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

Anisovich, V. V. and Matveev, M. A. and Nikonov, V. A. and Nyiri, Júlia (2014) Central production of lepton–antilepton pairs and heavy quark composite states in hadron diffractive collisions at ultrahigh energies. INTERNATIONAL JOURNAL OF MODERN PHYSICS A, 29. ISSN 0217-751X

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Abstract

Central production of lepton-lepton pairs (e+e− and μ+μ−) and heavy quark com- posite states (charmonia and bottomonia) in diffractive proton collisions (proton mo- menta transferred |q⊥| ∼ m/ ln s) are studied at ultrahigh energies (ln s >> 1), where σtot(pp±) ∼ lnN 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) σtot(pp±) ∼ ln2 s, σinel(pp±) ∼ ln2 s within the black disk mode and (ii) σtot(pp±) ∼ ln2 s, σinel(pp±) ∼ ln s within the resonant disk mode. The energy behavior of the diffractive production pro- cesses differs strongly for these modes, thus giving a possibility to distinguish between the versions of the ultrahigh energy interactions.

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