Single-Inclusive Production of Hadrons and Jets in Lepton-Nucleon Scattering at NLO

Abstract

We present next-to-leading order (NLO) perturbative-QCD calculations of the cross sections for $\ell N\to hX$ and $\ell N\to \mathrm{jet}X$. The main feature of these processes is that the scattered lepton is not observed, so that the hard scale that makes them perturbative is set by the transverse momentum of the hadron or jet. Kinematically, the two processes thus become direct analogs of single-inclusive production in hadronic collisions which, as has been pointed out in the literature, makes them promising tools for exploring transverse spin phenomena in QCD when the incident nucleon is transversely polarized. We find that the NLO corrections are sizable for the spin-averaged cross section. We also investigate in how far the scattering is dominated by the exchange of almost real (Weizsäcker-Williams) photons. We present numerical estimates of the cross sections for present-day fixed target experiments and for a possible future electron ion collider.

15 pages, 16 figures, v3: corrected numerical results, main conclusions of the paper remain valid

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Cited by in corpus (31)

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• Threshold Resummation for Polarized High-$p_T$ Hadron Production at COMPASS
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• Direct- and Resolved-Photon Threshold Resummation for Polarized High-$p_T$ Hadron Production at COMPASS