pp\to pp{\mu }^{+}{\mu }^{-}$ reactions in the $\varphi (1020)$ resonance region at the LHC
• Non-exclusive particle production by $\gamma \gamma$ interactions in $pp$ collisions at the LHC
• Semiexclusive dilepton production in proton-proton collisions with one forward proton measurement at the LHC