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

Journal Article · 22 January 2019 · Nuclear Physics. A

DOI: https://doi.org/10.1016/j.nuclphysa.2018.10.062 · OSTI ID:1610194

Ducloué, B. ^[1]; Iancu, E. ^[2]; Lappi, T.  ^[3]; Mueller, A. H. ^[4]; Soyez, G.  ^[2]; Triantafyllopoulos, D. N. ^[5]; Zhu, Y. ^[6]

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1. Univ. Paris-Saclay, Gif-sur-Yvette (France); DOE/OSTI
2. Univ. Paris-Saclay, Gif-sur-Yvette (France)
3. Univ. of Helsinki (Finland)
4. Columbia Univ., New York, NY (United States)
5. European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*), Villizzano (Italy)
6. Technische Univ. Munchen, Garching (Germany)

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 consis-tent 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 trans-form involved when passing between coordinate and momentum space and propose a new coordinate space prescription which avoids this problem.

• Research Organization: Columbia Univ., New York, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: FG02-92ER40699
• OSTI ID: 1610194
• Journal Information: Nuclear Physics. A, Journal Name: Nuclear Physics. A Journal Issue: C Vol. 982; ISSN 0375-9474
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English