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On the use of a running coupling in the calculation of forward hadron production at next-to-leading order

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arxiv 1807.04971 v1 pith:3VSWFAZS submitted 2018-07-13 hep-ph

On the use of a running coupling in the calculation of forward hadron production at next-to-leading order

classification hep-ph
keywords prescriptionspacecoordinatecalculationcouplingforwardmomentumnext-to-leading
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study a puzzle raised recently regarding the running coupling prescription used in the calculation of forward particle production in proton-nucleus collisions at next-to-leading order: using a coordinate space prescription which is consistent with the one used in the high energy evolution of the target leads to results which can be two orders of magnitude larger than the ones obtained with a momentum space prescription. We show that this is an artefact of the Fourier transform involved when passing between coordinate and momentum space and propose a new coordinate space prescription which avoids this problem.

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