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Central production of lepton–antilepton pairs and heavy quark composite states in hadron diffractive collisions at ultrahigh energies

V. V. Anisovich

National Research Centre "Kurchatov Institute", Petersburg Nuclear Physics Institute, Gatchina 188300, Russia

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M. A. Matveev

National Research Centre "Kurchatov Institute", Petersburg Nuclear Physics Institute, Gatchina 188300, Russia

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V. A. Nikonov

National Research Centre "Kurchatov Institute", Petersburg Nuclear Physics Institute, Gatchina 188300, Russia

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, and

J. Nyiri

Institute for Particle and Nuclear Physics, Wigner RCP, Budapest 1121, Hungary

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https://doi.org/10.1142/S0217751X14501760Cited by:5 (Source: Crossref)

Abstract

Central production of lepton–antilepton pairs (e⁺e^- and μ⁺μ^-) and heavy quark composite states (charmonia and bottomonia) in diffractive proton collisions (proton momenta transferred |q_⊥| ~ m/ln s) are studied at ultrahigh energies (ln s ≫ 1), where σ_tot(pp^±) ~ ln^N s with 1 ≲ N ≲ 2. The pp^±-rescattering corrections, which are not small, are calculated in terms of the K-matrix approach modified for ultrahigh energies. Two versions of hadron interactions are considered in detail: the growth (i) σ_tot(pp^±) ~ ln² s, σ_inel(pp^±) ~ ln² s within the black disk mode and (ii) σ_tot(pp^±) ~ ln² s, σ_inel(pp^±) ~ ln s within the resonant disk mode. The energy behavior of the diffractive production processes differs strongly for these modes, thus giving a possibility to distinguish between the versions of the ultrahigh energy interactions.

Keywords:

PACS: 13.85.Lg, 13.75.Cs, 14.20.Dh

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