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Isolating the Odderon in central production in high energy pA and AA collisions

McNulty, R.; Khoze, V.A.; Martin, A.D.; Ryskin, M.G.

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R. McNulty

V.A. Khoze

A.D. Martin

M.G. Ryskin


We study the rapidity dependence of the central exclusive production cross sections of C-even mesons in pA and AA collisions, where A is a heavy ion. We observe qualitatively different behaviour of the contributions arising from γ-Odderon and Pomeron–Pomeron fusion mechanisms. This can be used to extract the Odderon signal from the events of f2 mesons exclusively produced in the forward region. Estimates, obtained using expected values of the Odderon cross section, indicate that the γ-Odderon contribution may exceed by a few times the Pomeron-induced background in Pb–Pb collisions. Moreover, the Odderon effect can be clearly seen in terms of the asymmetry in pA and AA collisions with the beam and target reversed. It is particularly interesting to note that the asymmetry for γ-Odderon fusion reaches its maximum value close to 1 in the forward direction, whereas the asymmetry for the Pomeron–Pomeron fusion contribution is small. The role of additional interactions of the f2 meson with nucleons in the heavy ion, and also the contributions from secondary Reggeons, are estimated. The photon–Odderon contribution has a large normalisation uncertainty but the enhanced cross-section in the forward region combined with a large asymmetry increases the chance of experimentally detecting the Odderon.


McNulty, R., Khoze, V., Martin, A., & Ryskin, M. (2020). Isolating the Odderon in central production in high energy pA and AA collisions. The European Physical Journal C, 80(3), Article 80.

Journal Article Type Article
Acceptance Date Mar 12, 2020
Online Publication Date Mar 30, 2020
Publication Date 2020
Deposit Date Apr 15, 2020
Publicly Available Date Apr 15, 2020
Journal European Physical Journal C: Particles and Fields
Print ISSN 1434-6044
Electronic ISSN 1434-6052
Publisher SpringerOpen
Peer Reviewed Peer Reviewed
Volume 80
Issue 3
Article Number 80


Published Journal Article (654 Kb)

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