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The extraction of the bare triple-Pomeron vertex; a crucial ingredient for diffraction

V. A. Khoze·A. D. Martin·M. G. Ryskin
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Abstract

The triple-Pomeron coupling lies at the heart of the predictions for high energy diffractive processes. We explain why the existing determinations, which use single-particle inclusive hadronic data a+b -> a+Y, underestimate the value of the bare coupling, due to the neglect of soft rescattering which populates the rapidity gaps. We describe how data for the process gamma+p -> J/psi +Y can be used to give a much more reliable estimate of the bare coupling. We use the existing, fragmentary, J/psi data from HERA to show that the triple-Pomeron coupling is probably about 3 times larger than the previous determinations. We emphasize the importance of an explicit measurement of the mass spectrum of the Y system which accompanies J/psi production at HERA. The consequences for ultra high energy cosmic ray showers are mentioned.

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V. A. Khoze, A. D. Martin, M. G. Ryskin. 2006-09-29. The extraction of the bare triple-Pomeron vertex; a crucial ingredient for diffraction. https://doi.org/10.1016/j.physletb.2006.10.031

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