The ${\rho }^0$ and Drell-Söding contributions to central exclusive production of ${\pi }^{+}{\pi }^{-}$ pairs in proton-proton collisions at high energies

Abstract

We present a study of the central exclusive ${\pi }^{+}{\pi }^{-}$ production via the photoproduction mechanism in nucleon-nucleon collisions. The photon-pomeron/reggeon and pomeron/reggeon-photon exchanges both for the ${\rho }^0$ resonance contribution and the Drell-Söding contribution are considered. The amplitudes for the processes are formulated in terms of vertices respecting the standard crossing and charge-conjugation relations of Quantum Field Theory. The coupling parameters of tensor pomeron and reggeon exchanges are fixed based on the H1 and ZEUS experimental data for the $\gamma p\to {\rho }^{0}p$ reaction. We present first predictions of this mechanism for the $pp\to pp{\pi }^{+}{\pi }^{-}$ reaction being studied at COMPASS, RHIC, Tevatron, and LHC. We show the influence of the experimental cuts on the integrated cross section and on various differential distributions for outgoing particles. Distributions in rapidities and transverse momenta of outgoing protons and pions as well as correlations in azimuthal angle between them are presented. We compare the photoproduction contribution to ${\pi }^{+}{\pi }^{-}$ distributions with double pomeron/reggeon two-pion continuum. We discuss whether the high-energy central production of ${\rho }^0$ mesons could be selected experimentally.

24 pages, 14 figures and 1 table

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Cited by in corpus (14)

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• Photoproduction of pi+ pi- pairs in a model with tensor-pomeron and vector-odderon exchange
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• From the $\gamma \gamma \to p\bar{p}$ reaction to the production of $p\bar{p}$ pairs in ultraperipheral ultrarelativistic heavy-ion collisions at the LHC
• Central production of ${\rho }^0$ in $pp$ collisions with single proton diffractive dissociation at the LHC
• High-energy $\pi \pi$ scattering without and with photon radiation
• Central exclusive diffractive production of a single photon in high-energy proton-proton collisions within the tensor-Pomeron approach
• Study of the exclusive reaction $pp\to pp{K}^{\ast 0}{\bar{K}}^{\ast 0}$: $f_2(1950)$ resonance versus diffractive continuum
• Measurement of exclusive pion pair production in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Deeply virtual Compton scattering in the tensor-pomeron approach
• Central exclusive diffractive production of two-pions from continuum and decays of resonances in the Regge-eikonal model
• Central exclusive diffractive $p$ $\bar{p}$ production in the Regge-eikonal model in the "scalar'' proton approximation
• GenEx - Exclusive Meson Generator
• Diffractive Physics at the LHC