Transverse single-spin asymmetry in the low-virtuality leptoproduction of open charm as a probe of the gluon Sivers function
| Autor: | Anuradha Misra, Abhiram Kaushik, Rohini M. Godbole |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Particle physics Muon 010308 nuclear & particles physics media_common.quotation_subject High Energy Physics::Phenomenology FOS: Physical sciences Parton 01 natural sciences Asymmetry Upper and lower bounds Gluon Nuclear physics Transverse plane High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences High Energy Physics::Experiment Open charm 010306 general physics Nuclear Experiment media_common |
| Zdroj: | Physical Review |
| Popis: | We study the low-virtuality inclusive leptoproduction of open charm, $p^\uparrow l\rightarrow D^0+X$ as a probe of the gluon Sivers function. We perform the analysis in a generalised parton model framework. At leading order, this process is sensitive only to the gluon content of the proton. Hence any detection of a transverse single-spin asymmetry in this process would be clear indication of a non-zero gluon Sivers function (GSF). Considering COMPASS and a future Electron-Ion Collider (EIC), we present predictions for asymmetry using fits for the GSF available in literature. Predictions for peak asymmetry values lie in the range of 0.8\% to 13\%. We also present estimates of the upper bound on the asymmetry as obtained with a maximal gluon Sivers function. Further, for the case of the Electron-Ion Collider, we evaluate the asymmetry in the muons decaying from the $D$-meson and find that the asymmetry is well preserved in the kinematics of the muons. Peak values of the muon asymmetry are close to those obtained for the $D$-meson and lie in the range $0.75\%$ to 11\%. 24 pages, 8 figures, v4: To appear in Physical Review D. Added results for SSA in quasi-real photoproduction obtained using the QED result for the TMD distribution of photons in a lepton (from Phys. Rev. D 93, 013005, arXiv:1508.06964). Also added details of how the SSA in terms of $D$-mesons is converted into SSA in open-charm decay muons, using the narrow width approximation |
| Databáze: | OpenAIRE |
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