Fabio Gasparini
Single-spin asymmetries in p↑p → J/ψ+X within a TMD approach: role of the color octet mechanism
D’Alesio, Umberto;Pisano, Cristian;SANGEM, RAJESH
2019-01-01
Abstract
We calculate the transverse single-spin asymmetry (SSA) for J/ψ production in proton-proton collisions, within non-relativistic QCD, employing the transverse momentum dependent, generalized parton model, which includes both spin and intrinsic motion effects. In particular, we study the role of the color octet mechanism in accessing the gluon Sivers function. In doing that, we also show, within this approach, how the singularities coming from color octet terms in the low-PT region can be handled, leading to finite cross sections. Predictions for both unpolarized cross sections and SSAs are given and compared against PHENIX data. Estimates for LHCb in the fixed target mode are also presented.File | Size | Format | |
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ppjpsi NRQCD DAlesio2019_Article_Single-spinAsymmetriesInPUparr.pdf open access
Description: articolo principale
Type: versione editoriale
Size 826.66 kB
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826.66 kB | Adobe PDF | View/Open |
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