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Durham University

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Publication details for Alan Martin

Harland-Lang, L. A., Khoze, V. A., Martin, A. D. & Ryskin, M. G. (2019). Searching for the odderon in ultraperipheral proton-ion collisions at the LHC. Physical Review D 99(3): 034011.

Author(s) from Durham


We explore the possibility of observing odderon exchange in proton-ion collisions at the LHC, via the
ultraperipheral photoproduction of C-even mesons. As well as the signal, we consider in detail the principle
backgrounds, due to QCD-initiated production (i.e., double pomeron exchange) and γγ fusion.We find that
while the photon-initiated background is dominant at very small momentum transfer, this can be effectively
removed by placing a reasonable cut on the transverse momentum of the produced meson. In the case
of QCD-initiated production, we show this is in general strongly suppressed by the small probability of
no additional particle production in the central detector, namely the survival factor. In some scenarios,
this suppression is sufficient to permit the observation of odderon exchange in Pb − p collisions in a clean
environment, or else to place bounds on this. We in addition identify the cases of π0 and ηð548Þ production
as particularly promising channels. Here, the QCD-initiated background is absent for π0 due to isospin
conservation and very small for ηð548Þ due to its dominantly flavor octet nature and odd parity.